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STUMBLING BAD AROUND 45, WILL STILL STUMBLE AROUND AT 75 OR 80

Tiny
JEHANEY1946
  • MEMBER
  • 1998 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 350,000 MILES
HAVE REP. LACED DISTRIBUTOR, ELECTRONIC SPARK CONTROL. CHECKED TPS. REPLACED FUEL INJECTORS, DID INJECTOR BALANCE TEST, FUEL PRESSURE TEST
DID A MANUAL RELEARN/ PULLED FUEL PUMP RELAY. STILL RUNS. CHECKED ALL GROUNDS.



Wednesday, July 1st, 2015 AT 10:13 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Are there any codes and what was fuel pressure? Did fuel pressure hold at least 10 psi after shutdown?
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Wednesday, July 1st, 2015 AT 10:23 AM
Tiny
THIS IS MIKE
  • MECHANIC
  • 686 POSTS
JEHANEY1946
July 2, 2015.

55 to 57 pounds yes hold pressure within 10 pounds also have installed new a/c plugs and wires, also put a data logger on it and it has no miss. Will stumble and rpm doesn't change.
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Thursday, July 2nd, 2015 AT 1:34 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Fuel pressure should be 60-66 psi with 60 being minimum. Looks like it needs a fuel pump
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Thursday, July 2nd, 2015 AT 5:08 PM

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