My 2001 Pontiac Sunfire hesitates, jerks on hot humid days. Worst when I accelerate and the A/C is on. Also the gas gage quit working. What could be wrong?

Asked by Jul 20, 2013 at 05:57 PM about the 2001 Pontiac Sunfire

Question type: Maintenance & Repair

We have been to 3 mechanics.Replaced the gas cap, fuel pump, ignition cord,fuel filter, spark plugs w/wires and the problem still isn't fixed.

1 Answer

74,225

Is your "check engine" light on? If so, have the computer scanned and post the trouble code(s) here. That will be a big help. With the engine idling switch on the A/C. The engine should speed up a bit to compensate for the added load of the A/C compressor. If it doesn't that means the IAC (idle air control valve) isn't working correctly. Or the computer isn't getting the "A/C request signal" when the air conditioning is switched on. As for the gas gauge, check the wiring back by the tank. Sounds like a bad connection. This may be causing the engine problem too. You have a vent valve (electronic) that is incorporated in with the fuel pump module. As is the gas gauge sending unit. If this vent valve isn't working it can cause drivability problems and should cause your "check engine" light to come on as well. HTH. -Jim

Your Answer

Pontiac Sunfire Experts

  • #1
    John Saffrahn
    Reputation
    2,890
  • #2
    Joeyadams
    Reputation
    1,400
  • #3
    Warren0007
    Reputation
    1,260
View All

Related Models For Sale

Used Chevrolet Cavalier
768 listings starting at $400
Used Pontiac Firebird
7 Great Deals out of 726 listings starting at $3,988
Used Jeep Cherokee
435 Great Deals out of 57,061 listings starting at $2,500
Used Toyota Corolla
859 Great Deals out of 65,454 listings starting at $1,250
Used Pontiac Bonneville
430 listings starting at $1,500
Used Pontiac Grand Am
939 listings starting at $2,489
Used Chevrolet Silverado 1500
2,961 Great Deals out of 161,304 listings starting at $1,295
Used Honda Civic
698 Great Deals out of 53,267 listings starting at $1,495
Used Mitsubishi Eclipse Spyder
7 Great Deals out of 456 listings starting at $2,300

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.