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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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1994 chevy p/u will start and has decent idle but backfires

Customer Question

1994 chevy p/u will start and has decent idle but backfires if I acccelarate a lot. The main issue I have is that when I put it in gear it loses power, backfire, won't go past 40mph,won't go uphill. I have replaced fuel filter,pump,spark plugs and wires and the complete throttle body.
JA: Is the power loss consistent, or does it fluctuate?
Customer: consistent
JA: What is the model of your '94 Chevy?
Customer: 1500, v6 vortec 4.3l
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Yes, I put in a complete T.B, fuel filter, fuel pump, spark plugs, spark plug wires, check for vacuum leaks and reset timing.
JA: Anything else you want the mechanic to know before I connect you?
Customer: The truck was not run for 2years, so I put new battery and replace the old, stinky, discolored fuel.
Submitted: 6 months ago.
Category: Chevy
Expert:  Eddie replied 6 months ago.

Hello, and thanks for your question, my name is ***** ***** I will do all I can to help.

Expert:  Eddie replied 6 months ago.

It kind of sounds like a classic case of plugged catalytic converter to me. Can you pull the front 02 sensor out, and see if that helps any. or Is the check engine light on now by chance? thank you.

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