Fiero A/C Idle Problem

echohawk70
10

Asked by echohawk70 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

Mike Bonnell
8,655

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 out of 1 people think this is helpful.
Steve Neyens
185

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

  • Hard Start with High Idle 3 answers

    1984 Fiero SE Automatic. This one is driving me crazy! I has spend about $1,000 in parts and repair time at a local shop. Car always had a bit of a high idle (about 2,000 RPM), but I could live with...

    1984 Pontiac Fiero SE or Indy

    -

    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

  • where can i get a diagnostic tool you can hook up to a computer? 5 answers

    diagnostic tools at the parts stores will not read my car. 1988 Fiero Formula- having issues with it totally dying while driving, idle and freeway. give it a little time and it starts again.

    1988 Pontiac Fiero Formula

    -

    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 dandyoun
dandyoun
Reputation 170
#2 Andrew Welsh
Andrew Welsh
Reputation 160
#3 THORNY68
THORNY68
Reputation 140
View All

Related Models For Sale

Used Ford Mustang"
613 Great Deals out of 33,963 listings starting at $1,595
Used Chevrolet Corvette"
283 Great Deals out of 10,347 listings starting at $2,999
Used Pontiac Firebird"
19 Great Deals out of 676 listings starting at $1,600
Used Chevrolet Camaro"
480 Great Deals out of 33,889 listings starting at $1,400
Used Honda Civic"
779 Great Deals out of 60,883 listings starting at $1,200
Used Toyota MR2"
23 listings
Used Pontiac Grand Prix"
114 Great Deals out of 3,989 listings starting at $850
Used Pontiac Grand Am"
19 Great Deals out of 1,924 listings starting at $1,500

Used Cars For Sale