why does my truck shut off when idleing

danfield70
0

Asked by danfield70 Sep 19, 2012 at 02:58 AM about the 2003 Chevrolet Silverado 1500 LS Short Bed 4WD

Question type: Maintenance & Repair

when pressure is applied to the gas pedal, it runs fine but as soon as i take my foot off it starts to bogg down and shuts off. check engine light is not on and it now has trouble starting up

1 Answer

John Saffrahn
21,765

May be a vacuum leak a bad idle air control or a bad fuel pressure regulator. Since it won't idle it will be hard to check the idle vacuum. Start with the fuel pressure regulator. You will need a fuel pressure tester and a vacuum gun. Hook up the fuel pressure tester and turn the key on. Pressure should be around 60ish PSI, apply 15-20 inches of vaccum to the pressure regulator. The regulator should hold that vacuum till you let it off, and the fuel pressure should drop to 40-45 PSI. If it doesn't drop then the regulator is flooding the engine at idle. Replace it. If that tests good then pull out the idle air control and give it a good cleaning with carb cleaner and check for movement, reinstall and check how it idles. If it still idles bad then get a vacuum diagram and one by one remove the vacuum lines from the manifold, plug the hole with your finger, and have a friend start the truck. STAY CLEAR OF MOVING PARTS. Wear short sleeves no baggy cloths ties or necklaces tie up long hair if applicable. If one of them being removed allows the truck to idle then find the bad spot in the line or bad part and repair it. If neither of these work then the problem is quite possible a leak at the manifold somewhere or a burnt valve an injector stuck open and the list guess on. Try these easier steps first and let me know how it goes.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 califcarson
califcarson
Reputation 940
#2 dandyoun
dandyoun
Reputation 780
#3 tenspeed
tenspeed
Reputation 770
View All

Related Models For Sale

Used GMC Sierra 1500"
666 Great Deals out of 58,192 listings starting at $1,995
Used Ford F-150"
2,076 Great Deals out of 109,817 listings starting at $1,350
Used Dodge Ram Pickup 1500"
560 Great Deals out of 10,890 listings starting at $1,984
Used Chevrolet Silverado 2500HD"
411 Great Deals out of 30,182 listings starting at $2,725
Used Toyota Tundra"
376 Great Deals out of 17,420 listings starting at $2,299
Used Chevrolet Tahoe"
493 Great Deals out of 25,308 listings starting at $1,955
Used Toyota Tacoma"
557 Great Deals out of 25,017 listings starting at $2,598
Used Chevrolet Colorado"
168 Great Deals out of 8,775 listings starting at $2,995
Used Jeep Wrangler"
483 Great Deals out of 43,070 listings starting at $1,800
Used Chevrolet Silverado 1500HD"
10 Great Deals out of 251 listings starting at $4,995
Used Chevrolet Silverado 2500"
10 Great Deals out of 232 listings starting at $4,000
Used Chevrolet Camaro"
480 Great Deals out of 33,889 listings starting at $1,400
Used Chevrolet Avalanche"
236 Great Deals out of 4,852 listings starting at $2,900
Used Ford F-250 Super Duty"
568 Great Deals out of 38,611 listings starting at $2,500

Used Cars For Sale

2015 Chevrolet Silverado 1500 For Sale
146 Great Deals out of 97,172 listings starting at $20,991
2014 Chevrolet Silverado 1500 For Sale
178 Great Deals out of 9,847 listings starting at $16,995
2013 Chevrolet Silverado 1500 For Sale
229 Great Deals out of 6,471 listings starting at $12,950
2012 Chevrolet Silverado 1500 For Sale
156 Great Deals out of 4,618 listings starting at $9,995
2011 Chevrolet Silverado 1500 For Sale
149 Great Deals out of 4,713 listings starting at $8,995