1994 GMC S15 Idle issues

DUSTIN1996

MEMBER
1994 GMC S15
120,000 MILES

I am having issues with the idle and it keeps shutting off at idle in drive, idles really rough, all the timing parts have been changed, has white smoke when running, dies down the smoke after warms up, dont know how warm cause cant get the temp guage working, any help would be appreciated, I am taking a sjot in dark that its possibly the head gaskets or intake gaskets.

5 Replies

HMAC300

MECHANIC
48,601 POSTS

What engine? Scan for codes and check fuel pressure first.

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Tuesday, July 16th, 2013 AT 6:17 AM

DUSTIN1996

MEMBER
3 POSTS

It's a 4.3 W code engine, so I am guessing its the CPI from what I found researching it. Ok thanks will do and see what comes up with it.

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Tuesday, July 16th, 2013 AT 8:05 AM

HMAC300

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48,601 POSTS

It should be 55-61 psi unless it's atbi unit which should be 9-11 psi.

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Tuesday, July 16th, 2013 AT 10:24 AM

DUSTIN1996

MEMBER
3 POSTS

Ok, we'll I checked the pressure and its way low for CPI, it came out at about 30psi, and I pulled the top plenum off and there's quite a bit of raw fuel sittin on top of lower enum, and pulled the injectors out and there's not a single o-ring on any of them, so ordering a set from Rockauto and gonna change the fuel cap also, so will see if it comes back up to normal when that's done and see if that remedies the issue, will keep you posted, thx

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Monday, July 22nd, 2013 AT 10:49 AM

HMAC300

MECHANIC
48,601 POSTS

It's probably the fuel pump the orings should be replaced if there were none but check inside the lower intake for them as they could have slid off. The pressure wouldn not be affected if truck wasn't running as it can be taken with just the key on.