Wont idle have 2 pump gas pedal 2 keep it running

Tiny
JARET
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 252,000 MILES
94 7.3 backfires through tb, replaced map sensor, tps, fuel pump, cap& rotor, wires truck is a 1 ton with 7.3
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Wednesday, November 16th, 2011 AT 11:52 PM

2 Replies

Tiny
ASEMASTER6371
  • EXPERT
Sounds like the camshaft has worn out. Common on the old engines. Soft material and when they wear out, they backfire through the throttle body.

This is assuming your plugs, wires, cap and rotor are all good.

Roy
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Wednesday, November 16th, 2011 AT 11:55 PM
Tiny
RASMATAZ
  • MEMBER
If it comes down to the camshaft best replace the valve lifters too-their partners in crime-they work as a team-same goes with the cap and rotor on conventional ignition system-
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Thursday, November 17th, 2011 AT 12:04 AM

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