my mods r listed below, i also have all new ignition parts stock coil accel cap rotor taylor 8mm spirocore wires, i had bosch platnum pugs in it. a dealer tech suggested i use a hottor plug, so it now has ac delco rg45's in it now,(been there for 1000miles) i also get what i think is oil on the threads of the plug and carbon on tip of plug after i take them out to look at them. i only have 9k miles on all new 355 engine. and it did this from the start. hmm i followed all preoiling precedures to a T on initial start up, and dont get any blue smoke at all never ... it runs STRONG and gets me 15-18 mpg depending on foot my base timing is at 8* am i in for an after market ignition ie MSD Accel Crane etc.

 

um a little help pweeze

 

I had the same problem with my new 383. I had a stock distributor at the time so. I got an MSD pro billet distributor and now the plugs are clean every time I have checked. Sounds like you may need to look into a better distributor.

 

Click here to view a recent post of mine, sounds to me like the same symptom as my IROC.

Like yours, my car runs great, gets decent mileage and doesn't smoke at all. I haven't yet taken the time to pull the intake

 

Are all th plugs fouling or just one or more?

Well, first you have to determine whats fouling them. Is it oil, gas or coolant. Knowing that will point you in the right direction.

If it's oil it could be a number of things, none good. Ring(s) installed in the wrong groove, wrong size, upside down or gapped much too wide; oil ring spacer ring overlapped instead of butted. Valve guide(s) or valve stem seal(s); leaking intake from the underside of the manifold.

Fuel; leaking or malfunctioning injector, etc.

ECM not taking over timing requiring a replacement computer.

Coolant leaks could be head gasket, intake manifold gasket not sealing.

If there's smoke coming from the tailpipe, the color will tell you what's leaking. A vacuum gauge can tell you if there's a vacuum leak because the needle will jump around.

I'd attach my timing light to each plug wire as near as I could get it to the plug boot and see if a steady spark results.

I'd then run a compression check with all the plugs removed to see if all the cylinders are pumping about the same pressure.

Keep us posted.

Jake

 

well i check #3 and it gets fould ten i check #1 next to it and it is fine the rest r a pain in the *** to check often but i get no smoke at start up and i bout a complete short block fron scoggin ****ey. the car idle does jump from like 700 to 750 and surges to 800 once in a whilecould oil from the valley b leakin in the intake port of the head do i need more spark the plugs began to foul emeediatly how does it get on the threds of the plug??

 

also what would b the best procedure to test the intake for leaks(vacume and oil). i went out and checked 1 3 5 7 and 3 was fould i cleaned the oil of the thread of the plug and reinstalled it. the other 3 looked perfect. by the way i have an oil leak in the back of intake by the dist. but it is no were near the #3 intake port. so i have to replace intake gasket soon anywayz. but i would like t know 4 sure if it is the intake gasket bfor i pull it apart.
thank you for you help merry christmas

 

I didn’t mention this in my previous post, it may be worth checking out. The cause of my car misfiring was not heavy deposits due to oil getting in the cylinder. It will misfire eventually if I don’t clean the plug every few weeks, but it was misfiring all the time. That problem was solved with a set of $3 wire separators from AutoZone.

Don’t think we’ll know for sure whether the intake gasket is the cause of the problem until the intake is pulled.

BTW, how much oil is the engine consuming between changes?

 

I need you to explain exactly what you're seeing when you look at the plug. What I'm trying to determine is what YOU consider as fouled.

A flucuating idle can be caused by a number of different things and may well be a vacuum leak at the intake mainfold. I'll send you a file on how to replace the intake gasket so it won't leak on you in the future.

Jake

 

Jake,

I could use the file, as I will sooner or later have to pull the intake on my IROC. Thanks; email address is in profile.

 

i have pulled the plug right after a fresh oil change . and i have come to the conclusion that it is fouled by gasoline and not oil, the substance i found was very thin and smelled like gas, what would cause this? injector, fuel pressure, would cleaning the injector help? and if so how? my fuel pressure is set at 48psi and i have the stock 350 injectors on it tey have 117k miles on them. the other plugs looked dry and tan in color this #3 looked jet black. i got rid of the surging (Vacume leaK) thanks