engine races all the time

5

Asked by May 10, 2013 at 12:02 PM about the Pontiac Sunfire

Question type: Maintenance & Repair

1 Answer

No check engine light? What year is it? Anything different happen before then after this problem? I suspect a vacuum leak, but devices being driven by the vacuum could be affected too--believe you've got a throttle-body injection system and has an amient air sensor which may or may not be working properly...see in the old days we used to have a thermal spring heat-riser that jacked up the idle speed with a cam while opening the butterfly valve, now with your TBI there needs to be a semblance of this function is done with an ambient air temperature sensor to make the decision combined with the coolant temperature is able to decide what the enrichment and throttle position should be in....so what I'm saying is it is out of our hands and need to make sure the computer is getting proper instructions from the sensors---~

Best Answer Mark helpful

Your Answer:

Pontiac Sunfire Experts

  • #1
    John Saffrahn
    Reputation
    2,980
  • #2
    Joeyadams
    Reputation
    1,420
  • #3
    Warren0007
    Reputation
    1,270
View All

Related Models For Sale

Used Pontiac Solstice
340 listings starting at $4,950
Used Pontiac Sunbird
10 listings
Used Pontiac G6
40 Great Deals out of 2,801 listings starting at $699
Used Pontiac Firebird
5 Great Deals out of 679 listings starting at $4,700
Used Ford Mustang
256 Great Deals out of 38,498 listings starting at $1,350
Used Pontiac Grand Prix
12 Great Deals out of 1,779 listings starting at $800
Used Pontiac Grand Am
726 listings starting at $1,900
Used Pontiac G5
5 Great Deals out of 319 listings starting at $995
Used Ford Focus
397 Great Deals out of 80,709 listings starting at $1,295
Used Honda Civic
407 Great Deals out of 49,585 listings starting at $1,495
Used Honda Civic Coupe
86 Great Deals out of 10,854 listings starting at $1,300
Used Saturn Sky
4 Great Deals out of 163 listings starting at $5,900
Used Pontiac G8
6 Great Deals out of 345 listings starting at $5,000
Used Chevrolet Camaro
240 Great Deals out of 27,311 listings starting at $2,077

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.