Hitting fuel cut when I get on it hard, just during spike. After it levels off I dont hit fuel cut anymore. I double checked every visible vac line & they are all good. What else could it be?

I was making 5 psi, I fixed the inlet hose that was leaking, now I am making too much. I cant win....

 

Make sure the hoses are correct on the Boost control Valve.

 

I had a feeling that might be it, I will check this afternoon.

Another possibility is the vac hose fron the turbo outlet. The spring loaded clamp is on the hose about 3-4 inches up from the nipple it attaches to on the turbo itself. I had slid it up too far & it was dark & like 15 degrees when I waqs replacing it, so I just used a zip tie. Is it possible that line might be crimped & sending incorrect pressure info to the solenoid? Or no? I dont think it could be that crimped, but if its possible I will check it.

 

Hoses are in correct order & every visible hose is brand new..... Plus occasionally evrything is fine after driving a while, but sometimes it will be like that all day...

What could this be? Its annoying..

 

Maybe a bad Boost control Valve.

 

Figured it was a bad BCS, so I put in a MBC. Even on the lowest setting its still too much boost. I am thinking it might be the wastegate actuator rod. It may have been adjusted by previous owner. The car did have a slight boost leak and he may have done that to compensate. I have heard of that as a 'mod' but dont know much about it. The excess boost has occurred since I fixed the boost leak.

So now I am attempting that. Is the whole rod supposed to turn? Or just the piece on the threaded end? My whole thing is turning. I have some WD40 soaking in it now so I can just turn the end. But is it bad the whole thing turns?

 

Just adjusted it. I made it a bit longer and have it so it pretty much lines up with the rod for the wastegate with just a slight pull. It required a little pull before I adjusted. I would say the rod covered half the hole. Much better now. Only did an around the blocks run, but it seems good. Definitely a little less boost. I may adjust a tiny bit more, boosting low, then use the MBC to bring back up & improve spool. Plus the MBC is easier to adjust down the line than the wastegate rod.
But so far so good. Will post later after highway run.

 

Glad you got it figured out.

 

the wastegate adjustment is the most common way of getting free boost upgrades.....ive used all methods and this seems the safest so far ..not having vaccum restrictions..ya know