Quote:
|
Originally Posted by Legendjet
i have a 91 silverado and i rebuilt the motor( top end valve stem seals). i put a muffler on it because it didnt have a muffler. i take it through inspection and it fails emissions this time. it has alittle smoke on start up but it doesnt continue after it gets hot. my emissions are as follow: hydrocarbons : standard 220 ppm test showed 1,700 ppm my carbon monoxide; standard 1.20% test showed 1.72% i think that means i have a few cylinders that have no fire because of the hydrocarbons being so high gas is going in and going out unburned i think i started pulling plug wires which are new and #1 i got a huge spark #3 5 7 i got alittle spark. pluge wires, plugs, distributor cap and rotor are all new. im trying to figure this out before i have to spend a fortune getting it fixed. if any one can give me any advice please do so thank you  |
Switch plug wires . try the one that has good spark where you have little spark.
If that does not help check the dist shaft for a worn out bushing.
Check for sideways play or crack striker plate in it.
And make sure cap /rotor are not bad.
MT