Question about 2003 Chevrolet TrailBlazer

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When A/C is activated the engine stalls. When A/C is not activated the car runs normal. Is this problem my high speed idle sensor?

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  • aznunu888 Jul 12, 2009

    When the RPM is raised and the A/C is activated the engine continue running but when I release the accelerator back to normal RPM and activate the A/C then engine dies.

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  • Chevrolet Master
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You have a dirty IDLE AIR CONTROL VALVE (IAC). It is a part of your throttle body assembly. Buy a can of Throttle body Cleaner. Remove the air snorkel from your air cleaner to expose the throttle body. Follow the instructions on the can and use the whole can, this should dislodge the carbon and dirt that is causing you issues. After the good cleaning time to relearn the IAC it's base line, with every accessory off. a. turn key on (but don't crank) for 30 seconds, then b. turn key off for 30 seconds, then c. crank and let engine idle for 5 minutes During "part c", the OBD apparently adjusts the IAC pintle position to get the 500-600 RPM curb idle.
The other suggestion is you first remove the IAC valve from the throttle body and thoroughly clean the valve and passageways. Use a throttle body cleaner spray. With the IAC off, spray some of the cleaner directly into your throttle body as per the instructions on the can. If this doesn’t cure the problem, the IAC valve itself may need replacing or the wires may be damaged. If the IAC is OK, I would also check the EGR valve for carbon buildup. This valve also tends to choke up with carbon deposits over time and cause erratic idle and stalling by sticking in the up position. Again, disconnect the EGR valve, clean with the throttle body cleaner spray and replace it.
Good luck and hope this helps, ether way should work, one is just more in depth then the other. Keep me posted and as for the second suggestion you still have to reset the IAC as the first suggestion.

Posted on Jul 12, 2009

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  • Expert
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You can check. hold the throttle at ablut 2000 rpms then turn the ac on. if the car still stall that means the compressor is froze. when the relay kicks the clutch on the pump stalls the engine

Posted on Jul 11, 2009

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