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Oct 27, 2003 | 10:52 AM

stevec

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From: Sterling, VA, USA

Backfire

I took a ride yesterday in my '92 roadster and in the middle of a full throttle run, it backfired just after shifting into 2nd. I bought this car new and I've never heard it do that before! What are some of the reasons for a backfire?

Thanks,
Steve

Oct 27, 2003 | 12:49 PM

bogus

Team Owner

Joined: Aug 2000

Posts: 40,156

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From: San Pedro CA

Re: Backfire (stevec)

how many miles?

sounds like the opti is beginning to go south.

you might also need a tune up.

what is the maintenance history?

Oct 27, 2003 | 01:11 PM

Tom Piper

Safety Car

Joined: Feb 1999

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From: Mexico Beach FL

Re: Backfire (stevec)

The backfire is a known problem -- GM issued a service bulletin on it.

Go to this site and search the page for "backfire." http://www.c4vettes.com/92sb.htm

Tom Piper

Oct 27, 2003 | 04:51 PM

stevec

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From: Sterling, VA, USA

Re: Backfire (Tom Piper)

Quote:

The backfire is a known problem -- GM issued a service bulletin on it.

Go to this site and search the page for "backfire." http://www.c4vettes.com/92sb.htm

Tom Piper

I called a Chevy dealership here and the fix for the problem listed in the Service Bulletin is to replace the MEMCAL (EPROM). I was going to put in a power chip anyway so this is not real bad news.

Thanks!
Steve

Oct 27, 2003 | 05:03 PM

bstirn

Racer

Joined: Jul 2003

Posts: 287

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From: sykesville md

Re: Backfire (stevec)

If youre lucky it will fix it I have replaced every thing and still have a similar problem I am replacing valve springs & 1.6 RR this weekend . Mine backfires between the 1st and 2nd shift . Good luck

Oct 28, 2003 | 08:05 AM

stevec

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From: Sterling, VA, USA

Re: Backfire (bstirn)

Quote:

I checked the Service Bulletins for '93 and the bacfire problem wasn't listed. So it seems that according to GM, the chip replacement was the fix. But I'm hearing on this board that it's "maybe not"?

Steve

Oct 28, 2003 | 08:40 AM

bogus

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Posts: 40,156

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From: San Pedro CA

Re: Backfire (stevec)

I am not entirely sure... Mine sometimes pops, but usually on trail throttle...

(mine is a 6spd)

I have no clue if mine has been done, either. I should have the VIN run through a computer to confirm WHAT has been done...