CHEVY BAD MISS/BACKFIRE THROUGH INTAKE

1993 Chevrolet Truck

Tiny

MDORCEY

February, 15, 2009 AT 6:15 PM

Engine Performance problem
1993 Chevy Truck V8 Four Wheel Drive Automatic 300, 00 miles

I have tried setting the timing on my 93 Z71. I use the recommended method of unplugging the wire in the junction block and setting it to 0deg, or tdc, and when I plug the lead back in my timing jumps to about 35 or 40 deg, btdc and stays there, I have replaced the MAP, TPS, and IAC sensors as well as cap/rotor, plugs/wires, coil, injectors, fuel filter, and distributor, still no help

FOUND 1244 RELATED QUESTIONS

1 Answer

Tiny

Peter J. Maczik III

March, 16, 2009 AT 10:51 PM

Are you sure you got the right timing mark? My truck has two timing marks.

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