5.7 chevy 1500 loses power

Asked by bobsyourdaughter Oct 20, 2012 at 11:10 AM about the 1996 Chevrolet C/K 1500 Cheyenne Extended Cab RWD

Question type: Maintenance & Repair

When i get on a hill and down shift the Engine loses power.
this truck had o2  sensor code with a vacccum leak that was
repaired. Fuel psi is 35. Could an o2senzor do this

3 Answers
69,085

John answered 11 years ago

Is it 35 at idle? While accelerating it should be closer to 45-50. If its 35 during acceleration its getting what's called fuel cut.

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Kurt answered 11 years ago

Does your truck seem hard to start or crank longer than normal? 1996-1999 vortec 5.7 require 60-66psi to start. Hook up fuel pressure gauge and just turn key on without starting it and check the pressure. Idle fuel pressure should be near 50psi, and under hard acceleration, should be back near 60psi. If you don't have enough pressure, 1st change the fuel filter, if that doesn't help, you need a fuel pump. Oh, and common sense here, make sure you don't have a leak somewhere.

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Joseph answered 10 years ago

having a problem with chevy votec 5.7. it runs fine till it gets to a moment where by it looses ecceloration and then it starts to run rough on less than 15 000RPM tryed the filters chacked all wires change the pedal sencor

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