Error_234

What exactly do you mean "move the wires so they don't arch". Elaborate please?

A Peter C4

Try to keep wires away from each other and away from any grounding metal with plastic wire looms and wireties, so wires do not touch each other or ground out on motor or exhaust manifolds.

Error_234

that has already been done. i used the original wire looms in the car and zip tied them from being near any metal or hot surfaces. Thanks for the explanation.

Cruisinfanatic

what are they arching against?

Error_234

they are arching where the wire boot connects to the spark plug. Arching on the motor block itself.

Cruisinfanatic

are they all the way on? Hear the snap?

MatthewMiller

I know you said you recently replaced the plugs, and they were pre-gapped. I would suggest going back and gapping them yourself at 0.035" instead of the larger specific gap. That is plenty of gap to ignite the mixture, and will make it easier for the spark to arc across that gap instead of where you don't want it to arc.

Error_234

yes they are all the way on. I even rechecked them to make sure.

Error_234

thats my next step. thanks for the suggestion

mrodoc

The oil smelling like gas seems to have been ignored. Suggest compression testing all cylinders.

Error_234

good idea, since I'm pulling the plugs anyway might as well check to see. I wouldn't think it's that because it so subtle but it's always good to eliminate that from the equation. Waiting on some parts and will update in a couple days

mrodoc

I was just thinking of the mechanism of gas getting into oil. Through the rings is a prime candidate. I would think this would give you low compression or at least it would show up on leak-down test. Of course there are other causes of bad compression test, such as bad valves. This may have nothing to do with the miss. It's just that gas in the oil can wipe out parts such as bearings so you will want to track this down if it persists.

Cliff Harris

I think you have a ruptured fuel pressure regulator diaphragm. That will allow fuel to go into the plenum. It then runs down the runners and into the cylinders. From there it works it's way around the rings and into the oil.

Error_234

that has already been changed. Thanks for the siggestion

Error_234

UPDATE. Changed plugs and wires again. check gap on old plugs all but one was .5 the other being .6. thought that might of been the issue but miss is still there. Compression check was done also and everything was within specs. lowest reading was 190 the highest being 207. all other were around 205. barely within specs but still within 10%. i could not get a check on cylinder 8 (passenger back plug). I went with Taylor wires this time.

so this is where i stand. still with a slight stumble/misfire. i drove it over the weekend and going to check over everything today. what about the PCV? would this cause these issues also?

Cliff Harris

Several years ago GM reduced to spark plug gap spec from 0.045 to 0.035 because of misfires. Try a smaller gap and see how that works for you.

A Peter C4

You say plugs are .5, do you mean .050, if so that's to big of a gap, try .035 to .038.

Error_234

I dont have any arching issues anymore since changing the plugs and wires again. but stumble still continues.