BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Backfireing under the hood on startup

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cloud 9

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Posts : 563
Join date : 2009-10-03
Age : 49
Location : Dover, NH

PostSubject: Backfireing under the hood on startup   Thu Oct 13, 2011 6:42 pm

Last couple days whenever I start the Caprice it pops from under the hood when I give it any gas for the first 30 seconds it is running. After that she is fine, normal. Any input?????
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bowtiepimp

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PostSubject: Re: Backfireing under the hood on startup   Thu Oct 13, 2011 7:05 pm

cloud 9 wrote:
Last couple days whenever I start the Caprice it pops from under the hood when I give it any gas for the first 30 seconds it is running. After that she is fine, normal. Any input?????



LT1 car? if so..... sounds like an opti.....
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Ironfistdog

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PostSubject: Re: Backfireing under the hood on startup   Thu Oct 13, 2011 7:47 pm

Check your air intake elbow for holes, also check the MAF and IAC. Any Sticking valves?
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PostSubject: Re: Backfireing under the hood on startup   Thu Oct 13, 2011 8:05 pm

OPTI!!!!!!!!!!!!!
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cloud 9

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PostSubject: Re: Backfireing under the hood on startup   Sun Oct 16, 2011 2:16 pm

So just cause it was easy and inexpensive I replaced the fuel filter. Still doing it though. Weird, it only does it for the first 60 seconds after cold start then runs and starts easy after warmed up, responsive as normal. I have looked all around the engine compartment nothing disconnected or cracked. I believe it has the original opti in it. 80k miles and 17+ years old, sounds like that may be my next option. Any other ideas before I get into it would be appreciated. scratch scratch scratch
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bowtiepimp

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PostSubject: Re: Backfireing under the hood on startup   Sun Oct 16, 2011 2:36 pm

IMPALADAKID wrote:
OPTI!!!!!!!!!!!!!




Sleep
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Machine-De-Zine

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PostSubject: Re: Backfireing under the hood on startup   Sun Oct 16, 2011 3:35 pm

bowtiepimp wrote:
IMPALADAKID wrote:
OPTI!!!!!!!!!!!!!




Sleep

Sounds like possibly a "lean-pop" backfire.

Check for anything that delivers the necessary rich fuel mixture required when cold.

The computer needs to know various temps though-out the engine systems.

O2, coolant temps, A/F ratio, Etc. The FSM (factory service manual) has excellent procedures for tracking down the cause.

The normal hot engine fuel ratios will be too lean while flowing through the cold intake runners, condensing on the cool surfaces.
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cloud 9

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PostSubject: Re: Backfireing under the hood on startup   Sat Oct 22, 2011 10:06 am

Put in a new coolant temp sensor. Everything ok now. Cheap fix, very happy. cheers Thanks for the advise guys.
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Matt Trakker

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PostSubject: Re: Backfireing under the hood on startup   Sat Oct 22, 2011 10:50 am

Nice!
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