Misfire
08-18-2011, 06:34 PM
#1
MFz Regular
Thread Starter
Join Date: Aug 2011
Location: Waller,TX
Posts: 62
Misfire
Gf was driving My stock 99, and it is hot here. Stopped at drivethru, took off and said it was running bad. She said it was missing. Stopped car for a few minutes ( not long enough to cool down ), restarted and ran fine. No codes...I have spare sensors, but I can not get the damn thing to do it for me. I even have at least one good coil, but I've never had coil trouble on either 99. I am not just gonna swap the parts without knowing which one. Sooner or later it will do it again.
08-19-2011, 07:55 AM
#2
MFz Lurker
Join Date: Aug 2011
Location: Lawrenceville
Posts: 22
That is what happen with my 99 when the coil went bad. Once the car got good and hot the car was missing bad. After the car sat for a day untill I could work on it the car ran fine for a short while before missing again.
I would go ahead and replace the coils if you have spares it is easy and does not take but an hour. If it is the coil and it starts failing again the un used gas that gets in the exhaust will ruin your cat quickly.
Just my 2 cents
I would go ahead and replace the coils if you have spares it is easy and does not take but an hour. If it is the coil and it starts failing again the un used gas that gets in the exhaust will ruin your cat quickly.
Just my 2 cents
08-19-2011, 08:05 AM
#3
MFz Regular
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Join Date: Aug 2011
Location: Waller,TX
Posts: 62
^^ while this is true...would of had a random missfire code. Should of had one anyway. I think more the cam sensor, although this is more common on 01s and up. It will do it again, and sensors are in the trunk.
08-19-2011, 08:20 AM
#4
BAMFr
Join Date: Jul 2011
Location: NC
Posts: 1,787
I would be careful waiting for the coilpack to go bad. You may have to replace the cat and o2 sensor if you do...
It sounds like a bad cat, there is just no real reason why its the cam sensor. Unless you have been hammering at it or generally abusing it, its not a common fail part for the 99s. Plus, usually a bad cam sensor causes the car to turn off on you also.
It sounds like a bad cat, there is just no real reason why its the cam sensor. Unless you have been hammering at it or generally abusing it, its not a common fail part for the 99s. Plus, usually a bad cam sensor causes the car to turn off on you also.
08-19-2011, 08:34 AM
#5
MFz Regular
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Join Date: Aug 2011
Location: Waller,TX
Posts: 62
As said it is not common on a 99, but they will heatsoak on a 99 also. They don't always turn the car off, but can misfire, buck, or surge. All three of these discriptions, to me sounds like a misfire though. If the cat dies... oh well I'll replace with a spun metalic Magnaflow. The one on my turbocar works great.
08-19-2011, 10:40 AM
#6
BAMFr
Join Date: Jul 2011
Location: NC
Posts: 1,787
they heatsoak, but its not any more than normal (like putting it in the back of the engine).
Either way, seems you have a good grasp of the situation. When the cam sensor gets bad enough it will cut off on you, or if its the coilpack you will just get the misfire & bad cat/ second o2 codes.
Either way, seems you have a good grasp of the situation. When the cam sensor gets bad enough it will cut off on you, or if its the coilpack you will just get the misfire & bad cat/ second o2 codes.