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2003 Chevy Silverado idle problem

Tiny
LAKERFAN
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
I have a 03 chevy silverado 5.3 V8 automatic 2 wheel drive. My battery was dead after a couple days of the truck not being driven and I replaced the battery now it has a very low idle and stalls. Checked fuel lines, spark pluggs, wires and still has the problem
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Saturday, November 21st, 2009 AT 7:23 PM

7 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
First thing I would do is clean the throttlebody, and MAF, then drive it, the PCM needs to relearn your driving habbits.
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Saturday, November 21st, 2009 AT 7:25 PM
Tiny
LAKERFAN
  • MEMBER
  • 4 POSTS
I cleaned throttle body and MAF drove it around for awhile. The truck idles fine now, but when I go to take off or stop at a light or sign it bogs down and attemps to die on me
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Thursday, November 26th, 2009 AT 3:08 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Let me ask if you have an aftermarket oiled air filter on this truck, not only does Chevy have a Tech bulliten on it, but I have replaced several MAF sensors for this, even though no codes are present. Engines always run like new after plugs wires and MAF replacement, along with throttlebody service.
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Friday, November 27th, 2009 AT 8:41 AM
Tiny
LAKERFAN
  • MEMBER
  • 4 POSTS
Yes I do have a K&N air filter and intake on the truck
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Friday, November 27th, 2009 AT 12:00 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Cleaning MAF Doesnt work on most of these apps, replace MAF!
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Friday, November 27th, 2009 AT 12:07 PM
Tiny
LAKERFAN
  • MEMBER
  • 4 POSTS
I did replace MAF today the problem cleared up pretty good, but I do get a llittle bogging down here and there especially when I slowly turn in to corners dont know if that tells you anything. I also bought plugg wires but havent put them in yet. I will let you know what happens after I put the wires in.
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Friday, November 27th, 2009 AT 7:21 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
At 90,000 mile replace BOTH plugs and wire! Rest of yur problem could be due to these tune up parts!
GM calls for plugs at 100,000 miles, but usually shown symtoms before that! Also this: You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! If that doesnt do it, you may need a new idle air control valve, it's bolted to the throttlebody
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Saturday, November 28th, 2009 AT 8:41 AM

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