Intermittent misfire
Thread Starter
Cruisin'
Joined: Dec 2014
Posts: 19
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From: Toronto
Intermittent misfire
Well looking for some advise. Seems my car has an intermittent misfire. While driving to work tonight, I accelerate from the lights and hear two muffled pops and CEL comes on than the motor is running smooth as silk. I had a misfire code about 3 months ago as well so I changed all the plugs and 1 coil pack but never heard the popping sound before.
How I wish I had my scanner rite now...lol
How I wish I had my scanner rite now...lol
Senior Moderator
Joined: Feb 2006
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From: Space Coast, FL
check all your spark plugs and make sure they are tight! The J-series is known to loosen spark plugs over time and make them eject!
Go to autozone and you can get a scanner and see which cylinders it was on. How many miles on the car? Premium fuel? how hard were you accelerating?
The pop could have been backfire from unburnt fuel in the exhaust. I would run a fuel cleaner like redline SI-1 or Chevron techron and see if it helps before throwing parts at the problem.
Once you know which cylinders are misfiring, move the coils around and see if the problem moves with the coil or stays at the same cylinder/s
Go to autozone and you can get a scanner and see which cylinders it was on. How many miles on the car? Premium fuel? how hard were you accelerating?
The pop could have been backfire from unburnt fuel in the exhaust. I would run a fuel cleaner like redline SI-1 or Chevron techron and see if it helps before throwing parts at the problem.
Once you know which cylinders are misfiring, move the coils around and see if the problem moves with the coil or stays at the same cylinder/s
Thread Starter
Cruisin'
Joined: Dec 2014
Posts: 19
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From: Toronto
Just waiting to get home and hook it up to the scanner. If it comes up cylinder #1, I'm thinking the coil might be gone because that's the reason I changed the plugs originally. Just hoping not an injector going bad.
Thread Starter
Cruisin'
Joined: Dec 2014
Posts: 19
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From: Toronto
Well scanned the car, misfire cylinder #1 again. Thinking the new coil I bought is junk. Well I'll move it to another cylinder tonight and see what happens.
I've always run Shell V power( no ethanol) and it only has 167,000 Km.
I've always run Shell V power( no ethanol) and it only has 167,000 Km.
Last edited by Pazzo1; Jul 10, 2015 at 09:44 AM.
Senior Moderator
Joined: Feb 2006
Posts: 21,404
Likes: 2,184
From: Space Coast, FL
When were the spark plugs replaced? Move the coil over to the other bank of cylinders and report back. I'd take out the #5 coil and spark plug and swap both over to #1
Team Owner
Joined: Mar 2006
Posts: 20,172
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From: Bakersfield
If it does it more under heavy load once hot, it's probably ignition, especially a coil. If it does it most at idle it's likely a mechanical issue like low compression.
If the pop is through the intake it's likely a lean condition. Just one cylinder misfire would point to an injector. All cylinders misfiring would be pump or regulator.
You don't need to move the coil to the other bank. Just move it to the easiest to get to.
If the pop is through the intake it's likely a lean condition. Just one cylinder misfire would point to an injector. All cylinders misfiring would be pump or regulator.
You don't need to move the coil to the other bank. Just move it to the easiest to get to.
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