Skip to main content

Questions tagged [misfire]

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

Filter by
Sorted by
Tagged with
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.
Robert S. Barnes's user avatar
12 votes
2 answers
4k views

Can (possible) exhaust system damage cause random misfires?

2001 Honda Prelude SH. About three weeks ago while travelling 10-15 mph I pulled off the side of a dirt road to park and it turns out there was a row of a few railroad ties laying in the grass there....
Jason C's user avatar
  • 4,890
9 votes
1 answer
858 views

Do these coil on plug waveforms suggest I have a bad engine controller?

I have a missfire on cylinder 3. I have swapped the coil from cylinder 6 and 3, but the missfire remains on cylinder 3. I have also done the following: - replaced all spark plugs. - checked the ...
Rick Gostlin's user avatar
8 votes
2 answers
21k views

How does low oil level cause misfires or VTEC malfunctions?

So a few days ago my 2003 Honda Civic EX started misfiring while accelerating, especially with the A/C turned on, making popping noises, and then yesterday got a P1259 "VTEC system malfunction code". ...
endolith's user avatar
  • 1,351
8 votes
3 answers
17k views

Astra MK6 - when warm, rough idle and shudders while accelerating

Here's a video: https://youtu.be/wYyaW9wRt6U For a couple of months now my car has had a rough idle and shudders while accelerating - Vauxhall Astra J Exclusiv MK6, 4 years old 61k miles spark plugs ...
codaamok's user avatar
  • 181
8 votes
2 answers
391 views

Cylinder misfire after leak down test

I am getting cylinder misfire OBDII error codes after performing a cylinder leakdown test. During the test, I was turning the crankshaft to reach TDC for each cylinder and I'm now thinking whether it ...
amphibient's user avatar
  • 6,663
8 votes
1 answer
257 views

04 GMC Savanna G2500 4.8 V8 No Power

First time I looked at this the A/C compressor clutch wasn't engaging. Long story short: the high side pressure switch on the back of the compressor was unplugged. Noted that the engine was shaking (...
Ben's user avatar
  • 10.7k
7 votes
3 answers
23k views

Cause of limp mode in Vauxhall Astra which ECU code is relevant?

The engine now runs ok when started cold, but if the weather is very hot or it's started when warm it goes into limp mode, whereby the orange spanner symbol comes on and max acceleration is only 1/3 ...
BrianTheTallOne's user avatar
7 votes
4 answers
40k views

The Mystery of the Misfiring MINI

It's me again. 2008 MINI Cooper S w/ dealer-installed JCW package (chip tune, larger air intake, larger cat-back exhaust). I thought everything was fine after resetting my ECU last week, but had bad ...
Spivonious's user avatar
7 votes
2 answers
4k views

2004 Saturn ION with Ecotec 2.2: Engine misfire with code P0300, ICM problem?

Car came in with a misfire complaint and check engine light on with code p0300. Looking at misfire history confirms high misfire counts on cylinders 1 and 4 along with lower counts on cylinders 2 &...
Ben's user avatar
  • 10.7k
7 votes
1 answer
5k views

Random Misfiring - Tried All Basic Fixes - Tech Says Engine Ground

Starting about a week or two ago, my 3.4L engine (2004 Chevy Monte Carlo LS) has thrown a p0300 code, random misfire. Here are the things I've done: Changed spark plugs and wires Knocked fuel ...
Bashkir's user avatar
  • 123
6 votes
1 answer
2k views

Can a crankcase venthilator hose being off cause misfiring?

I was taking a look at a 2004 Ford Escape with 100k miles yesterday because it was infrequently stuttering, and throwing a "cylinder 5 misfiring" error code that would come on and go away. I figured ...
UnsettlingTrend's user avatar
6 votes
3 answers
23k views

Will Driving 100 Miles With a Misfire Damage My Car?

Background: I have a 2002 Dodge Dakota Quad Cab slt with 4.7L Magnum V8. My check engine light came on when I was at work. I then drove 20 miles home to my house, pulled out my scan tool and ...
Joel's user avatar
  • 193
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 ...
George's user avatar
  • 1,123
6 votes
3 answers
6k views

Black Spark Plugs that Clean Themselves

Vehicle: 2002 Mazda Protégé LX, 2.0L engine, automatic transmission, 240,000 km Recent Work: Thermostat replacement Symptoms: Owner reported that the car shook and stalled on startup. She parked ...
tlhIngan's user avatar
  • 12.2k
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 ...
Andrew's user avatar
  • 353
6 votes
1 answer
1k views

Highlander Hybrid losing oil/coolant

I've received a variety of opinions regarding what may actually be wrong with my car. Here is the story so far... Sep. 2016: ~96k miles: Bought 2008 Toyota Highlander Hybrid from dealership. One ...
Avalanche's user avatar
  • 161
6 votes
1 answer
652 views

What is wrong with my Ford Focus? Missfires and more!

Please see the video of the problem: https://www.youtube.com/watch?v=FHJPoHPamjg&feature=em-upload_owner I'm very stumped to why this is like this all of a sudden Ford Focus MK2.5 Strange Misfire ...
Jeremy's user avatar
  • 63
6 votes
1 answer
2k views

Can Getting Fuel Injectors or Ignition Coils Wet Ruin Them?

I have a 2005 Suzuki Forenza Wagon where I recently cleaned the engine compartment. I was a little careless during the cleaning and water got in under the spark plug wires to sit around the top of the ...
Dalton D's user avatar
  • 1,958
6 votes
3 answers
2k views

2005 Dodge Caravan - Erratic Misfire

The engine was misfiring for quite a while. At some point, the battery went dead due to a bad alternator and all the electrical systems went nuts. I replaced the alternator & battery. At some ...
Larry's user avatar
  • 61
5 votes
1 answer
5k views

Can a bad timing chain result in only a single cylinder misfiring?

The question title should be pretty self explanatory. I have a 2002 Nissan Maxima which began idling and accelerating really poorly (seemingly out of nowhere) a few days ago while I was driving home ...
Ethan Bierlein's user avatar
5 votes
2 answers
6k views

A/C Temporarily Cures Low, Hiccupping Idle

I have a 99 Nissan Almera 1.6L MTX ( nearly identical to the Sentra sold in the US ) which has developed a problem with low idle, occasional stalling at stop lights, what seems to be misfires and ...
Robert S. Barnes's user avatar
5 votes
4 answers
17k views

Spark Plug porcelain fell into cylinder

I own a 2016 Ford Mustang Ecoboost. About a month ago, I had a misfire in cylinder 3. I Decided to just swap out all spark plugs, and only plug that gave me a problem to get out was of course #3. ...
mbritt999's user avatar
5 votes
2 answers
57k views

How to know if the spark plug or the ignition coil needs to be replaced

I have a 2002 E39 520i. One of the cylinders has stopped working (or misfiring) and I am hoping it is because no spark is generated. I am very new to engines so bare with me please. :) My question is:...
Balázs Vincze's user avatar
5 votes
1 answer
839 views

Can swapping ignition coils fix a cylinder four misfire?

My car was having power issues so I took it to the mechanic who said cylinder 4 was misfiring. He came back to me and said he swapped the ignition coils over and rescanned with no misfires and told me ...
AnaruNZ's user avatar
  • 53
5 votes
2 answers
284 views

2004 Dakota problems

I have a 2004 Dodge Dakota 4.7. My truck started to shake going down the road. I heard a pop unsure if it was metal slapping or a backfire. Had it towed home and hooked it up to a computer. The codes ...
user14856's user avatar
5 votes
3 answers
5k views

2001 Lexus ES 300 bank 1 misfire

2001 Lexus ES 300 (3.0L, automatic) The check engine light is on and I scanned it: cylinders 1, 3, and 5 (bank 1) are misfiring. I’m basically getting these 3 symptoms when driving: 1) Cylinders ...
Attila's user avatar
  • 183
5 votes
1 answer
11k views

Ignition coil overheating: what to blame?

I have got in the past ignition coil overheating, making the engine run very erratically and in some cases it even wouldn't run at all until the coil got cooler. In one occasion I changed the coil for ...
Aram Alvarez's user avatar
  • 3,346
5 votes
2 answers
10k views

Random misfires and 2+3 cylinder misfires on 2009 Accord

I have a 2009 Honda Accord 2.4 L. It is reporting random misfires and cylinders 2+3 misfires. There was a thread posted about this same exact problem but was never resolved. Any help would be ...
mwilliams's user avatar
5 votes
2 answers
3k views

My 2008 Hyunai Accent is misfiring on two cylinders, bad gas?

Update: So I went full steam ahead today. Got the new valve cover gasket ($20.99 at AutoZone), unscrewed all the 10mm bolts, pried the cover off, hey! No obvious breaks in the seal! Well, that's good ...
jlehenbauer's user avatar
5 votes
1 answer
1k views

2009 Kia Rio - Potential Misfiring?

I have a 2009 Kia Rio with ~75,000 miles. After I first start the car and accelerate away from where it was parked (especially if I accelerate hard), the car will repeatedly make a quick sound that ...
John Chrysostom's user avatar
5 votes
1 answer
716 views

Ibiza Mk2 MOT emissions test failure

I've had my SEAT Ibiza Mk2 for about three years and it's just failed its MOT on the emissions test - there's fuel in the exhaust on idle, and only on idle. It's in the garage at the moment and they'...
Tom W's user avatar
  • 380
5 votes
1 answer
142 views

Toyota 4Runner - automatic (Old model ) misfires and delay in changing gears. What is the problem?

My Toyota 4 Runner (old model) misfires and seems lazy especially while climbing hills. There is also a delay in changing from gears 2 - 3 and 4. Can someone please help to advise? Thanks in advance.
Paul Damba's user avatar
4 votes
2 answers
2k views

Volvo engine parts

What is the name of these four elements called? If water gets to them, can that cause a misfire?
John Mutuma's user avatar
4 votes
2 answers
14k views

Can lack of oil cause P0300 Random Misfire?

I get OBD code P0300 Random Misfire (and no other error codes) on a very poorly maintained car. I changed the valve cover (whose spark plug well gaskets were degraded) and spark plugs, but the engine ...
Geremia's user avatar
  • 207
4 votes
2 answers
8k views

Troubleshooting a Misfire

Car: 2005 Dodge Grand Caravan In the past few days I started to feel the engine stumble. Yesterday the engine light came on and the error was a that cylinder 4 was a misfire (there was also a "...
Thomas Stringer's user avatar
4 votes
2 answers
3k views

VW Golf IV Possible Engine Misfire

I guess I better start with a few details on the car in question: VW Golf IV 20 valve V5 petrol engine (2.3L) ~80k miles on the clock Now the problem, it feels to me as if the car is down on power, ...
BadAtMaths's user avatar
4 votes
1 answer
123 views

Are there varying degrees of engine misfire?

My fault codes indicate engine misfires on 2 (of 6) cylinders but I don't hear or feel any problems at all in the engine or exhaust. When I've observed engine misfires before, it was pretty obvious. ...
s g 's user avatar
  • 442
4 votes
1 answer
12k views

Engine misfires when car hasn't been driven for a couple of days

My 2001 Hyundai Elantra XD suffers from misfires during the first 5-10 minutes after starting the car. After this, the car runs as as it should. I'm not sure, but I think the misfires only happen when ...
Brecht Machiels's user avatar
4 votes
2 answers
1k views

VW Bora (1.9 L TDI) - Misfire on cylinder 2

It starts every time and the engine shakes badly in higher gears. However, if I turn the engine on and off MANY times it will eventually kick back in and run as it should. So frustrating. Any ...
steve's user avatar
  • 41
4 votes
2 answers
2k views

Why is my Chevy 2008 Cobalt not acting as though it's getting enough fuel and reading "cylinder 4 misfire?"

I have a Chevrolet 2008 Cobalt (LS) that I've had for about 7 years. No sooner do I have this thing payed off, when it starts giving me the following problem (I've never had any trouble with it ...
VoidKing's user avatar
  • 141
4 votes
5 answers
100k views

Random Cylinder Misfire in Cylinders 2, 5, 6, and 8; P0300; Chevy Silverado 1500 4WD

Yesterday on the way to work my 2000 Chevrolet Silverado 1500 4WD with the 4.8L V8 Vortec engine started flashing a check engine light. I read it and it was a P0300 Random/Multiple Misfire. I had ...
StephenH's user avatar
  • 343
4 votes
1 answer
3k views

99 1.3 Corolla 4E-FE engine - possible detonation, surging

Sorry for joining up and immediately asking a question but I'm stumped with my old Corolla. I haven't had it very long, only doing about 1500 miles, but I've got a couple of niggling issues that have ...
Adam D's user avatar
  • 41
4 votes
1 answer
4k views

Hyundai Santa Fe 2004 3.5L Random Misfire hesitates when accelerating

I have a 2004 Hyundai Santa Fe 3.5L V6. When I was driving a couple of days ago the check engine light flashed and after a while it stayed on. The codes are P0300 which is a random misfire as well ...
Glarious Gollam's user avatar
4 votes
2 answers
5k views

Help identifying misfire conditon on 1998 Honda Civic DX

I'm struggling to identify the cause of a misfire condition in my 1998 Honda Civic. It has D16Y7 engine with 185,000 miles on it. The spark plugs, wires, distributor cap, rotor, and ignition coil ...
Robert Stiffler's user avatar
4 votes
2 answers
126 views

Stumbling when starting after garaged

I started parking my 98 Honda Civic Ex in the garage and not driving anywhere from 1-3 days. I've noticed when starting it stumbles and feels like a very slight misfire for about 5-10 seconds then ...
ohmmy's user avatar
  • 615
4 votes
2 answers
3k views

Engine missfires when accellerating first gear

Vehicle: Chevrolet Blazer 2000 V6 4.3L Engine 4WD 234,000 Miles Symptoms: When accelerating, upon reaching about 1500 RPM through about 2250 RPM the engine misfires in first gear (occasionally 2nd ...
Shelby115's user avatar
  • 441
4 votes
0 answers
2k views

2013 Subaru WRX P0300

On a Subaru 2013 since 70,000 miles I've had the fun P0300 code activated and my check engine light on, cruise and traction control disabled. I do not have any other misfire codes being shown(unlike ...
David Rogers's user avatar
4 votes
0 answers
73 views

1st and 2nd cylinder not combusting in dual carburetor'red setup

So I have a Maruti Esteem engine with a dual carburetor on an engine dyno and everything was already installed when I joined this lab. We seem to have a problem when trying to fire the engine. 1st and ...
Vish_evo's user avatar
  • 576
4 votes
0 answers
92 views

03 chevy impala- I have a bad misfire

When I push on the gas it hesitates to go. The check engine light starts flashing but once it gets rolling its gone. I change the spark plugs, put in a gas treatment, shot some B-12 in it and ...
Dexter Estes's user avatar

1
2 3 4 5