Hi there,

2003 Avalanche
191,000Kms
5.3L
4x4

When I am driving at low speed and lets say I turn sharply and apply the
brake to enter a parking spot or to stop and back up, the vehicle will
stall. It will start up right away all the time after this happens. As well
I notice that when I am at a stop light the truck will idle real low and the
volt meter will go way down and the lights will dim until I step on the gas
to accelerate. Same happens when I run the defroster or the A/C.

Any Ideas?

thx,

BG.

On Sat, 7 Feb 2009 01:10:02 -0600, "Furnace"
<furnace44 (AT) sasktel (DOT) net> wrote:

Hi! It's a vacuum leak, most likely. Some times the vacuum hoses
are cracked and they don't look like it; some times the oil fill
cap is allowing air to be sucked in; some times the air intake
hose (duct) is cracked and allowing air in. That is the "easiest"
thing to check. If the hoses are good, it could be a stuck PCV
(positive crankcase valve).

On my Toyota the air intake hose was split underneith where it was
not visible, and the vehicle was doing exactly what you described
above. I patched it with duct tape, bailing wire, and more duct
tape because I'm poor white trailer trash, and it solved the
problem.




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"Desertphile" <desertphile (AT) invalid-address (DOT) net> wrote


That's unlikely to be the cause, vacuum leaks tend to increase the idle, not
decrease it.
This is more likely the cause.......
http://www.automotivehelper.com/topic210522.htm
Along with that, as a matter of course he should pull any stored codes with
an OBDII reader and see what's there.

On Sat, 07 Feb 2009 17:41:30 GMT, "Augustus" <no_one (AT) nowhere (DOT) net>
wrote:


Uh, it is an obsewrved fact that a vacuum leak can cause low idle
and stalling when the vehicle comes to rest.

Please do the following test: start your vehicle's engine (if you
have one) and get it up to operating temperature; then unscrew the
oil fill cap and remove it. Or disconnect the air intake hose.



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Desertphile's Desert Soliloquy. WARNING: view with plenty of water
"Why aren't resurrections from the dead noteworthy?" -- Jim Rutz

An unusually high idle is indicative of a vacuum leak. This is pretty
common knowledge....pull offyour PCV hose and see what happens if you
don't believe me..

On Sun, 08 Feb 2009 00:23:45 GMT, Augustus <no_one (AT) nowhere (DOT) net>
wrote:

Did you do the test I suggested? If you did you will have
discovered the engine idle speed will decrease. This is also true
for a bad air intake hose and other vacuum hoses.


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Did you do the test I suggested?

Did you do the test I suggested as well?

Not yet.

"Augustus" <noone (AT) nowhere (DOT) net> wrote

"Augustus" <noone (AT) nowhere (DOT) net> wrote


Dear idiot,

Giving people wrong advice is not doing them a favor.


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Desertphile's Desert Soliloquy. WARNING: view with plenty of water
"Why aren't resurrections from the dead noteworthy?" -- Jim Rutz