nm2769

iTrader: (1)

I have been trying to hunt down the source of a vacuum leak. After check just about everything I could think of that may have caused the leak I pulled the manifold and found the throttle body mounting flange warped to the point the o-ring seal is showing. The seal is not pinched and is seated in the groove. Anyone else have this issue? If you have a vacuum leak you may want to check this area.

ULTIMATEORANGESS

iTrader: (4)

my 92 warped with catastrophic results.

98TransAmWs-6

iTrader: (11)

I would contact FAST about that issue, hopefully they can resolve the issue. My 102 does not have that problem.

thunderstruck507

iTrader: (18)

Did you confirm it was leaking there?

I just did a smoke test on mine the other day and had no leaks anywhere except the throttle blade shaft which is normal

I had the rockers off so the valves were closed and I used a Slime brand tire pump that has ports for inflating and deflating a raft. So I hooked up the deflate to some clear tubing and slipped on onto a hookah hose then hooked the inflate side to a vacuum line. This pumps smoke into the engine at 6psi.

nm2769

iTrader: (1)

Yes I am dealing with Fast now to get it resolved.

nm2769

iTrader: (1)

Yes spraying a little contact cleaner around the seam is what led me to pulling the manifold. A thin feeler gauge will slide right by the seal.

thunderstruck507

iTrader: (18)

Hope they work with you to resolve that then because that is no good.

nm2769

iTrader: (1)

Received a new manifold earlier this week from FAST. Bolted the throttle body on and no gap. Customer service was good no complaints.

ULTIMATEORANGESS

iTrader: (4)

good deal.

BlackDuk98

iTrader: (34)

I have the older 90 that the front flange warped and the whole bottom warped as well. Mine doesn't have the nice brass inserts on the flange. I was planning to make a rubber gasket that would eliminate the need for the o-ring but haven't done so yet. I solved the problem by adding rtv to the o-ring which solved my problem. The bottom on the other hand is pretty bad, only idea I have is the heat caused this. I would like to grab a new one if I see a good deal some day and sell mine for cheap to whomever wants to save money and wok with it.

deviousreaper

I have a fast 92 that's warped from the bottom is there any performance loss with this ?

ULTIMATEORANGESS

iTrader: (4)

i wouldnt mess around with it if it was me.

poltergeist 02

iTrader: (65)

My 92 was like this out of he box new. No vac leak though. I thought about making an aluminum bracket to bolt from the back of that flange to keep it straight.