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94 GMC 5.0 litre stalls at stop sign
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bearman
Novice
Aug 13, 2009, 4:40 AM
Post #1 of 4
(1675 views)
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94 GMC 5.0 litre stalls at stop sign
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Dont know what it is? The truck starts every time after it stalls , the only time this happens is when it is warmed up. I have replaced the following, distributer, cab, wires, plugs, o2 sensor,. The egr was checked map sensor aswell. I have spent over 800.00 and it is not fixed yet. Please help. Thanks
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 13, 2009, 4:55 AM
Post #2 of 4
(1672 views)
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Re: 94 GMC 5.0 litre stalls at stop sign
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You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
Veteran
/ Moderator
Aug 13, 2009, 10:05 AM
Post #3 of 4
(1662 views)
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Re: 94 GMC 5.0 litre stalls at stop sign
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bearman; As Hammer suggested, that is the most common problem. A couple of other thoughts if that doesn't take care of the issue; 1) You'll need a scanner, but would like to see what the CTS is seeing when this happens. 2) Check for vacuum leaks. When the engine is cold, the CTS will command a rich mixture, which can 'mask' a leak. 3) Since it starts right up after stalling, this might be tough, but need to find out if it is losing spark at that particular time. 4) Crank sensors can go bad when hot, although not common on this particular vehicle, and not always set a DTC. Same with ignition control modules. If the IAC cleaning doesn't take care of it, do more diagnosing prior to throwing parts at it. We can help you with that, if you need it.
Loren
SW Washington
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bearman
Novice
Aug 17, 2009, 11:29 AM
Post #4 of 4
(1638 views)
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Re: 94 GMC 5.0 litre stalls at stop sign
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Thanks guys I will give it a shot tommorow, and let ya know how I make out. Thanks again Bearman
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