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good tuneup rough a/c Idle
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jab
New User
Aug 15, 2008, 7:35 PM
Post #1 of 2
(1400 views)
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good tuneup rough a/c Idle
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 I recently put a tuneup on my 1989 chevy celebrity. It ran fine until i turned on the a/c thats when my problems started.
now it runs rough at Idle and trying to keep up with traffic is an adventure. it drinks gas like it was a slerpy.
it shakes real bad above 40 mph until i floor it then it runs fine until i reduse speed.
please help! larry.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 16, 2008, 3:31 AM
Post #2 of 2
(1394 views)
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Re: good tuneup rough a/c Idle
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Questions:
Was this tune up just routine or for a specific problem?
Was the A/C touched at all when it was tuned up? Not normally part of a tune up to check A/C unless you requested that.
Is it ok if you don't use the A/C?
Does the A/C blow predicatably cool air for you now?
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The link of A/C and how the car runs is that it is an extra load that the engine must cope with AND it forces the fan underhood on when requested. You might notice slight loss of HP vs when not used but that's about it. Otherwise it's not part of the performance and smoothness of the running of the engine - NORMALLY.
It would be unusual for an '89 car to not have had something done to the A/C since new. Many would now be converted to use 134a (the current OE refrigerant nor new cars since switch year of 1993) by now - was it?
Not sure if the A/C is the source problem with this if it ran fine before tune-up and wasn't touched.
Please explain more on just what got you to this point so we can help or suggest what to do,
T
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