Loss of power, backfiring, no DTC codes

Tiny
POFOLKSGOTTAWRENCHIT
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
'97 k1500, 5.7l vortec, 4l60e, about 100k miles on engine, 230k on body
starts and idles fine, gags and pops (like detonation with intake valve still open) at any throttle position, clears up immediately when you let off throttle (engine cold)--then, once engine is warm, you get fairly good (that's better than cold, but not at all good) throttle response up to exactly 3000 rpm, then it bogs, falls on its face, like timing is off. No DTC codes (on a cheap generic scanner). Cannot pull any kind of acceleration, or set a load moving.
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Sunday, July 13th, 2014 AT 5:28 AM

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Tiny
HMAC300
  • EXPERT
Check fuel pressure with a gauge 60-66 psi
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Monday, July 14th, 2014 AT 7:04 AM

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