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Dan, ASE Certified Technician
Category: Chevy
Satisfied Customers: 1694
Experience:  Auto Technician
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2006 Silverado Question. If I crank my truck with no ac on,

Customer Question

2006 Silverado Question. If I crank my truck with no ac on, it idles and runs fine. As soon as I turn ac on, engine runs very rough, starts to burn very rich, smoke from exhaust. If I turn engine off and then back on without ac, it runs fine. I can run ac with no problem once highway speed is reached, but must turn it off before I drop below 60 mph, or it starts running very rough and bogs down..I have taken it to two different shops and they are all scratching there heads...
Submitted: 1 year ago.
Category: Chevy
Expert:  Dan replied 1 year ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.

Expert:  Dan replied 1 year ago.

I wonder if the compressor is binding putting a large load on the engine.

Customer: replied 1 year ago.
Everything appears fine on compressor according to tech's who have looked at it...
Customer: replied 1 year ago.
Not able to take calls presently
Expert:  Dan replied 1 year ago.

Maybe this is a voltage problem with the alternator. When ac is on its putting a load on the battery. I would check charging system voltage at idle with the ac on.

Expert:  Dan replied 1 year ago.

Low voltage would cause the engine to run rough.

Expert:  Dan replied 1 year ago.

Hello again Dan here,

I am contacting you because the post has not been closed or rated.

This question is coming up on 7 days which means it will time out and close.

You have already paid to get this question answered, but you have not rated.

Let me help some more. Is there anything else I can help you with?

If I did not give you 5 star service, please let me know what I missed.

I do not get compensated for my time and resources unless you rate me.


Customer: replied 1 year ago.
Sorry for the delayed response to you. I was frustrated as I was getting the same answers from you that I had from local mechanics. I was able to finally track down the problem and you can use this information if you want. The culprit turned out to be in the blue connector on the PCM. The bottom 6 pins were corroded with what looked like some kind of wet mud. I cleaned the connectors applied a liberal coat of dielectric grease and presto....
Expert:  Dan replied 1 year ago.

Some things are difficult to diagnose over the computer without being there to look at things.

Glad you were able to figure this out!