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Questions tagged [misfire]

A condition where one or more engine cylinders experiences lack of combustion or mistimed combustion through detonation

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1 answer
12k views

Engine misfire only when car is hot

I have honda civic 2011, now it works fine when cold startup and dont give much issues other then when I "accelerate a lot" and having done that for a while, the car starts misfiring. Now ...
1 vote
3 answers
114 views

2000 Honda Accord misfires only some of the time. What is causing this?

It has a very odd pattern for when it misfires. You start it at the beginning of the day and it works perfectly. You drive it around, turn it off, let it sit for 30 minutes, start it again, and you ...
0 votes
2 answers
128 views

Can i drive my 2016 Jeep Grand Cherokee 100 miles to a mechanic with a misfiring cylinder?

My 2016 Jeep Grand Cherokee started hesitating when accelerating, but only after the engine warms up. The testing tool says it's a cylinder 2 misfire. The mechanic I want to take it to is 100 miles ...
0 votes
1 answer
212 views

I have a 2012 Chevrolet Camaro 2lt with a lot of problems

I have a 2012 Chevrolet Camaro RS and I'm getting a cylinder 6 misfire. I swapped the spark plugs because they were burnt, but I'm still getting a cylinder 6 misfire. I even checked the coil packs. ...
1 vote
1 answer
30 views

Engine misfire, low gas mileage, click when gear change

I got a tune up, radiator and radiator hose, serpentine belt, starter and wheel bearing fixed. The misfiring, bad mileage and clicking noise didn’t start until after the tune up. What could be wrong? ...
1 vote
0 answers
25 views

How to electrically test Diamond FK0140 coil packs?

I have rust on my Subaru's coil on plug packs so thought to test resistance of the primary and secondary windings for all 6 coils to check for any inconsistencies. These are the Diamond FK0140 with a ...
1 vote
3 answers
195 views

2013/Toyota/Corolla S: Check Engine (with codes), Rough Idle, Inconsistent temp. What am I missing?

As title states: 2013 Toyota Corolla S Had the check engine light come on just around a month ago and started idling rough. Pulled codes: P0301 (cylinder 1 has a misfire) and P219A (air to fuel ratio ...
1 vote
1 answer
1k views

P0300 code (random misfire, all cylinders) but only after cold start

The past couple of times I've started my car for the first time in the day, I've had a problem with the engine running rough and sputtering, and being really down on power alongside a P0300 code ...
0 votes
0 answers
13 views

Same side multiple misfire jeep liberty 3.7 troubleshoot

All three cylinders misfire at the same time on the same side. What’s the reasoning?
0 votes
1 answer
147 views

Engine cylinder 5 misfire

On my Mitsubishi shogun sport van 2002 3.0L V6, There was a slight misfire on cylinder 5. We replaced spark plugs, all the HT leads (Ignition wires) and Ignition coils (all 3). That didn't solve our ...
2 votes
1 answer
1k views

2006 Buick LaCrosse misfire - Replaced coil pack, new plugs, new wires, 2x junkyard ICM. Still no luck

I have a 2006 Buick LaCrosse 3.8L that is misfiring. There is a strong smell of gas when running. I have had this issue before and it was solved by replacing the ignition control module. I also ...
0 votes
1 answer
92 views

Misfire at idle

I have a 97 Montero sport with 2.5k miles on the engine(it’s remanufactured). I’ve been chasing a p0305 for 2 years but can’t find the problem. I know I have a possible vacuum leak since the fuel ...
0 votes
1 answer
632 views

Ford Ranger low RPM misfire?

2000 Ford Ranger 3.0L 2WD. I'm having a tough time figuring out if it's trans shudder or a misfire but leaning towards misfire at this point. The rumbling really starts to happen during converter ...
0 votes
1 answer
454 views

Is my exhaust causing misfire or did misfire burn the exhaust?

I hope to not be too vague as I don't know a lot about cars. I recently purchased a 1.2L Fiat Punto II 2005. It has trouble with a rough idle, a power drop off around 4krpm when accelerating and a ...
1 vote
1 answer
584 views

Misfiring cylinder - does the ECM disable it?

I have a misfiring cylinder on my 2009 Ford Ranger 2.3L 4 cylinder engine. I'll leave diagnosing the cause of the misfire to another thread, but I suspect it's related to retapping one of the spark ...
3 votes
1 answer
9k views

Misfire in cyl 7 on 2007 Suburban 1500 4x4 with 5.3 L flex fuel LTZ

2007 Suburban 1500 4x4 with 5.3 L flex fuel LTZ 267,000+ miles. Having trouble with running rough and misfire. The ODB II indicates P0307. Checked wires - replaced though nothing is wrong, no ...
0 votes
2 answers
618 views

2005 Subaru Legacy Cylinder 3 misfire

My Wife's Subaru's check engine light recently came on, when we went to auto zone to check the code it came back as a cylinder 3 misfire, we went to our mechanic and he changed the sparkplugs, but ...
0 votes
0 answers
29 views

Engine misfires in drive at a stop but not in park

Why would my 4-cylinder 1999 Toyota Camry misfire in drive but not in park at a stop? It is not a constant skip just sometimes in drive. It is not getting worse maybe very very gradually. I am sure ...
0 votes
1 answer
219 views

Engine misfire and poor mileage

My 2015 Chevy Suburban has 180k miles and now it gave me a check engine light code with a misfire. It shakes a little bit and does not give good fuel mileage. Also, the reader on the speedometer use ...
1 vote
1 answer
2k views

Misfire on Cyl 2 & 3, but doesn't (exactly) match TSB

2009 Honda Accord I found a TSB on a similar issue: TSB 09-050 My car exhibits the same symptoms others have had relating to the TSB, EXCEPT I only have the misfire codes: DTCsP0302 and P0303, but I'...
1 vote
1 answer
52 views

Will fixing first OBD2 misfire codes resolve the cascade of others downstream?

Looking at a car my kid wants to buy. 2012 Honda Civic LX. One owner, some service records, seemed to run fine in test drive. No colored exhaust gasses, no dashboard lights, sped on freeway, sudden ...
0 votes
0 answers
24 views

Coolant leak / engine overheat / cylinder misfire

Make: Honda Model: Civic 1.8L 2007 petrol Miles: 107,000 I have experienced cold air coming from heating system for a while - I probably should have addressed this sooner. Finally when driving ...
1 vote
1 answer
124 views

P3431 P0304 but engine does not feature cylinder deactivation?

2010 Dodge Grand caravan 3.8L (I think) CEL light came on and codes pulled were p0304 p0300 and p3431 , I'm curious as to what's up with the p3431. Looking it up on the typical obd sites say that it'...
0 votes
0 answers
45 views

Can't diagnose consistent misfire 2005 Chevy Malibu

My 2005 Chevy Malibu has a misfire on cylinder 3. The symptoms are: Shaking at idle Knocking sounds as I accelerate, but only under load (sounds fine if I rev it up in neutral) P0303 engine code ...
-1 votes
2 answers
2k views

Misfire and loss of power at between 2800 and 4000 RPM

First I need to start off by saying that NO Check Engine codes are thrown by this issue. Car is a 2007 Mazda CX-7 turbo, non-awd. What's happening: This can be broken down into 2 section really, a ...
-1 votes
2 answers
376 views

I have at least 3 misfiring cylinders on my 2012 Corolla

I have a code reader and it told me cylinders 1, 2, and 3 are misfiring. I also have and older battery and have been told it needs replaced because its low voltage. I have also been told I need a ...
1 vote
1 answer
223 views

Misfire issue on a 2014 Infiniti QX 60

I have some issues with a 2014 Infiniti QX60 (3.5 V6) that the car repair show is unable to find. I have a misfire code P0300 (random misfire detected). Here are the issues with the car: Car is ...
1 vote
0 answers
65 views

Will alien component found in new engine tear down effect valve behaviour?

OMG, I might have found the cause of a misfire in cylinder 1 that has been the bain of my life on and off for 3 years. I have a 1979 sherpa van with an austin/leyland "o" series engine. The ...
2 votes
1 answer
372 views

Is it possible to have a good looking spark but but still not suitable for ignition?

I have a misfire on cylinder 1 unyet i have 4 great sparks with ignition timing and valve timing checked. I'm clutching at straws i know, but is it possible to have a long reaching spark bridging 20mm ...
0 votes
0 answers
32 views

Is it possible to test an exhaust system for a restriction without dismantling it?

I've had an overheating problem with a new/other engine (1991) for 3 years now. Some time back I discovered that there was a misfire on cylinder 1 and maybe an intermittent misfire on cylinder 4. I've ...
1 vote
0 answers
658 views

Misfire! Does good compression mean there are no valve issues?

I have a new old stock sherpa "O" series petrol engine 1991 that I installed 3 years ago. I have a misfire on cylinder 1 (detaching spark plug lead makes virtually no difference to the ...
1 vote
0 answers
33 views

1984 Lincoln Town Car EEV-IV Bucking

I am working on a 1984 Lincoln Town Car with EEV-IV throttle body injection. The car is entirely stock and extremely well taken care of, with all original systems on the car (air injection, EGR, cats)....
2 votes
1 answer
74 views

The arm of my sparkplug somehow broke how concerned should I be?

I was driving my 2009 Toyota Corolla Ce on the highway today when my check engine light began flashing. So I got it towed back to my house for my grandpa to take a look at. He used a code reader to ...
1 vote
1 answer
276 views

Elusive cause to a lumpy idle

Having been around cars for a long time, this has me stumped. 2005 Renault Megane Estate with 1.4 K4J engine. Approx 125 000 km. Engine is restless at idle. Revs are unstable and feels like misfiring. ...
0 votes
0 answers
38 views

Spark plugs 3 and 5 wearing out faster

Two of my spark plugs in my 2013 Town and Country are wearing out much faster than the other four plugs. I have changed the coils for 3 and 5, I have also changed the cam shaft sensor. When those two ...
1 vote
0 answers
215 views

Toyota Avalon Crank but won't start

Please, how can I fix this pending problem? Recently, a client called me to fix his 2000 Toyota Avalon car that cranked but wasn't starting. From the onset, the car experienced several mechanical, as ...
1 vote
0 answers
46 views

P0302 persists after fuel treatment, new spark plugs, and swapped ignition coils

Problem: P0302 Vehicle: 2011 Mazda CX-7 Steps taken so far: Replaced spark plugs Swapped coil packs to see if the misfire would move to another cylinder Added fuel treatment The car had an extremely ...
6 votes
1 answer
1k views

Should misfire counts be zero?

'07 Cobalt LS, 2.2 L I-4 Car is not getting a misfire code. (p030x) However, the mode 6 data shows Non-zero "misfire counts" on all cylinders. The counts are single- or double-digits, and ...
0 votes
0 answers
99 views

Cylinder 3 misfire after thermostat replacement valve

I have 2003 Ford Expedition that had the heater not working because my thermostat was broken open. I then got a code to replace the thermostat. I need to take a long drive so I took it to a shop to ...
0 votes
1 answer
267 views

what causes a sienna to keep fouling spark plugs (misfire cylinder)

2005 Sienna, I occasionally get a p0304 (misfire cylinder 4) and engine runs rough. I found if I replace or clean the spark plug in cylinder 4, it goes away. For awhile. Then if I look in there, ...
21 votes
4 answers
25k views

How does the car's ECU detect a misfire?

I was wondering what the specific mechanism used by car ECU's to detect misfires is, or are if there is more than one method.
1 vote
1 answer
74 views

Can I disable a cylinder on my 2009 Ford Ranger?

This is sort of a hypothetical at this point - I have a misfiring cylinder on my 2009 Ford Ranger 2.3L 4 cylinder engine. I'm trying to diagnose it, but am sort of preparing myself for the possibility ...
1 vote
1 answer
242 views

Spark plugs black soot Virago 250 - came back after cleaning and adjustment

My Virago 250 was running very unevenly, losing power, surging etc. I took out the spark plugs and saw the electrodes were covered in soot. I thoroughly cleaned the plug tips with a wire brush, ran ...
0 votes
1 answer
746 views

Engine chugging while idle, misfires when accelerating and loss of power

When I was driving my Peugeot 407 petrol I suddenly experienced a loss of power. Luckily I was close to home and was able to drive the few meters back. When I started the car again the engine was ...
1 vote
0 answers
36 views

Misfire still happening after a lot of diagnostic - Mechanic stumped

I have a 2014 Town and Country that has been at garage for 5 weeks now. It has a misfire issue on cylinder#2 at low idle (under 800RPM) Mechanic is stumped by this issue, as he states mechanically ...
6 votes
2 answers
10k views

08 Silverado 5.3 rough idle and dark cold start exhaust

I recently bought a 2008 Silverado 5.3 with 77k on it. After a couple weeks I noticed that at idle the engine would stumble and my rpms would drop slightly. It eventually set off the check engine ...
0 votes
0 answers
98 views

1996 Toyota Tacoma Random Misfire

I have a 96 2.4l tacoma that has right under 200,000 miles on it. Most of the time it runs great but randomly it starts misfiring. Only when it's up to operating temp but besides that there's no rhyme ...
0 votes
0 answers
20 views

1993 Cavalier 2.2 misfiring

My 1993 Cavalier 2.2 is misfiring on the #3 cylinder. A check of the spark plug showed a dry plug but still had spark. Ceramic was cracked so I replaced all four. Thinking the injector was bad, I ...
3 votes
2 answers
37k views

Corsa D Stuttering Accelaration with Malfunction Light flashing

I have a 1.2l Vauxhall Corsa D (62 plate) that has done 63K miles. A problem has developed over the last day or two that is becoming a concern, and has got worse over the last 24 hours. Whilst ...
1 vote
0 answers
24 views

Car runs great until shut off then runs bad until shut off again

2008 dodge Avenger 3.5L 140,000 miles. Car runs great for however long I’ll run it for, until I shut it off for 5 to 15 minutes after it’s up to temp, then if I start it, it runs like shit, Has a ...

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