VACUUM LEAKS - USUSAL SUSPECTS

1999 GMC Sierra

Tiny

chrispassey1

December, 8, 2010 AT 5:43 PM

I am having real trouble with my Truck. I keep on hearing from mechanics and other knowledgable people that my problem could be because of Vacuum leaks in the Engine.
Now I understand (basically) the theroy of what they are getting at, but could someone tell me what they specifically mean? Also, could you tell me where in the Engine should I look and how many places are there where the seal could be leaking?
I guess what I am asking is who are the usual suspects?
Finally, is there any place online where I can see a picture (system diagram) of what they are talking about?

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4 Answers

Tiny

dennyp

December, 8, 2010 AT 8:04 PM

What is the problem you are having?

Tiny

chrispassey1

December, 8, 2010 AT 9:38 PM

The problem is that the Truck is stalling at a stop and it idling poorly. It almost sounds like it is choaking. I have replaced the Mass air filter, the spark plugs and ignition coils (I am not sure if the last two would be the cause) and I am hoping it isn't the catalytic converter. So before I hit that point, I decided to ask around and everyone I ask says it could be a vacuum leak. I just don't really know where to start.

Tiny

dennyp

December, 9, 2010 AT 1:36 AM

Start off by having it scanned for any trouble codes. If you don't have any codes, try cleaning the throttle body.
Use some throttle body cleaner and a toothbrush to scrub the carbon out of the inside of the throttle body opening.
Let me know if this helps.

Tiny

chrispassey1

December, 9, 2010 AT 2:40 PM

Thanks,
I will do that tonight and get back to you.

Thanks dennyp!

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