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

"Can a bad timing chain result in only a single cylinder misfiring?" No it cannot. It could be a Bad ignition coil on that cylinder, if there is a coil for each cylinder swap it from another ...
Moab's user avatar
  • 7,990
14 votes
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Volvo engine parts

What you have circled are the connectors for the fuel injectors (and obviously the fuel injectors are underneath of them). They have seals which protect from moisture, dirt, and debris, so in most ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
8 votes
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Should misfire counts be zero?

You're raised two questions: Should these counts be just dead-nuts 0? In my experience, NO. While I'm sure every manufacturer has their own standard for when to set the CEL on a misfire, some ...
jwh20's user avatar
  • 12.1k
7 votes

MAZDA 3 2006 (UK) - poor acceleration then takes off at 3250 revs

My gut says it's likely to related to either a dodgy throttle position sensor or a faulty air mass meter. Whilst it is reporting no errors, it's worth doing diagnosis such as resetting the throttle ...
Steve Matthews's user avatar
5 votes

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

Essentially you have put 10 milliliters of oil in your gastank I have done this before with more oil than that on accident into my truck. My solution was to fill the tank to the top and dilute it as ...
DucatiKiller's user avatar
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5 votes
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08 Silverado 5.3 rough idle and dark cold start exhaust

First of all, the 5.3l engine (could be all of the Vortec LS engines, don't know) is thirsty. It drinks a bit of oil. Be aware you could be looking at up to 2 quarts between oil changes. I don't know ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes
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The Mystery of the Misfiring MINI

It was the high pressure fuel pump. After letting it sit overnight, the dealership was able to reproduce the issue and replaced the pump under the extended warranty. The car is driving like it did ...
Spivonious's user avatar
5 votes
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Can lack of oil cause P0300 Random Misfire?

There's nothing that detects whether the plugs are actually igniting the mix evenly, it is inferred from the acceleration that the crankshaft undergoes each time a cylinder fires. There's plenty of ...
Phil G's user avatar
  • 1,087
5 votes

Spark Plug porcelain fell into cylinder

While it could be an issue for the porcelain to drop into the cylinder, it's not going to make your car run bad. Either there is damage to the engine or components and the engine will run crappy all ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes

Cylinder misfire after leak down test

You don't say why you needed a leakdown test in the first place. If you rotated the engine by hand in the opposite direction that it normally runs and it has a timing belt then it is possible that the ...
retiredmechanic's user avatar
4 votes

Corsa D Stuttering Accelaration with Malfunction Light flashing

A flashing check engine light means you have an active misfire. Driving your car while misfiring for an extended period of time can cause damage to your catalytic converter, so try not do do that. ...
JPhi1618's user avatar
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4 votes
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What is wrong with my Ford Focus? Missfires and more!

My first questions for you? Isn't that a new car, still under factory warranty? What did the dealership tell you? (What year is the car? what is the mileage?) If not, that sure looks like a wiring ...
zipzit's user avatar
  • 6,569
4 votes

Can (possible) exhaust system damage cause random misfires?

If the muffler hitting the railroad tie stopped the car, you very well may have snagged something loose. Visually inspect your exhaust and pay special attention to the O2 sensors, they may have been ...
tlhIngan's user avatar
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4 votes
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Meaning of Timing valve is open

The P0018 code is related to your cam and crank showing incorrect timing There are two sensors involved in this error. Cam Position Sensor Crank Position Sensor These two sensors detect the angle ...
DucatiKiller's user avatar
  • 32.9k
4 votes

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

I don't know that particular car well, but maybe a vacuum leak? Perhaps it's at the intake manifold, and worsening as the parts warm up, expand, and mating surfaces change shape?
Cliff's user avatar
  • 41
4 votes

Highlander Hybrid losing oil/coolant

I don't recommend driving it further; you risk packing up the cooling system if oil makes its way there. You might want to invest in some quick tests before you buy anything: You need to confirm if ...
Zaid's user avatar
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4 votes

Black Spark Plugs that Clean Themselves

I've seen this behaviour on a car with a hairline crack in the fuseboard. The result was that sometimes the car would run beautifully and sometimes it would all but die and bog down on the throttle. ...
Steve Matthews's user avatar
4 votes

Weird object in cylinder head preventing spark plug install

It appears the threaded portion of the body has broken away from the body itself. The split would have occurred at the point where the image below points to as "spark plug gasket". This could have ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes

Pros and cons of driving a vehicle with a misfiring cylinder

I can relate a story from my own experience with my daughter's car. Turns out it had two bad ignition coils that caused the engine to misfire when it was raining. Did she stop when the check engine ...
jwh20's user avatar
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4 votes
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Can swapping ignition coils fix a cylinder four misfire?

It normally wouldn't, however, I'm thinking the problem might have been the wiring connector to the coil wasn't making a good connection (or possibly causing an intermittent connection), which was ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes
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Is it possible to have a good looking spark but but still not suitable for ignition?

Inside the cylinder is quite a hostile environment. What looks like a strong looking spark at atmospheric pressure outside of the cylinder can become nothing at high pressures in a fuel rich ...
HandyHowie's user avatar
  • 25.4k
3 votes

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

I'm having trouble seeing the "oil event" and the "limp mode" as being related. When you added the oil, it was – as @DucatiKiller pointed out – only about 10 ml. This went into about 48 liters of fuel....
dlu's user avatar
  • 14.5k
3 votes

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

To test the coil, as you said there's only one cylinder that isn't working, just switch the coils of two cylinders. For the spark plugs, again you'll just switch two if you want to test one against ...
Cullub's user avatar
  • 1,364
3 votes

04 GMC Savanna G2500 4.8 V8 No Power

Make sure the cam and crank signals are good. Also check the reluctor for the crank and cam sensor.
Derek's user avatar
  • 271
3 votes

How does low oil level cause misfires or VTEC malfunctions?

Just had the EXACT same thing happen to my 2004 Accord EX 4 cyl/auto trans. . Accelerating with A/C on... car began cutting out. Immediately turned A/C off and backed off the accelerator. When I got ...
Tyrus 45680's user avatar
3 votes
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Engine misfires when car hasn't been driven for a couple of days

As @Pᴀᴜʟsᴛᴇʀ2 mentioned in the comments, it seems unlikely that your misfiring issues are caused by the catalytic converter. What would be a useful next step would be to use an OBDII diagnostic ...
Edward's user avatar
  • 2,857
3 votes

Misfire in single cylinder 4 stroke engine

In my experience, you are not describing a misfire. A misfire is a lost power cycle. It would typically be evident during steady engine speeds, or especially noticeable under the load of acceleration, ...
CharlieRB's user avatar
  • 9,015
3 votes

Black water from exhaust, cylinder misfire and rought idle

Solved, it was a fuel injector that sprays extra gasoline. Cylender 1 was the almost the only one that misfires although others does every now and then. The situation becomes worse when I add ...
Aus's user avatar
  • 276
3 votes
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Is hot desert weather the source of my recurring car problem?

My immediate idea was that P0506 means there is a vacuum leak somewhere. I googled for P0506, and the first page I found also mentions vacuum leak as the first possible cause of failure: https://www....
juhist's user avatar
  • 14.6k
3 votes

Black Spark Plugs that Clean Themselves

You mentioned the coil and leads, but I would inspect the leads for cracks etc. They may test within spec when removed from the car, but when vibrations start or they bend and flex, they could leak ...
Grantly's user avatar
  • 311

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