why does my truck shut off when idleing

Asked by 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

33,375

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.

4 out of 4 people think this is helpful.

Your Answer

Add photo

Related Questions

Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 2,140
#2 Rowefast
Rowefast
Reputation 1,800
#3 Silverado_owner_2006
Silverado_owner_2006
Reputation 1,610
View All

Related Models For Sale

Used GMC Sierra 1500
801 Great Deals out of 67,044 listings starting at $1,499
Used Ford F-150
2,258 Great Deals out of 209,448 listings starting at $1,499
Used Dodge Ram 1500
453 Great Deals out of 11,387 listings starting at $700
Used Chevrolet Silverado 2500HD
306 Great Deals out of 27,045 listings starting at $1,250
Used Toyota Tundra
489 Great Deals out of 34,174 listings starting at $3,000
Used Toyota Tacoma
519 Great Deals out of 39,893 listings starting at $1,995
Used Chevrolet Tahoe
584 Great Deals out of 27,619 listings starting at $1,500
Used Chevrolet Colorado
223 Great Deals out of 23,589 listings starting at $1,395
Used Chevrolet Camaro
151 Great Deals out of 32,742 listings starting at $1,729
Used Ford F-250 Super Duty
337 Great Deals out of 47,710 listings starting at $1,495
Used Chevrolet Silverado 2500
8 Great Deals out of 295 listings starting at $3,000
Used Chevrolet Silverado 1500HD
12 Great Deals out of 270 listings starting at $3,950
Used Ford Mustang
396 Great Deals out of 47,365 listings starting at $1,999

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
44 Great Deals out of 116,248 listings starting at $20,542
2016 Chevrolet Silverado 1500 For Sale
131 Great Deals out of 6,047 listings starting at $20,499
2015 Chevrolet Silverado 1500 For Sale
179 Great Deals out of 7,270 listings starting at $15,888
2014 Chevrolet Silverado 1500 For Sale
280 Great Deals out of 10,432 listings starting at $9,988
2013 Chevrolet Silverado 1500 For Sale
154 Great Deals out of 5,112 listings starting at $7,650