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Old 09-17-2011, 10:29 AM   #1
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A/c

Recently I noticed when the a/c is on and I stop at a light my car stalls. Any idea on what that could be?

---------- Post added at 11:29 AM ---------- Previous post was at 11:29 AM ----------

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Originally Posted by Meansaleen
Recently I noticed when the a/c is on and I stop at a light my car stalls. Any idea on what that could be?
Sorry. 1989 supercharged 5.0
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Old 09-17-2011, 11:22 AM   #2
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Your ac Compressor could be going bad and is putting excessive resistance on the engine or you could have a vacuum leak in the controls.
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Old 09-17-2011, 11:49 AM   #3
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Quote:
Originally Posted by Mustangsandiron
Your ac Compressor could be going bad and is putting excessive resistance on the engine or you could have a vacuum leak in the controls.
I do get a surging idle could the vacuum from the a/c cause that?
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Old 09-17-2011, 12:04 PM   #4
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It's possible. To test it you need to disconnect the vacuum line from the intake and cap the connection and see how the engine responds.
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Old 09-17-2011, 03:50 PM   #5
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Re: A/c

Something should kick the idle up a bit when the A/C is on to compensate for the drag on the engine.
For the life of me I cannot remember right now what does it on these cars.
Buy a Chilton or Haynes manual and look it up.
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