3406b missing allen screws from pump??

Could be, its def something like that. How is the lag on the turbo? And is the lag the same no matter what?

 

Yeah, 24psi is normal, 14 is def low. Either fuel or air issue, only two it could be. See how afrc valve works out then go from there.

 

Without getting my hands on it to check the advance and really dig into the pump it is hard to say.

There aren't a lot of things that come and go like that, usually if it were a seal in the advance it would change when the oil got warm and not change until it cooled back down.

I am a firm believer in a fuel pressure gauge and even a restriction gauge on the supply line before the transfer pump.

 

That's what keeps throwing me, there's only a few things that would act up and then go away.

 

I would think if it was a restriction in fuel line it would make its manifold pressure then splutter out till you let off. Even if it was something covering the fuel pickup tube in tank. As stated without seeing touching feeling it's hard to say. Also as stated in a firm believer in fuel pressure and restriction and pyro for sure.

 

Yes, usually a fuel restriction will cause the back two cylinders in the pump to starve causing a slight miss on 5 and 6.

 

Just a thought I would be curious if the missing screw is outside or still in the governor housing. Be surprised how a little thing like that can get places that seem impossible when gravity is supposed to pull everything down