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Engine starts and idles fine

Tiny
FENN49
  • MEMBER
  • 1996 CHEVROLET CHEYENNE
  • 110,000 MILES
Engine starts and idles fine. Sputters and backfires when in gear and accellerating. I can accellerate gradually but will not after heating up from driving at speed for a distance. Acts like cats but had them replaced. Any thoughts. Plugged muffler. Other?
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Wednesday, April 10th, 2013 AT 3:49 PM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure first then check vacuum at idle if 15" or below suspect clogged exasust also check for vacuumleak.
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Sunday, April 14th, 2013 AT 10:16 AM
Tiny
FENN49
  • MEMBER
  • 5 POSTS
Thanks hmac300. Have now replaced entire exhaust and rotor in distributer. Tech scanned and also checked for vacuum leak and none detected. Says he can't figure out what the problem is. Any other suggestions? Do you think plugs might help?
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Wednesday, April 24th, 2013 AT 7:42 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Was a compression test done? If so what are the readings? What engine is in this? It could be the spider in the intake but send me the other stuff first.
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Wednesday, April 24th, 2013 AT 7:45 AM
Tiny
FENN49
  • MEMBER
  • 5 POSTS
350 vortec. They said they did a compression test but I don't have the numbers. The truck will excellerate steadily but you can't jump the gas. Also loses power on hills
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Wednesday, April 24th, 2013 AT 7:58 AM
Tiny
FENN49
  • MEMBER
  • 5 POSTS
This truck was also driven for quite some time with at least one bad cat?
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Wednesday, April 24th, 2013 AT 8:04 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
What's the fuel pressure if it's not 60-66psi then replace the pump and filter. That was the first thing I suggested but no answer on that.
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Wednesday, April 24th, 2013 AT 8:05 AM
Tiny
FENN49
  • MEMBER
  • 5 POSTS
Okay. Thanks.I'll let you know how I make out!
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Wednesday, April 24th, 2013 AT 8:09 AM

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