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Tahoe Stalling

silverado19

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silverado19 Enthusiast

silverado19

Posted
Posted

I have a 2001 Tahoe 2wd, 5.7L w/ 55000 miles on it. Before I take it into the shop for the problem I am having I thought someone out there might be able to give me some idea of what the problem is.

 

When I am driving and come to a stop, the Tahoe almost stalls out. :chevy: If I am turning in a real tight circle, the Tahoe does stall. It starts right up, but when turning sharp again, the Tahoe will stall again. It does not do this when turning at speed, just when making a low speed tight turn. Any ideas before I take it in to the shop?

 

Thanks for any help you can give me.

 

Mark

ktmjim215 Enthusiast

ktmjim215

Posted
Posted

Clean the carbon from the butterfly in the throttle body. Pull the rubber intake hose off at the intake, front of the engine. Clean with carb cleaner/brake clean. Then add a bottle of Fuel Injection cleaner to the gas. The engine will start rough and then smooth out after cleaning. The whole thing takes less than 10 minutes.

budhayes3 Senior Enthusiast

budhayes3

Posted
Posted

All good suggestions. I'd try cleaning the throttle body first, since it's a maintenance item that should be done regularly and if it's gummed up with carbon it could block up IAC passages that are necessary for idle-up conditions when there is a load on the engine. If that doesn't work, you can use carburetor cleaner to try to locate a vacuum leak. With the engine running, spray around the intake and throttle body...if there is a vacuum leak the idle will raise when sprayed with the carb cleaner.

 

Another thing that could cause the stalling like you described is the EGR valve sticking open or a torn EGR diaphragm, which causes a large vacuum leak. Sometimes they stick open from excessive carbon, or just normal wear and tear.

JayMan Enthusiast

JayMan

Posted
Posted

If you do clean the TB/IAC, make sure to only use a cleaner approved for coated throttle bodies, such as the 3M stuff. Regular carb cleaner and especially brake cleaner is too aggressive and could damage the coated throttle blade.

 

The IAC pintle valve could also be damaged by the wrong spray.

 

Don't spray too much in. The TPS is at the end of the throttle blade shaft and if you saturate everything the TPS might stop working.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted
Don't spray too much in.

 

Don't spray ANYTHING in if you have electronic throttle control. Soak the rag with cleaner and just wipe it out. Quite a few stalling problems are fixed by a simple cleaning of the throttle body.

 

Another thing that could cause the stalling like you described is the EGR valve sticking open or a torn EGR diaphragm, which causes a large vacuum leak.

Vacuum operated EGR's haven't been used for years though even the electronically controlled ones could possible stick. See that a LOT on the older 4.3 S trucks, but have never seen it on the C/K's.

 

BTW, never saw a 2001 Tahoe with a 5.7 in it.

budhayes3 Senior Enthusiast

budhayes3

Posted
Posted
Vacuum operated EGR's haven't been used for years though even the electronically controlled ones could possible stick.  See that a LOT on the older 4.3 S trucks, but have never seen it on the C/K's.

 

BTW, never saw a 2001 Tahoe with a 5.7 in it.

 

 

 

Oh yea, that's right. Actually, if there was an EGR problem, the PCM should pick up on it anyway...isn't there a code for EGR position or something? Thanks for the correction GM-Tech :thumbs:

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted
Oh yea, that's right. Actually, if there was an EGR problem, the PCM should pick up on it anyway...isn't there a code for EGR position or something? Thanks for the correction GM-Tech :thumbs:

 

 

 

 

Yes, there are a number of DTC's for the EGR and the PCM would pick up on it if something is wrong.

TUFFTRUX Enthusiast

TUFFTRUX

Posted
Posted

That happened with my 2000 5.0L gas too. When trying to make a slow tight turn (i.e. turning at an intersection) the engine would stall. It would also stall sometimes when moving in stop and go traffic. I changed out the EGR valve and the problem has completely disappeared my engine already had 175000 miles on it then now it has 189000.

budhayes3 Senior Enthusiast

budhayes3

Posted
Posted
If there a topic on changing the EGR valve out there?  Is it easy?  Any idea on the part number for a new EGR valve.  Dealer item only?

 

Mark

 

 

 

Well, like GM Tech was saying, on your truck the EGR is an electronially controlled solenoid, and if there was a problem with it you would more than likely have a check engine light. Did you try cleaning the throttle body yet?

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