Gold Lifetime Member
Join Date: Jan 2007
Location: Braselton, Georgia
High Idle leaky intake gasket
I'm hoping some of you experienced folks can give me some information so hopefully I can fix the problem. There are two issues. I have a 406 in my car, forged internals, Lunati cam, AFR 195 heads, Edelbrock air gap intake, BG 750 carb and MSD distributor.
1. The car idles higher than normal. Around 1000 to 1100 rpm. I used to be able to bump the accelerator and it drop but that doesn't work any longer. It does this no matter what time of year, cold or hot. When it is first started and just getting warm, it idles just as it should, at 750 rpm. This same thing happened when I had Edelbrock heads on the same motor and a different carb. Also, the accelerator linkage is fine, nothing binding nor any obstructions.
2. Number 7 cylinder has an oil leak into the cylinder. Valve stem seals have been changed/etc. Also did a leakdown and that looks good. Ran a videoscope down the intake and can see where oil is coming in where the intake and heads meet. I have changed gaskets a few times and also tried different manufacturers, running Felpro, Mr. Gasket, Edelbrock, etc. And number 7 still leaks. All of the other ones are normal.
Could the oil leak be causing the higher idle issue? Any suggestions on how to get the leak fixed?