Back firing through TBI and transmission not shifting out of first gear while driving

Tiny
JOE1194
  • MEMBER
  • 1995 CHEVROLET SUBURBAN
  • 7.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 380,000 MILES
I have replaced plugs wires cap rotor shift solenoids and wires in transmission, ECM new, fuel filter new, injectors, new fuel pump, and it still will not shift out of first when going down the road. It falls on its face off the line and backfires through the tbi only on the passenger side of the tbi. It didn't do it every time I drove it until just recently. Oh, and the TPS has also been replaced. Please help, and thank you.
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Monday, March 15th, 2021 AT 12:12 AM

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Tiny
ASEMASTER6371
  • EXPERT
Good morning,

I would start with a compression test. Backfiring is usually from a timing issue or a possible valve issue.

https://www.2carpros.com/articles/engine-backfires-while-running

https://www.2carpros.com/articles/how-to-test-engine-compression

If the compression is good, take off the valve cover and watch the valve movement while running to be sure all the valves are moving the same distance. They had issues with the camshafts wearing down and the valve movement being effected.

Roy

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Monday, March 15th, 2021 AT 2:15 AM

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