Possible cause list is identical. 41,000 miles. When I got home, I replaced coil pack #1, and then I replaced the other seven coil packs. so filled the last two full tanks with Chevron gas and gone through two bottles of Techron. How much can a repair cause? It depends on the cause. P0300 is a diagnostic trouble code (DTC) for "Random/Multiple Cylinder Misfire Detected". Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. The check engine light may also come on, with codes P0300, P0171 and PO174. anyone else seeing this problem? had it to the dealer 2 times and they cant come up w/ a reason for it. Interventions: The misfires do not follow the ignition coils when swapping with cylinders 1&2. This Prius came in making a loud rattle when the ICE started warm. Cylinder#6 misfire on a 2010 dodge caravan 4. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”. During the misfire event, all the data was fairly normal. Fixing P0301 should be a high priority. Random Multiple Cylinder Misfire p0300. Then I changed all 6 ignition coils and still got the 0301 code. Mileage may suffer as well when your Prius has P0302. I went ahead and cleared the codes to reset CEL. Does anyone have a list of causes of a random multiple cylinder misfire?if it helps at allit throws the code most frequently at prolonged idle periods and periods of driving where the same gear and rpm is maintainedin other wordsif i'm beating on it, the light wont come on. Cylinder 2 Misfire Detected. But most modern cars are equipped with catalytic converters in the exhaust system, and you may have ruined the converter, which may cost. Possible cause list is identical. The engine light was on, I read the code and it was P0301 (cylinder misfire detected). If the coil is weak/inop, then the cylinder is dead or weak, which means it's sister cylinder is dragging the weight of an unfired piston. But I can research the internet to learn more on how to do some of the above. PO304 Cylinder 4 misfiring. 29CC COMBUSTION FAILURE , MULTIPLE CYLINDERS DETECTED. There is a cheap possibility - it happened to our van on a 300M trip to Fredericksburg (wonderful place BTW) Ours said "P0302 - Misfire on Cylinder 2" So which cylinder is which?. Gotcha, the car had the misfire immediately after first start up. You can do the same test with the spark plug, i. JEEP WRANGLER So lost (multiple cylinder misfire) I dont know what to do. If the problem persist more tests needs to be done to diagnose problem, see "Possible Causes". The P0303 Toyota code means that the cylinder 3 is misfiring or is randomly misfiring. This could cost $300-$400 for a 4-cylinder engine or $450-$700 for a V6. 6 sohc started misfiring. I dont want to take it to a shop. so I had her come home and I plugged in my scan tool, and it threw 5 codes. I cleared the codes and nothing has come back yet, but it is still misfiring and tapping loudly, the plugs are ok, but are covered in fuel. It would start sometimes, and misfire the whole time I drove it, other times, I could drive it just fine. After replacing a stuck thermostat, I cleared the codes and only the #5 misfire is back. He has had to put in a new battery (battery died as soon as i arrived at the shop). Mileage may suffer as well when your Prius has P0302. It is mushroomed, grooved, and pitted (attached photo). The Malfunction Indicator Lamp (MIL) would also irregularly go on and off. For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only light when the misfire is detected on a second trip. If the cat is completely clogged your car won't even start. All internal engine parts including: pistons, piston rings, piston pins, crankshaft and main bearings, connecting rods and rod bearings, camshaft and camshaft bearings, timing chain and timing gears, intake and exhaust valves, valve springs, oil pump, push rods, rocker arms and shafts. Check engine light still comes on, cylinder mis-fire. In that case, start by checking fuel supply issues like poor fuel pressure caused … Read More. A misfire malfunction can be detected on any one cylinder or on multiple cylinders. The engine control unit can detect a misfire in some different ways, depending on what car model and engine you have. Hello all! I have a 2000 4. Toyota Prius check engine light keeps coming on. If you were to post the freeze frame data that go with it, maybe someone on this forum can make sense of it. The misfire was in the same cylinder beofre and after I replaced all of the basic parts. 2008 Silverado 5. 0 TSI) After a few worsening Codes thrown off into the VAG-COM stratosphere and reported to the Dealership:. Check Engine Light Code P0300 Random/Multiple Cylinder Misfire Detected. I just got it back yesterday, covered under 5/60,000 powertrain warranty. to isolate the root cause of the misfire. If you lose a spark, whether from lack of coil voltage or any other reason, this can also lead to a cylinder misfire. Anti-lock Brake Part Assembly. Also found both plugs fouled on the #4 cylinder. Pulled codes and got 0303: misfire in cylinder 3. I was getting specific cylinder misfires, and also multiple cylinder misfires, off and on. It would start sometimes, and misfire the whole time I drove it, other times, I could drive it just fine. A misfire malfunction can be detected on any one cylinder or on multiple cylinders. However, the problem is still there. It sounded AWEFUL. The fault could be a fouled or worn spark plug, fuel injector problem, vacuum leak at this cylinder or a mechanical problem within the cylinder (leaking intake or exhaust valve, carbon build-up, etc. 03 VW Passat with multiple random cylinder misfire. Car has a rough idle. Start by checking for intake leaks, intake gaskets are commonly caused of multi-cylinder misfiring. I just got it back yesterday, covered under 5/60,000 powertrain warranty. Theory: bad wires or bad coil pack: switched around wires expecting fault to move to a different cylinder, but didn't:so wires and coil pack are good. With and Without Misfire Codes. Peter Finn the Car Doctor 325,116 views. Could a cylinder misfire be caused by a bad plug?, a bad ignition wire?, a bad fuel injector?, or any of the above? Or something else?. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. relatively cheap part, just sucks getting to it if i remember correctly. Hi, I have a 2010 Escape 4 cyl with a cylinder 1 misfire code. If the frequency of misfire is high the Powertrain Control Module (PCM) may place the engine in "Limp-In" mode. You can do the same test with the spark plug, i. Yep, that misfire is most likely from the fuel vaporizing inside the #3 injector caused by heat from the exhaust header collecting in that area. 2012 - 2013 Camaro Cam & Lifter Issue. These can be checked by swapping the ignition coils to different cylinders to determine if the misfire moves. Code reader shows P0303, misfire in cylinder 3. I went ahead and cleared the codes to reset CEL. 4500 miles, and had the P0300 Cylinder misfire code 2 times now. Because of that MIL (malfunction indicator lamp) will start flashing and engine must be shut off immediately at this moment. You have a choice of Platinum (NGK PLFR55A-11 @ $1 ea. The average cost for a Toyota Prius ignition coil replacement is between $572 and $871. Labor costs are estimated between $104 and $132 while parts are priced between $468 and $739. Possible causes of OBD code P0302 Toyota A code P0302 Toyota may mean that one or more of the following has happened: Faulty spark plug or wire Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector Burned exhaust valve Faulty catalytic converter(s) Running out of fuel Poor compression Defective computer. P0303 means a misfire on cylinder 3, and so on. These engines are designed to run lean, and an occasional misfire is common. 2010 Tundra TRD OR C/M 5. 2010 prius 2. Once inside the comfortable Three Touring cabin, you'll see impressive cargo capacity, intuitive design and multiple displays that help you to monitor your car's remarkable efficiency. If the Engine System has a Misfire Counter for specific cylinders on the Scan Tool Data Stream, pay very close attention to the cylinders(s) named in the misfire code(s). A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. Hey PC, my 2010 prius has 192k miles and has an intermittent misfire. Loss of compression means a cylinder isn't getting the right amount of air/fuel mixture before it can be ignited. I read it and it was a P0300 Random/Multiple Misfire. We thought that might take care of the check engine light but it came on again so we Changed the spark plugs. The codes meant cylinder 1 & 3 misfire. Coasted to the side of the road and restarted/rebooted car. Toyota Prius P0302 Definition. I went ahead and cleared the codes to reset CEL. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. , move cylinder 4 plug to say cylinder 2 and if the misfire is now P0302 then the plugs are at fault. 1996 GMC Yukon 5. P0300, P0301, P0302, P0303, P0304. While driving home, the whole vehicle started to shake violently, and the engine light came on (flashing). What else can it be? Reply 1: Which engine. The check engine light may also come on, with codes P0300, P0171 and PO174. It's been a problem car for a while but i've fixed all it's glitches except this one. The number one cylinder is on the right side bank of cylinders (firewall side) and it at the front of the engine by the serpentine belt. Loss of compression means a cylinder isn't getting the right amount of air/fuel mixture before it can be ignited. 0 4X4 with 170K miles. In short I have plugged in a diagnostic (Launch X431) and it shows up Misfire cylinder 7 and Multiple engine misfire. If you see a value above zero for one or more cylinders, it's probably worth doing some more thorough checks on the coil, spark plug, injector, gaskets, or compression that corresponds to that particular cylinder. How much can a repair cause? It depends on the cause. I have replaced all four coils and all four spark plugs. The AutoTap reported Diagnostic Trouble Codes (DTC’s) of P0300 (engine misfire) and P0301 (misfire detected in cylinder #1). Not sure where to go from here. I could change the plugs completely of course, but that may not cure anything and I have a hunch it will do precisely nowt. Feb 12, 2010. Lucky you it's only #1 it seems. Another Prius with misfire problem My Prius had the check engine light come on - and it had set 5 codes: each cylinder misfire, plus random cylinder misfire. Misfire - Not Coilpack or plugs, HELP needed. How much can a repair cause? It depends on the cause. 0 Turbo 2017 FK6 Apparently 3 days ago on my way to work, I got flashing Check Engine Light (CEL) and car started stalling a bit. P0300 is for multiple cylinder misfire and is likely due to usage of non-OEM plugs. If the misfire follows the suspected coil, the failure will lie with the coil rather than the spark plug or PCM's coil driver. I have a 2006 Cadillac CTS with 85k miles. DTC Detection Conditions. The engine computer or PCM can detect a misfiring cylinder by monitoring the engine speed. P0303 means a misfire on cylinder 3, and so on. The plastic caps are for aerodynamics and appearance. this car came in poor idling. The cam lobe on exhaust #1 looked like garbage. Basics Causes of a Misfire Condition. The number one cylinder is on the right side bank of cylinders (firewall side) and it at the front of the engine by the serpentine belt. ) or Iridium (LFR5AIX-11 @ $8 ea. One cylinder can misfire or more than one cylinder can Misfire depending on the situation. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 2. I have a 2006 Cadillac CTS with 85k miles. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 3. "Check engine light is on and flashing. I was getting specific cylinder misfires, and also multiple cylinder misfires, off and on. Took it on a long trip, ~300 miles, usually ran fine, and got 28 mpg hwy, but idled rough a couple times, nothing major, no more blinking CEL. The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. If there is not a Cylinder Misfire Counter, then you might have to switch components—such as coils, spark plugs, etc. I have had this problem since I bought the car 2 years ago and have yet to find a remedy for it. I was getting P0300 & P0305 misfire codes. Car is misfiring. I had my brother read the code, which stated I had a cylinder 2 misfire. As I last left you fine gentleman I had a misfire on cylinder #3 so I did the logical thing. 0L V6 might record various misfire codes. You can do the same test with the spark plug, i. One cylinder can misfire or more than one cylinder can Misfire depending on the situation. A good cylinder will show a relatively clean line with little hash. Took it to a friend at a dealer and it was the dreaded P0300 code, misfires on #1, 8 and 5 but I did not feel the misfires the light just st. QUOTE (cmayo313 @ Jun 20 2010, 09:02 PM) Unfortunately my phone is broken and I'm still waiting for the new one to arrive. Driving with a misfire can damage that catalytic converter, and raw fuel will pass through the cylinder into the exhaust. 6 firing order : and click the images tab on top of the page. I have also had an exhaust valve seating problem show up after a hard, hot drive. BMW E90 Misfire and Engine Management Light Illuminated By Damien Coleman A 2008 BMW E90 with a 2. As mentioned, a cylinder misfire can happen due to a few reasons, and to make things simple, we created a table to show you exactly what repairs may be required to fix the misfire condition. Step 1 - There are several combinations of misfire conditions, steady or random, at idle or under power, which may or may not be detected by the computer and trigger a check engine or service engine soon light, read trouble codes to help pinpoint the cylinder(s) in question and follow the repair guide below. as a cylinder 8 and random misfire. It appears that the real culprit is the direct injection of gas into the cylinder so the. thankfully an exit off fwy and a gas station within coasting. I have a 2006 Cadillac CTS with 85k miles. Well im having the same problem with my 07nnbs sierra just started doing the same thing last saturday but im getting a p0307 misfire and service stabilitrak-traction control i already did plugs and wires also swap coils from #5 to #7 still acting the same. Car is misfiring. Get up-to-date recall information for Toyota vehicles, including information on class action lawsuits, affected models, false advertisement, and more. In that case, start by checking fuel supply issues like poor fuel pressure caused … Read More. If you see a value above zero for one or more cylinders, it's probably worth doing some more thorough checks on the coil, spark plug, injector, gaskets, or compression that corresponds to that particular cylinder. Acceleration made it worse. D2 V8 I changed the spark plugs over yesterday and Hawkeye is telling me there is a misfire in cylinder 3. Same code, same cylinder. How much does a cylinder misfire repair cost?. check monitor number 3 and 6 misfire. Toyota Prius P0302 Definition P0302 is a cylinder specific misfire code, which means that cylinder 2 is misfiring and causing the code. The scan tool showed the following 4 codes stored: P0300-Random/Multiple Cylinder Misfire Detected; P0301-Cylinder 1 Misfire Detected; P0303-Cylinder 3 Misfire Detected and P0305-Cylinder 5 Misfire Detected. Hello fellow members, I am having an issue with my 2001 Saab 9-5 2. The number one cylinder is on the right side bank of cylinders (firewall side) and it at the front of the engine by the serpentine belt. 7 hemi my check engine light is on and computer says random multiple misfire code is thrown so I changed the plugs, wires and coil packs which were all still stock so they needed changed but didn't fix the problem. This ignition coil pack sits on top of the valve cover. If the vehicle is equipped with On-Board Diagnostic (OBD), a MIL illumination may also have occurred due to Diagnostic Trouble Code (DTC) P0300 - Multiple Cylinder Misfire. now once again I have a multiple misfires. I already checked everything from coils, plugs, to even doing a compression test along with seafoam to fuel system cleaning. Definitely not coils. Page 1 of 3: How to Troubleshoot a Misfire (GM 4. Once it sits for a few minutes, its fine again. I stopped at advance auto and they wrote down the codes for me. First, if you’re getting a P0300 Random/Multiple Cylinder Misfire Detected code, that would indicate a universal problem that applies to all cylinders. Good Morning Gentleman. PO300 Random/multiple cylinders misfiring. I've been to a few aveo forums and seen a lot of threads concerning misfires and such. So, I got an 05 Aveo recently with a busted timing belt. Hi all, (misfire) and P0302 (cylinder 2) So, coil pack or plugs you would think, but they have both been swapped. You have a choice of Platinum (NGK PLFR55A-11 @ $1 ea. However, the problem is still there. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. Typically, fuel mileage will suffer as well. I don't have the tools or experience to check the valves or vaccuum. Hi, I have a ML320 2000 with 165K miles. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. Yep, that misfire is most likely from the fuel vaporizing inside the #3 injector caused by heat from the exhaust header collecting in that area. Hey guys, I have a 2006 Charger SXT 3. I've been to a few aveo forums and seen a lot of threads concerning misfires and such. Check engine light and trouble code P0300 misfire. This is the same side that is mentioned in the Chrysler recall for cylinder head replacement, and it's the same cylinder head that was replaced at 28,000 miles. The other 4 times out of 5 it runs smooth from idle to 2500rpm it runs like new. If the engine speed fluctuates enough to cause the Crankshaft Position sensor signal to vary, the Engine Control Module can determine that a misfire is occurring. An update on my LQ9 random misfire on cylinder #1. Peter Finn the Car Doctor 325,116 views. I had the same problem with my '04 aveo and finally figured it out!!! I got the run-around from 4 places before somebody diagnosed it right. The Problem: I drive a 2002 Toyota Camry 4-cylinder that I bought used in November. Although generic, the specific repair steps may vary depending on make/model. Toyota Prius Brake Master Cylinder Replacement costs between $316 and $4912 on average. The plastic caps are for aerodynamics and appearance. I had the spark plugs changed about a month ago so it shouldn't be any problems with them. Firing order on this engine is 1-6-5-4-3-2. We don’t know the cause of the misfire at this point, but we know cylinder 3 needs to be checked. I could change the plugs completely of course, but that may not cure anything and I have a hunch it will do precisely nowt. Something else to look at in the spark burn line is the amount of “hash” it contains. anyone else seeing this problem? had it to the dealer 2 times and they cant come up w/ a reason for it. Start by checking for intake leaks, intake gaskets are commonly caused of multi-cylinder misfiring. In my lengthy internet travels to an attempt to educate myself, I have found multiple forums with several posts around this same issue. Im getting multiple cylinder misfire code In every cyldiner. All internal engine parts including: pistons, piston rings, piston pins, crankshaft and main bearings, connecting rods and rod bearings, camshaft and camshaft bearings, timing chain and timing gears, intake and exhaust valves, valve springs, oil pump, push rods, rocker arms and shafts. A P0302 code, for example, would tell you cylinder number two is misfiring. All the low compression motors I've worked on before had white smoke at idle or cold but it always changed to black smoke/high egts at full throttle. Depending on how long it was misfiring for, it probably wouldn't be a bad idea to throw a set of plugs in it. “A P0300 diagnostic code indicates a random or multiple misfire. Cylinder 2 Misfire / P0302 on a 2007 JK I rolled down my window and the sound was definitely not right. I have a 2010 dodge nitro that is showing the code for cylinder 6 misfire as well. When the engine misfires, you will lose power, your gas mileage will drop and the vehicle can even fail emissions. First, if you're getting a P0300 Random/Multiple Cylinder Misfire Detected code, that would indicate a universal problem that applies to all. What else can it be? Reply 1: Which engine. Here's a quick explanation of how a pro would attack the problem. PO300 Random/multiple cylinders misfiring. I replaced all 4 spark plugs. There is a cheap possibility - it happened to our van on a 300M trip to Fredericksburg (wonderful place BTW) Ours said "P0302 - Misfire on Cylinder 2" So which cylinder is which?. Possible causes of OBD code P0303 Toyota A code P0303 Toyota may mean that one or more of the following has happened: Faulty spark plug or wire Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector Burned exhaust valve Faulty catalytic converter(s) Running out of fuel Poor compression Defective computer. Ran diagnostics and found codes P0304 P1414 for cyl 4 misfire and cyl 4 reactivation control performance. The fault could be a fouled or worn spark plug, fuel injector problem, vacuum leak at this cylinder or a mechanical problem within the cylinder (leaking intake or exhaust valve, carbon build-up, etc. I am getting misfire CEL for cylinder 2 and 5, sometime just cylinder 2 by itself but with multiple cylinder misfire followed with specific cylinder misfire everytime. If you lose a spark, whether from lack of coil voltage or any other reason, this can also lead to a cylinder misfire. Here’s a quick explanation of how a pro would attack the problem. Every few months or so, my CEL comes on when I cold start my car, and the scanner reads P0300 (random cylinder misfire) and one or all of the codes P0301-P0306 (Cylinder Misfire 1-6). Car is misfiring. The car would barely run so I replaced the plugs with oem ngks. it stoped for a day and came back. The problem is to find out which coil (s) is the bad one, most Nissan vehicle owner replaced all six coils at the same time. Bad or damaged spark plugs can prevent sparks from occurring. The symptoms are just like I've experienced on outboard motors when I've had a coil go bad--intermittant misfire and then within a few days it gets worse to where it totally fails. , move cylinder 4 plug to say cylinder 2 and if the misfire is now P0302 then the plugs are at fault. So then I changed the fuel injector for that cylinder 1. A P0302 code, for example, would tell you cylinder number two is misfiring. A code reader, available from parts stores, will permit you to jack into the engine-control unit (ECU) and get a dialog of what’s up, what’s wrong and where it’s happening. Engine misfire is a severe condition that requires immediate attention to avoid expensive repairs. I went ahead and cleared the codes to reset CEL. It's been replaced and replaced and replaced, and it's getting pricey. The codes are P0300 (Random/multiple cylinder misfire), P0303 (Misfire cylinder 3), and P0304 (Misfire cylinder 4). This Prius came in making a loud rattle when the ICE started warm. Misfire cylinder 4 P0304 solved by replacing valve stem seals The family 2004 Honda Civic, a car in 90 miles per day commute service, with 254,000 miles on the odometer has finally stopped showing the check engine light with "misfire on cylinder 4" P0304 scan code readings. The engine computer or PCM can detect a misfiring cylinder by monitoring the engine speed. Had is scanned at Advanced, and they said it was a "Random Misfire. Number six is diagonal to number one. Use an engine scan tool to help isolate the problem cylinder and likely cause of the misfire. to isolate the root cause of the misfire. car is not driven hard. I had the plugs changed at 50K as recommended. Have the injectors professional cleaned or at least run several bottles of a good injector cleaner through the gas tank. The EGR Valve was. 3l under 70,000kms / 45,000miles last fall we started to have some trouble with rough idle then the check engine light came on. All the low compression motors I've worked on before had white smoke at idle or cold but it always changed to black smoke/high egts at full throttle. I have a 2010 dodge nitro that is showing the code for cylinder 6 misfire as well. Gen 2 Toyota Prius engine sputter misfire engine running rough CEL light on P000 P0300 P0304 2012 Prius - CEL P0301 Cylinder 1 misfire/Engine knocking - FIXED - Duration: 16:15. Replaced the #2 MDS solenoid, The wiring. This could cost $300-$400 for a 4-cylinder engine or $450-$700 for a V6. I've had the same thing in my '13 WRX although my code was P0300 Random/Multiple Cylinder Misfire. All I have to work with is a code for cylinder 2 misfire. When Monitored: Any time the engine is running and the adaptive numerator has been successfully updated. It sounded AWEFUL. People ask me about misfire codes after they've replaced all the spark plug wires, coil, and plugs and they still have the code. The loss of 25% of the engine's power output is the equivalent of a horse trying to run on three legs. Under hard acceleration I immediately get a CEL with strong bucking of the engine and the A/C stops blowing cold. This is true of most vehicles of that era. Please do feel free to post your own resolution to misfire problems though in this thread. Check engine light still comes on, cylinder mis-fire. Another Prius with misfire problem My Prius had the check engine light come on - and it had set 5 codes: each cylinder misfire, plus random cylinder misfire. The faults for bad ignition coils could be misfires on a single or multiple cylinders with possible fault codes being P0300, P0301(for cylinder 1), P0302(for cylinder 2) , P0303(for cylinder 3), P0304(for cylinder 4). Driving with a misfire can damage that catalytic converter. The average cost for a Toyota Prius ignition coil replacement is between $572 and $871. The engine computer or PCM can detect a misfiring cylinder by monitoring the engine speed. Car is misfiring. Check Engine Light Code P0300 Random/Multiple Cylinder Misfire Detected. Your mechanic is correct the P0300 code is set when there is a multiple misfire, without knowing the cause, but the P1320 is more specific to the ignition coils. P0301- Misfire detected on cylinder 1 P0304- Misfire detected on cylinder 4 P0302- Misfire detected on cylinder 2 P0303- Misfire detected on cylinder 3 (80% of the misfire is logged on this cylinder) can anyone help me or point me in the right direction of why all 4 would be misfiring, the misfire does not cause any sort of loss in power or. Ok, then like I say above, more testing will be needed to find the root of the misfire. I've read about two possibilities: bad gas and bad coil. Driving with a misfire can damage that catalytic converter, and raw fuel will pass through the cylinder into the exhaust. I have 97 Honda CRV with 173K miles on it. code p 300 random misfre. I replaced all the plugs with NFL and also s new coil pack for cylinder 6 and after 3 or 4 days it will reappear. Audi A4 Running Rough P0171 P0507 P2279 & Multiple Cylinder Misfire Diagnosing and Repairing Audi A4 Fault Codes. If your catalytic converter is clogged you will notice a drastic drop in fuel efficiency and real struggle getting your Mercedes to accelerate. Toyota Prius P0301 Definition. but accelerate is fine no misfire. Abs For Sale. If the misfire follows the suspected coil, the failure will lie with the coil rather than the spark plug or PCM’s coil driver. Raw fuel is also passing through the cylinder into the exhaust. The PCM tries to determine the cylinder that is misfiring by the sudden slowing of engine RPM and then guessing which cylinder it must have been due to crank sensor position. The misfire data will show which cylinder or cylinders are misfiring. Misfire on multiple cylinders. If battery voltage exists and a COP assembly is suspected of causing an intermittent cylinder misfire, the quickest diagnostic procedure is to switch the coil from cylinder to cylinder. The fix for that is to wrap a piece of insulation around the #3 injector and zip tie it into place which fixed my #3 misfire. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”. It would start sometimes, and misfire the whole time I drove it, other times, I could drive it just fine. Here is a hint. According to the scan tool, cylinder 4 is misfiring the most, with cylinder 3 having some as well (about 5:1 ratio cylinder 4 to 3). Any advice of what to do to tell if it is the coil?. Sometimes the computer can identify which cylinder is misfiring, but more often in these cases there are multiple cylinders misfiring (you'll see why later in this post) or it is too difficult for the computer to tell. About 2 month ago I got Check ingine light on with couple of codes such as System to Lean bank1, Multiple misfire, Cylinder 1 misfire and Cylinder 2 misfire. How much can a repair cause? It depends on the cause. The previous technician replaced all the coils and plugs and ran a compression test. I purchased the truck with a misfire problem and the previous owner has replaced the following: TPS, Idle air control, Cam position sensor, Crank position sensor, COP for cylinder 1 (showed a code before) and spark plugs When I start the truck I have to give. An update on my LQ9 random misfire on cylinder #1. The average cost for a Toyota Prius ignition coil replacement is between $572 and $871. I have had this problem since I bought the car 2 years ago and have yet to find a remedy for it. I have a 2003 Honda pilot exl with 198k miles. The ECM counts the number of times the engine speed change rate. The 2010 Volkswagen CC has 3 problems reported for severe engine misfire. , move cylinder 2 plugs to say cylinder 3 and if the misfire is now P0303 then the plugs are at fault. to isolate the root cause of the misfire. "P0300B" means random multiple misfire. This means that the ability to write new posts and access various member features will go away. This is the product called for in the Mopar TSB that fixes that problem. - P0300: Random/Multiple Cylinder Misfire Detecte It was issued in September. Hi all, Need help for a 2009 LT1 traverse-I was getting a misfire in cylinder 3 so I changed coil and spark plug and the issue jumped to cylinder 4. as a cylinder 8 and random misfire. The other 4 times out of 5 it runs smooth from idle to 2500rpm it runs like new.