PlEaSe HeLp! ! ! ! ! !
Thread Starter
Instructor
Joined: Oct 2002
Posts: 152
Likes: 0
From: Jasper Alabama
PlEaSe HeLp! ! ! ! ! !
Help my car is missing at high RPM and backfiring. I'm not sure what it is but I was thinking maybe the optispark. The car has 118000 miles and as far as I know it's the original opti. I don't think it's the plugs or plugwires becouse I changed them last year.Thanks in advance. :D :cool:
Race Director
Joined: Aug 2002
Posts: 13,356
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From: tucson AZ
St. Jude Donor '04 & '05
Re: PlEaSe HeLp! ! ! ! ! ! (White LT1)
You changed the plugs last year????
Does this ring any bells to you?????
Pull them...see what the color is and the status of the plugs are...
Then let us know what problems you have????
What is the milage of your vette????
:cool: :cool: :cool:
Does this ring any bells to you?????
Pull them...see what the color is and the status of the plugs are...
Then let us know what problems you have????
What is the milage of your vette????
:cool: :cool: :cool:
Pro
Joined: Sep 2002
Posts: 500
Likes: 0
From: Mississauga ONT
Re: PlEaSe HeLp! ! ! ! ! ! (White LT1)
Check your fuel pressure. Opti is widely misconcieved as the culprit every time. You will notice many people change 2 optis and still have problems, although with your mileage it is a possibility. heres a quick list to check...
Fuel pump (check pressure)
Coil may be faulty
Opti >>>> with the backfiring this may be the problem.
Fuel pump (check pressure)
Coil may be faulty
Opti >>>> with the backfiring this may be the problem.
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
Re: PlEaSe HeLp! ! ! ! ! ! (White LT1)
Id start by checking fuel pressure at the rails under a load, (going down the road when it is missing) If it is dropping Id change the fuel filter first.
Racer
Joined: Feb 2002
Posts: 455
Likes: 0
From: Fraser MI
Re: PlEaSe HeLp! ! ! ! ! ! (White LT1)
Help my car is missing at high RPM and backfiring. I'm not sure what it is but I was thinking maybe the optispark. The car has 118000 miles and as far as I know it's the original opti. I don't think it's the plugs or plugwires becouse I changed them last year.Thanks in advance. :D :cool:
:cheers:
Melting Slicks
Joined: May 2001
Posts: 2,143
Likes: 7
From: San Diego CA
Re: PlEaSe HeLp! ! ! ! ! ! (White LT1)
You might consider having your injectors R&R'd. They could be dribbling instead of atomizing.
If the missing just started and in the near future you start noticing the idle jumping around, then budget for an opti (with 118K maybe you want to do this anyway).
If the missing/backfiring stays high RPM only, then I would suspect the coil/module.
[Modified by John Row, 3:06 PM 10/30/2002]
If the missing just started and in the near future you start noticing the idle jumping around, then budget for an opti (with 118K maybe you want to do this anyway).
If the missing/backfiring stays high RPM only, then I would suspect the coil/module.
[Modified by John Row, 3:06 PM 10/30/2002]
