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

11,995

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

  • Fiero A/C Idle Problem 2 answers

    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, b...

    1988 Pontiac Fiero Formula

    -

    Maintenance & Repair

  • Fiero A/C 1 answer

    A/C, heater fan won't work

    1987 Pontiac Fiero GT

    -

    Maintenance & Repair

  • Fiero transmission 1 answer

    Can you put a manual 4 speed transmission from a 2.8 V6 Fiero into a 4cylinder fiero???

    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

  • I have a 1984 Potiac Fiero, Its a stick shift, Gear would not fall smoothly 1 answer

    My 1984 Fiero SE gear would not shift smoothly. Reverse gear is very hard. It is a well preseved car and it has only 24,500 miles on it.

    1984 Pontiac Fiero SE or Indy

    -

    Maintenance & Repair

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
13 Great Deals out of 756 listings starting at $2,995
Used Ford Mustang
698 Great Deals out of 44,786 listings starting at $1,500
Used Chevrolet Corvette
220 Great Deals out of 22,190 listings starting at $3,850
Used Chevrolet Camaro
354 Great Deals out of 31,416 listings starting at $2,400
Used Toyota MR2
17 listings
Used BMW 3 Series
1,026 Great Deals out of 31,544 listings starting at $1,000
Used Nissan 300ZX
134 listings starting at $3,995
Used Pontiac Grand Prix
24 Great Deals out of 2,804 listings starting at $1,995
Used Jeep Wrangler
266 Great Deals out of 15,898 listings starting at $3,200

Used Cars For Sale

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.