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Will not run smoothly

Tiny
JOHNNY COLLINS
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Truck stopped running while driving down the road, towed it home. Put a complete tune up on it still idle bad a buddy came over and scanned it he said that the crankshaft sensor was bad.I replaced it still will not idle smoothly. Why?
Monday, May 15th, 2017 AT 1:29 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try cleaning throttle plate on both sides and IAC hole with choke cleaner. This may be an injector problem as GM changed a lot of them due to poor running qualities. Also check for a vacuum leak. Like hoses. O-ring leaks around plenum and scan for codes.
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Monday, May 15th, 2017 AT 3:48 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,070 POSTS
Hello,

If the rough idle seems to be consistent then I would do a compression test to see if you have one low cylinder.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run this test and get back to us so we can continue helping you.

Cheers, Ken
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Thursday, May 18th, 2017 AT 10:56 AM

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