Cylinder Misfire before it get warmed up
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Veteran
Joined: Jan 2010
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From: Raonoke, IL
another thing i noticed, once in a while when im driving at highway speeds in O/D it will jerk and buck and you can see the rpms flutter up and down really fast. and sometimes when i driving the check engine light will start flashing and there doesnt seem to be anything wrong, then if i let off the gas for long enough the light turns off...
idk if that helps narrow things down...?
Legend
Joined: May 2005
Posts: 8,663
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From: Central Oklahoma
alright i aint that stupid, lol
another thing i noticed, once in a while when im driving at highway speeds in O/D it will jerk and buck and you can see the rpms flutter up and down really fast. and sometimes when i driving the check engine light will start flashing and there doesnt seem to be anything wrong, then if i let off the gas for long enough the light turns off...
idk if that helps narrow things down...?
another thing i noticed, once in a while when im driving at highway speeds in O/D it will jerk and buck and you can see the rpms flutter up and down really fast. and sometimes when i driving the check engine light will start flashing and there doesnt seem to be anything wrong, then if i let off the gas for long enough the light turns off...
idk if that helps narrow things down...?
Check engine light flashing means a misfire. I doubt it is a clogged cat, but it could either be the camshaft sensor or even a clogged injector. The CKP can be a booger and cause all kinds of mayhem. I would recommend removal and inspection for cracks or breaks. Clean all of the connections really well and put some di-electric grease on the pigtail.
But it could also be the TPS or the wires in the trans pan,can't find the write up about the trans wire harness.
Legend
Joined: May 2005
Posts: 8,663
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From: Central Oklahoma
Good point about the transmission harness and the TPS; however, since it seems to always correlate to Cyl #4 that leads me to suspect the cam sensor. He may have more than one issue at hand.
Retired Moderator - RIP
Joined: May 2008
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From: NH
I agree Bugs. One more thing though, if the light is flashing I believe that is a multiple misfire, (or other problem) not just one cylinder. Bottom line is he needs to check the codes again.
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Veteran
Joined: Jan 2010
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From: Raonoke, IL
will it still throw codes if my check engine light is not on, because it usually goes off if i drive a while or if i turn it off/on... the last time i had the codes read(a few months ago) it said cylinder 4 misfire and something about a bank running to rich? idk i cant remember but ill go get em checked again...
Legend
Joined: Jul 2007
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From: DFW, Texas
It could be the unspeakable.
A crank in the cylinder head seats on the #4 may misfire on a cold engine and as it heats up the metal expands and seals the crack. Then when you jump on it, the crack can't hold back the higher pressure and it Misfires again.
That damn flashing misfire is a hard one to track down.
Bank rich probably means the O2 sensor is seeing too much unburnt fuel, which is typical for a misfire as well.
A crank in the cylinder head seats on the #4 may misfire on a cold engine and as it heats up the metal expands and seals the crack. Then when you jump on it, the crack can't hold back the higher pressure and it Misfires again.
That damn flashing misfire is a hard one to track down.
Bank rich probably means the O2 sensor is seeing too much unburnt fuel, which is typical for a misfire as well.
Thread Starter
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Veteran
Joined: Jan 2010
Posts: 316
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From: Raonoke, IL
It could be the unspeakable.
A crank in the cylinder head seats on the #4 may misfire on a cold engine and as it heats up the metal expands and seals the crack. Then when you jump on it, the crack can't hold back the higher pressure and it Misfires again.
That damn flashing misfire is a hard one to track down.
Bank rich probably means the O2 sensor is seeing too much unburnt fuel, which is typical for a misfire as well.
A crank in the cylinder head seats on the #4 may misfire on a cold engine and as it heats up the metal expands and seals the crack. Then when you jump on it, the crack can't hold back the higher pressure and it Misfires again.
That damn flashing misfire is a hard one to track down.
Bank rich probably means the O2 sensor is seeing too much unburnt fuel, which is typical for a misfire as well.