I HAVE A 97 GMC SIERRA 1500 4

1997 GMC Sierra

Tiny

beav1411

November, 16, 2012 AT 7:09 PM

I have a 97 gmc sierra 1500 4.3L hestitation at idle and sometimes at first acceleration.
i have changed the O2 sensors, plugs wires cap and rotor, coil, checked fuel rail pressure and have done a vacuum test and still nothing. There are no codes and the CEL has never came on.
Any advice would help.
Thanks Dan.

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5 Answers

Tiny

JDL

November, 16, 2012 AT 7:57 PM

What is the fuel pressure spec? Do you have the spider fuel system? That type system is known for problems. Cold start idle issues? Runs ok after warm-up?

Tiny

beav1411

November, 16, 2012 AT 9:24 PM

Fuel pressure spec that I was given was 56-60 at startup, idle around 55-56psi with a pound or two drop off at engine shutoff.
As fur the spider fuel system I believe I don't.
Air temperature doesn't matter and engine temp doesn't matter, I have had a no start for two days and after I got it towed to the shop the next morning it started and ran the best it has in a while.

Tiny

JDL

November, 17, 2012 AT 2:44 AM

You do have the spider fuel system. 60--66 psi, key on engine off. Psi is less with engine running. I'd check codes anyway, I've had inactive codes point me in the right direction. I need more info to go on.

Tiny

beav1411

November, 18, 2012 AT 5:04 PM

I have check for codes before and I have none. As for me having the spider fuel system how do you know if that is the problem? What tests do I proform? My fuel pressure at key on engine off is 60-61psi. I have just finished running engine and spray brake cleaner around intake and twice I had a poping sound on the left rear side of the intake but I can't get it to do it again. In the area of the intake and the cap. The rpm did not rise so I don't think vacuum leak. Got any more ideas.

Tiny

JDL

November, 18, 2012 AT 6:03 PM

This info is for hesitation--sag and stumble, no codes.

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