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Missing when idling and under load

Tiny
MIKEHALE
  • MEMBER
  • 1994 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
My truck misses when idling and when your driving down the road, I did a compression test and all cylinders had around 165 psi, just installed new plugs and checked the dist cap roter and ignition module, wire and cap and roter was replaced last year
Wednesday, September 17th, 2014 AT 2:32 PM

5 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Heck for a vacuum leak at base of tbi unit at front and rear use choke cleaner and rpm changes it's leaking. Then check all hoses for being soft and leaking as well.
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Wednesday, September 17th, 2014 AT 3:20 PM
Tiny
MIKEHALE
  • MEMBER
  • 3 POSTS
I have already tried that, no change in idle
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Wednesday, September 17th, 2014 AT 4:18 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Then pull dist cap and check for carbon arcing as well as cracks and check plug wires 5000 ohms per foot including coil wire as that can go bac as well. Finally scan for codes.
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Wednesday, September 17th, 2014 AT 4:21 PM
Tiny
MIKEHALE
  • MEMBER
  • 3 POSTS
Well I checked the cap and roter, they looked fine, the wires were replaced awhile back but I guess they could be bad, what about a weak coil or ignition module?
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Thursday, September 18th, 2014 AT 12:16 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Y cold be that bu ti'm out of ideas so I have no further comments or suggestions.
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Thursday, September 18th, 2014 AT 12:33 PM

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