99corvette

iTrader: (12)

They are built into the MAF

okieraptor

Ah ok. My reads right when warm but I've never checked it when it was cold.

1FastBrick

iTrader: (17)

Does this have a fuel pressure regulator on the driver side fuel rail???

99corvette

iTrader: (12)

Yeah, I pulled the vacuum line off and let it run for about 5 mins and no fuel ever came out.

99corvette

iTrader: (12)

I unplugged the coolant temp sensor and treys to crank it when cold and it had no effect.

Suburbazine

Unplugged will cause the fueling tables to go bonkers on a cold start.

1FastBrick

iTrader: (17)

Need to put a fuel gage on the rail and test it. Pull the vacuum line and it should jump up 8-10 psi.

If it does not, it might not be working correctly.

Have you cleaned the throttle body and idle air control valve?

99corvette

iTrader: (12)

It wouldn't even crank just like with it plugged up.

99corvette

iTrader: (12)

Test it how? I already put a gauge on it and it read 48psi with just key on and pump primed not cranked and goes to 50psi running.

I did clean the TB but where is the IACV?

Suburbazine

Engine running, gauge hooked up, pull the vacuum hose off the regulator. You should see a pressure spike.

If you have a DBW throttle body, you have no IACV. If you have a DBC, it's the small gold round thing on the upper right side. The holes in front of the blade are where the IACV draws from.