does anyone have a fuel pressure gauge? If so were did you splice it into and what is the psi at idle.

 

I never had one, but my question to you is are you having problems with your fuel pressure?

In all my experience, I have NEVER seen or worked with any 4G9x, or any mitsu for that matter, with fuel pressure problems. What is going on in your setup?

 

i have a miss at idle that will come and go but it is a daily thing. If i rec it up it might smooth out for awhile or it might smooth out on it's own but it will always return in a few min. And the car will hesitate will keeping a constant speed. MY a/f gauge will go from lean to rich like normal and then it will go full lean for a sec then it will hesitate. And i hooked up a gauge in place of the fmu just to check psi at idle and the psi was 16psi. And mits said at idle it should be 38. But i don't know if the gauge is acc. Because it's just a 100psi gauge from a hardware store. But if i was that low i would think my car would be running alot worse,or im checking in the wrong spot. Also when it start to misfire i lose alittle vac on the boost gauge. Also when i turn on the headlights i loose vac also. Plugs,wires,coils,comp 195 across board,maf has all been changed.

 

Have you adjusted your timing at all? What piggyback are you using to control all that? I never was fond of those FMU units since fuel pressure is all dependent upon boost pressure. I much prefer a nice 1:1 and work from there.

Anyways on to the misfire... several quyestions for ya. Any vacuum leaks (what is your vacuum at idle btw), is it throwing a CEL, injectors still good (i.e. clean), no bad emissions crap (EGR good etc) ????

Back to your original topic, i was for some strange reason thinking about a guage checking the fuel pressure in the lines from the tank, not thinking that you were asking about a simple gauge to monitor in the engine bay.... yes I did have a fuel pressure gauge but I had an Aeromotive FPR and it was very easy. It was a B&M gauge and it screwed right into one of the ports of the Aeromotive FPR. If that is what you are talking about, I believe in the 4G93 it was 38 psi at idle.