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Old March 11th, 2007, 03:20 PM   #1
chris1044
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Default 01 silverado, 5.3, stalls at stops

My old mans truck, located roughly 150 miles away now, keeps stalling when he comes to a stop sign, or goes from park to reverse, or cuts the wheel all the way to full lock in a parking lot......all stuff at low vehicle speed and low engine idle will basically kill it.


It's got 80k on it, and I just put a fuel pump in it (delco - not a cheapo) under warranty last weekend. I did it because

1) fuel pressure was down to roughly 48 psi (dont know how it still ran) and
2) it was under warranty still, and as we all know it's not if the fuel pump goes, but rather when

Before I put the pump in it had this same problem, but according to my dad it's gotten worse since the new pump. I did check fuel pressure after I did the pump and verified that it was in spec (as was pump volume). It runs great off idle, but can't hold an idle.

After I did the pump I scanned the truck using a Tech II, and the only out of the ordinary thing I saw was that the desired IAC position was 300 and the actual IAC position was roughly 150-200ish.....I know that sounds weird, but at the time I had other priorities and couldn't further diag the truck. Only thing I could think of is that the PCM was in a relearn for the new fuel pressure, and that *hopefully* it would relearn and be fine - well, it's not......


So, anyone know of a common sensor on these motors that would cause this condition?? I know what it needs (me driving home and actually doing diag on it) - but I'm just wondering if this is common or not???
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Old March 11th, 2007, 06:10 PM   #2
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sounds like the EGR is stuck open. it is most likely the issue given the miles. they carbon up so remove it and see if you can pick anything out of the seat of the valve.
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Old March 11th, 2007, 06:25 PM   #3
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Quote:
Originally Posted by Yetti View Post
sounds like the EGR is stuck open. it is most likely the issue given the miles. they carbon up so remove it and see if you can pick anything out of the seat of the valve.
True, it does sound like that - only reason why I didn't take it off was because on the scanner it stated that the "actual" position was 0% at idle.......it is something to check though......
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Old March 29th, 2007, 09:00 PM   #4
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CLEAN THE THROTTLE BODY!! clean the plate and housing throughly. it will fix it, very common problem!
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