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09-28-2011, 03:09 PM
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#1 | |
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AF Regular
Join Date: Apr 2009
Location: rogers, Arkansas
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2001 cadillac sls pulses when a/c is on
Hello,
My 2001 cadillac sls will pulse up and down @ idle when the a/c is on. It does this constantly, not like when the a/c is engaging and dissengaging. It runs smooth when a/c is off. Thanks ellis479 |
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09-28-2011, 06:55 PM
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#2 | |
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A990 racer
 Join Date: Mar 2002
Location: Chestertown, New York
Posts: 16,950
Thanks: 25
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Re: 2001 cadillac sls pulses when a/c is on
The pcm is try to stabilize the idle, now as the compressor cycles the idle will vary slightly, if it is a gross change in speed, the throttle bodyand/or isc could be dirty or faulty ( the iac), a full scan may show something or an experienced tech can find out what's what.
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Last edited by maxwedge; 09-30-2011 at 03:30 PM. |
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| The Following User Says Thank You to maxwedge For This Useful Post: |
ellis479 (09-30-2011)
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09-30-2011, 01:13 PM
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#3 | |
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AF Regular
Thread starter
Join Date: Apr 2009
Location: rogers, Arkansas
Posts: 109
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Re: 2001 cadillac sls pulses when a/c is on
Maxwedge,
Thanks for the information. I couldn't figure out why it only fluctuates when the a/c was running. Once again it's not like the clutch cycling, much more rapid. Thank you ellis479 |
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01-10-2012, 01:27 PM
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#4 | |
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AF Regular
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Join Date: Apr 2009
Location: rogers, Arkansas
Posts: 109
Thanks: 20
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Re: 2001 cadillac sls pulses when a/c is on
Maxwedge,
I had the throttle body cleaned and the camshaft sensor replaced. This not only fixed the idle problem, but increased the gas milage dramatically. Thanks for your help...........Ellis479 |
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01-10-2012, 03:07 PM
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#5 | |
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A990 racer
Join Date: Mar 2002
Location: Chestertown, New York
Posts: 16,950
Thanks: 25
Thanked 371 Times in 365 Posts
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Re: 2001 cadillac sls pulses when a/c is on
Thanks for posting back results, did a scan show a cam sensor issue?
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