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

11,225

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.
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

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Pontiac Fiero Experts

#1 Steve Neyens
Steve Neyens
Reputation 220
#1 Andrew Welsh
Andrew Welsh
Reputation 220
#3 THORNY68
THORNY68
Reputation 200
View All

Related Models For Sale

Used Pontiac Firebird
18 Great Deals out of 808 listings starting at $3,000
Used Chevrolet Corvette
291 Great Deals out of 20,422 listings starting at $3,688
Used Ford Mustang
583 Great Deals out of 41,215 listings starting at $1,699
Used Chevrolet Camaro
475 Great Deals out of 39,921 listings starting at $3,499
Used Toyota MR2
17 listings
Used Porsche 911
128 Great Deals out of 4,469 listings starting at $8,901
Used Pontiac Grand Prix
19 Great Deals out of 3,814 listings starting at $900
Used Ford F-150
3,213 Great Deals out of 205,088 listings starting at $1,779
Used Jeep Wrangler
490 Great Deals out of 17,959 listings starting at $2,950
Used Porsche 944
95 listings

Used Cars For Sale