Spark Plugs Too Hot

mideastmafia · 09-30-2001, 10:47 AM

i pulled the #1 spark plug today and i noticed that there was NO OIL or anything around the hole (good) but the spark plug electrode was white as if it had been burnt.. i think i am running to lean cause the plugs seem to be getting too hot. i am running Bosche +4's.. could that be the reason?

thanks,
SHAUN

Bob's944 · Bob's944's Garage

is it just that one cylinder?

mideastmafia · 09-30-2001, 11:24 AM

i didnt check them all cause i used a socket wrench, not the tool. ill check later on.

SHAUN

Bob's944 · Bob's944's Garage

another question would be are you using an aftermarket DME chip? they advance the timing and might require a different plug from stock. Plugs like that can be caused by over-advanced ignition timing, lean fuel mix, intake manifold leaks, sticking valves or running the engine too hot cause the cooling system is malfunctioning. If it's one cylinder, it could be a sticking valve or a leak in it's intake runner. If it's all the plugs, you have to look at the other possibilities. That's outta the Hayne's book btw.

mideastmafia · 09-30-2001, 04:54 PM

no chips or anything..

BUT at idle the car shakes alot. it used to only do that when it was cold but now that i have added they open air filter it does it all the time.. i know it can be adjusted on the AFM. can anyone tell me how?

SHAUN

mlue · 09-30-2001, 05:08 PM

Shaun,
White electrode could be detonation or glazing. Don't adjust anything until you check all the plugs and get a grip on what actually happening. It could be any thing at this point.

Mark
'86 944NA

[This message has been edited by mlue (edited 09-30-2001).]