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
16,115

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.

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • What would cause no power - only code is 0300? 1 answer

    I was going down the interstate at about 72 mph and all was well. Then the truck started loosing power. By the time I got it off the interstate (about 1 mile) Foot to the floor, doing about 15 mph. ...

    2006 Chevrolet Silverado 1500 Work Truck 4WD

    -

    Maintenance & Repair

  • 2006 GMC Sierra with the 4.3. No power, had to be towed, only code is 0300 random misfire. 1 answer

    I was going down the interstate at about 72 mph and all was well. Then the truck started loosing power. By the time I got it off the interstate (about 1 mile) Foot to the floor, doing about 15 mph. ...

    2006 Chevrolet Silverado 1500 Work Truck 4WD

    -

    Maintenance & Repair

  • Engine Shutting off after about 10-20 seconds on 2004 Silverado 1500 20 answers

    Can anyone shed some light on this problem. After driving my 04' Silverado 1500 all day without any problems, after the truck sat in the driveway for a couple of hours, the truck started right up, but...

    2004 Chevrolet Silverado 1500

    -

    Maintenance & Repair

  • my oil pressure gauge drops to 0 while driving 19 answers

    While driving my oil pressure gauge randomly drops down to 0. I have to pull over and shut off my truck for a minute or so and restart it. The gauge goes up a little or some times back to normal. How...

    2003 Chevrolet Silverado 1500 Ext Cab Short Bed 4WD

    -

    Maintenance & Repair

  • Car shuts off in gear 1 answer

    When I start my car, it runs ok in park but everytime I try to put it in gear it's shuts off. Do you know why?

    1993 Chevrolet Cavalier

    -

    Maintenance & Repair

Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 tenspeed
tenspeed
Reputation 460
#2 califcarson
califcarson
Reputation 440
#2 Andrew Olsen
Andrew Olsen
Reputation 440
View All

Related Models For Sale

Used GMC Sierra 1500"
974 Great Deals out of 61,295 listings starting at $990
Used Ford F-150"
2,595 Great Deals out of 168,952 listings starting at $1,495
Used Dodge Ram Pickup 1500"
847 Great Deals out of 15,178 listings starting at $1,222
Used Chevrolet Silverado 2500HD"
548 Great Deals out of 39,531 listings starting at $2,995
Used Toyota Tacoma"
554 Great Deals out of 21,170 listings starting at $2,199
Used Toyota Tundra"
531 Great Deals out of 25,726 listings starting at $2,995
Used Chevrolet Tahoe"
1,007 Great Deals out of 33,065 listings starting at $2,500
Used Chevrolet Silverado 1500HD"
17 Great Deals out of 315 listings starting at $5,000
Used Chevrolet Colorado"
238 Great Deals out of 5,689 listings starting at $2,950
Used Chevrolet Silverado 2500"
10 Great Deals out of 332 listings starting at $4,000
Used Chevrolet Camaro"
591 Great Deals out of 28,177 listings starting at $1,795
Used Chevrolet Avalanche"
339 Great Deals out of 5,999 listings starting at $3,999
Used Jeep Wrangler"
959 Great Deals out of 44,750 listings starting at $1,800
Used Ford F-250 Super Duty"
677 Great Deals out of 34,554 listings starting at $2,500

Used Cars For Sale

2014 Chevrolet Silverado 1500 For Sale
273 Great Deals out of 89,831 listings starting at $18,754
2013 Chevrolet Silverado 1500 For Sale
401 Great Deals out of 7,404 listings starting at $13,250
2012 Chevrolet Silverado 1500 For Sale
350 Great Deals out of 6,218 listings starting at $8,495
2011 Chevrolet Silverado 1500 For Sale
353 Great Deals out of 7,505 listings starting at $8,000