Fiero A/C Idle Problem

10

Asked by Jul 19, 2011 at 05:39 AM about the 1988 Pontiac Fiero Formula

Question type: Maintenance & Repair

I own an 88 Formula, manual. Right when I turn on my compressor sometimes it
drops my idle so low it kills the car. This happens usually when I turn on the
compressor right when I turn the car on, but sometimes when I down shift from
third to second, or if I push the clutch in, in first if Im above maybe 2000rpm.
Sometimes it dies even in higher gears, though, I just think i notice it more in the
lower ones. I've replaced the IAC in hopes that it would fix the problem, but
didn't. Any ideas?

2 Answers

11,845

Couple of things pop into mind right away. Check the throttle bore for coking ( carbon deposits ) Check to see if the computer is seeing the AC "ON" signal If everything looks okay - Try a battery clear - Remove both terminals on the battery and hold them together for about 30 seconds and reconnect - Start the car and immediately turn the steering wheel all the way to the stop and hold there for a few seconds and straighten.With Out the AC on take the car for a ride at 40 miles an hour for about 5 minutes and return. Then Put AC on - And turn steering wheel all the way to the stop and hold for a few seconds. Straigten wheel and take it for a ride and see how it does now.

1 of 1 people found this helpful.
265

The idle air step motor is located on the throttle body, it is a good possibility it has quit working or has gotten stuck. It's job is to increase and decrease the amount of air that leaks around the throttle plate when the throttle is closed and the engine comes under load like from the A/C starting and stopping.

Your Answer

Add photo

Related Questions

  • High Idle 2 answers

    My fiero developed a high idle problem, idle near 3k, I have checked for vacumn leaks, throddle body is ok and have replaced the throddle position sensor, any help would be appreciated....thanks

    1985 Pontiac Fiero GT

    -

    Maintenance & Repair

  • 86 Pontiac Fiero GT bogging down 2 answers

    The past couple days when I'm driving home and I press the gas my car starts to bog down and then acts like it's going to die but doesn't if I go slow maybe 20 miles an hour my car is fine but if I...

    1986 Pontiac Fiero GT

    -

    Maintenance & Repair

  • Looking for a Recommendation for a Fiero Mechanic in the Detroit, MI area. 3 answers

    I just purchased a 1987 Fiero GT. It's in excellent condition although, it needs some mechanical work. Can anybody recommend a mechanic in northern Oakland County / Detroit Area that has Fiero experie...

    1987 Pontiac Fiero GT

    -

    Maintenance & Repair

  • 1985 Fiero GT has a short somewhere. 3 answers

    1985 Fiero GT will start and run but if discharges the battery over night must have a short somewhere, but not sure where to start looking. Someone told me that they were bad for having shorts consol...

    1985 Pontiac Fiero GT

    -

    Maintenance & Repair

  • What do you think of the Pontiac Fiero? 3 answers

    What do think overall of a Pontiac Fiero? What are the positives? What are the negatives? Any other comments? Thanks

    Pontiac Fiero

    -

    Shopping & Pricing

Search Pontiac Fiero Questions

Pontiac Fiero Experts

#1 Andrew Welsh
Andrew Welsh
Reputation 230
#2 THORNY68
THORNY68
Reputation 220
#2 Steve Neyens
Steve Neyens
Reputation 220
View All

Related Models For Sale

Used Pontiac Firebird
12 Great Deals out of 724 listings starting at $3,990
Used Ford Mustang
470 Great Deals out of 45,735 listings starting at $1,999
Used Chevrolet Corvette
119 Great Deals out of 20,753 listings starting at $3,000
Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Mazda RX-7
61 listings
Used Nissan 300ZX
129 listings starting at $3,995
Used Toyota MR2
20 listings
Used Dodge Charger
405 Great Deals out of 28,172 listings starting at $1,988
Used BMW 3 Series
972 Great Deals out of 31,729 listings starting at $1,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.