What caused it to this?

Bruce · 11-05-2005, 08:55 PM

My car having horrible miss Friday. I am thinking it gotta be the plug are bad because the wires are about 3000mile on it. I pull the plugs today. it all shot and #7 plug, missing the electro tip? and the L shape thing are closed shut. Here the the pics. What caused the plug to do this?? it is Auto lite 104. I now try 103 see what happen next.
It is about 15psi of boost

lcvette · 11-05-2005, 11:40 PM

Bruce,

the pictures are a little bit on the blurry side, but it looks like the #7 plug is covered in oil?

closed plugs = detonation

missing the hook of the plug = extreme heat melted off

looks like you are running lean or you are running too much timing under boost perhaps.. need to figure out whats going on, but I would keep my fingers crossed it is just the plugs that look like that and not you pistons. let us know what ya find.

also have you run a compression test/ leak down test to distinguish you still have good ring seal?

let us know!

Chris

Bruce · 11-05-2005, 11:55 PM

Chris
The car run great after I put in new plugs, this time I try 2 step colder plug.
Only #7 cylinder plug closed and all other have some what light brown color and I think it has some detonations for sure. The plug look dirty because of the ant-seize I am using. I am going to turn down the boost a little until I get my stand alone engine mangement in the up coming Spring and tune it on dyno.

Baldturbofreak · 11-06-2005, 10:54 AM

looks like#7 is eating some oil and knocking, Bruce. That is the same lung that pushed the head gasket out. Id monitor that cyl very carefully.

Bruce · 11-06-2005, 01:28 PM

Quote:

Originally Posted by Baldturbofreak

looks like#7 is eating some oil and knocking, Bruce. That is the same lung that pushed the head gasket out. Id monitor that cyl very carefully.

Rick
When I pull the #7 plug. there is no oil in it. It is not wet with oil. The black mark oil like is from the valve cover where the Delteq, oil is been pushed out under boost. Oil has gotten to the plug end that is why you see the black oil marks.

The last time when we have a pushed head gasket were #6, 8 not #7

Baldturbofreak · 11-06-2005, 08:46 PM

Oh thats right it was the passenger bank, wasn't it. The back cyl get the lions share of the air, perhaps this winter we should add a half liter or so of plenum volume to the maniflold.

Mo_Bandy · 11-06-2005, 11:27 PM

Hi Bruce,

I would probably agree with Icevette...

You might be running too lean...
MO