mis-fire codes
Thread Starter
Pro
Joined: Jan 2006
Posts: 536
Likes: 3
From: bel air md
mis-fire codes
replaced dual mass flywheel with steel single mass,noisey and vibrates as expected. now seems to be setting mis-fire code any one else have this issue-could they be related. thanks for any input.
Rick
Rick
Thread Starter
Pro
Joined: Jan 2006
Posts: 536
Likes: 3
From: bel air md
confused
dont understand this forum. have heard nice things about this group seems when ever i ask a question i get no or very few respones. is me or how i put the the out there---just wondering
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
The '96 is a hybrid OBD1-OBD2 diagnostic system. Not familiar with it, but I think that code is set when a slight variation in crank speed is detected, as would be the case with a misfire. I could picture that code being set off by the sm flywheel, as the trans rattle would then be directly relayed to the engine. (Just a guess- you didn't hear it from me)
Thread Starter
Pro
Joined: Jan 2006
Posts: 536
Likes: 3
From: bel air md
The '96 is a hybrid OBD1-OBD2 diagnostic system. Not familiar with it, but I think that code is set when a slight variation in crank speed is detected, as would be the case with a misfire. I could picture that code being set off by the sm flywheel, as the trans rattle would then be directly relayed to the engine. (Just a guess- you didn't hear it from me)
Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
I have a 97 Camaro that has had mis-fire detected but not sure if it is even close to the "hybrid" obd1-2 system. But in order for it to have that kind of code set there has to be a resistance change in the spark plug circuit .. plug wires/coils/plugs. A rattle won't cause it, I would be more inclined to say the knock sensor is hearing it.
My misfire detected was from a plug wire that was blistered and brittle. My 3.8 has a great deal of engine related noises but only time misfire detected was plug wire related.
good luck
My misfire detected was from a plug wire that was blistered and brittle. My 3.8 has a great deal of engine related noises but only time misfire detected was plug wire related.
good luck
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Burning Brakes
Joined: Oct 2009
Posts: 773
Likes: 2
From: Minneapolis MN
If the problem happened after the work-its 99% of the time from the install.That 1% is coincidence.My guess would be a knock sensor as their sensing knock then adjusting computer & computer reads as a slight misfire.I've read too many problems(here) when not sticking to the dual mass flywheel to not ever recommend installing anything else even though expensive.I wouldn't keep driving the car & don't ignore this problem.Keep us updated on what you find
First year for OBD II for Fed. Emmisions.
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
Melting Slicks
Joined: May 2010
Posts: 2,082
Likes: 3
From: Conowingo Maryland
that code is set when there is like a 3% difference in RPM's at set points. Lets say at a steady 1500 if between the firing of one cyl to the next is more then 3% it will set a code. The bad part is untill latter years was tech good enough to idenify what cyl it was coming from. Jeff the ECM does not measure resistance change in the wires,plugs ect. I am sure what happened with your car was it had a miss from a bad plug wire that missed was picked up by a difference in the RPM's. To the PO I do not think the noise would cause what you are expericing but it may be possible that you new flywheel is not balanced right and causing a RPM veraince. But I would be sure you do not have a slight miss.