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

Your Answer

Add photo

Related Questions

Search Pontiac Sunfire Questions

Pontiac Sunfire Experts

#1 John Saffrahn
John Saffrahn
Reputation 2,670
#2 Joeyadams
Joeyadams
Reputation 1,310
#3 Warren0007
Warren0007
Reputation 1,230
View All

Related Models For Sale

Used Chevrolet Cavalier
1,070 listings
Used Pontiac Grand Am
1,268 listings starting at $1,595
Used Pontiac Firebird
6 Great Deals out of 739 listings starting at $2,500
Used Ford Mustang
377 Great Deals out of 47,158 listings starting at $1,999
Used Honda Civic
504 Great Deals out of 89,186 listings starting at $1,299
Used Pontiac Grand Prix
26 Great Deals out of 2,913 listings starting at $1,995
Used Chevrolet Impala
518 Great Deals out of 29,654 listings starting at $799
Used Chevrolet Camaro
149 Great Deals out of 32,800 listings starting at $1,995
Used Pontiac G6
54 Great Deals out of 4,173 listings starting at $699
Used Pontiac Solstice
11 Great Deals out of 423 listings starting at $4,495
Used Chevrolet Cobalt
50 Great Deals out of 3,934 listings starting at $1,498
Used Nissan Altima
845 Great Deals out of 79,903 listings starting at $2,000
Used Toyota Camry
849 Great Deals out of 90,626 listings starting at $850
Used Volkswagen Jetta
406 Great Deals out of 37,775 listings starting at $1,385
Used Chevrolet Malibu
862 Great Deals out of 81,264 listings starting at $995