Question about 2000 Chevrolet Silverado

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1999 silverado 115k-skipping,no power almost won't go under had excelleration.Not shifting right,bucking,numb.Had po171 and misfire codes-which it has had off and on for three years. Finally changed bank 1 s2 02 sensor. Scanned misfire codes-#2,3,4,5,6. Change spark wires,3,5,ok now.Changed coil and injector on #2,4. #6 still looks odd. Now can almost not make it home.#2 has 3000+ misfire.Sprayed around all injectors,intake,found no leaks. Money is used up, I can't figure this out on my own,any help.This is a service truck so it is needed all the time,hard to live without this truck.Had to use wifes car last night,that didn't go over well.Just to add that this truck gets a regular maintainence schedule.Filters,fluids,belts,etc.Thanks Wtb3rd.

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  • beep73 Mar 13, 2009

    Thanks guys, after changing fuel pump due to 48 psi (was told it should be 55psi and higher) ,and alot more testing ,we discovered that the cats are at 17% efficiency.Will change out cat system soon and let everyone know how it works out.Thanks again to the tech that took the time and actually helped me, I will return the help if I can.

  • beep73 Mar 13, 2009

    Thanks, after changing fuel pump, had 48 psi, we discovered cat efficienc was at 17%. Will change system out and Iwill let everyone know if that cured problem. thanks again for the help.



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Look into a Catalytic converter issue

Posted on Mar 10, 2009


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