1994 Infiniti Q45 Hard Starting

The vacuum hose for the fuel pressure regulator should be dry. If gas is present, it means a bad pressure regulator.

Do a vacuum test to determine if pressure regulator is holding vacuum. If it fails to hold vacuum, the engine would be running too rich at idle causing stalling.

Ok, I did the Test and It did not hold pressure. It slowly went down. I removed a vacuum line from the back side, under the regulator. It is a :Y: shape, and it was full of gas, as was the line from the bottom of the regulator. I was not able to break loose the screws on the regulator. Not much room there. Is there a special tool for that? Am I even going in the right direction? I have to do this myself, because all the men won't give me a fair deal. They treat me like an idiot. Thank you, You are wonderful.

Yes you are on the right track and sorry that you had bad experiences with men, lol.

No, there are no special tools and you have to be careful not to damage the bolts head if they are too tight. You need a good grip and righht amount of force to get them loose.

Good luck.

Will I need to remove the intake manifold and fuel rail to change the fuel regulator? It looks like a big job but there is not much room for a screw driver.
Thank you, sandee won

I can't remember the exact procedure as it was a long time ago that I last did this but you would need to remove whatever that is restricting access.

Thanks! I replaced the fuel pressure regulator. I did have to remove the intake manifold and fuel rail to get at it. I carefully connected all fuel and vacuum hoses. I must have missed something. It will start up on first turn, but idles way down and dies. I hold the trottle up and keeep it running. If I rev it, a back-fire in the manifold. No power brake vacuum and black smoke too. What clould I have done wrong? Please tell me the truth, I can take it.

Seems something was not installed correctly resulting in vacuum losses. Ensure manifolds are flush and was the manifold gasket replaced or was it cleaned?
Check the brake booster hose for leakages and proper installation.

Btw if the battery was disconnected. it results in computer memory losses and this would cause excessively low idling. When throttle body and IAC valves are dirty, air flow is restricted and the engine computer needs to relearn before the idling stabilizes. One quick way is to have the throttle body and IAC cleaned.

Excessively low idling can reduce efficiency of the brake booster if it is repeatedly used within a short time frame.