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Fuel Pressure?

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92 AWD ECLIPSE

15+ Year Contributor
109
1
Feb 2, 2004
Knoxville, Tennessee
I have been trying to diagnose this problem for a while, and there is a reason I am posting in tuning as opposed to problem diagnosis. My mods are in my mod list, but I just recently built my engine, and have not been able to fully boost since I finished it. At first I had a huge boost leak, and now I think I need a new fuel pressure regulator.
I have the 255fp rewired, 550cc inj, and just switched back to the stock fpr. I was using a pos b&m. Here is the deal, I have my boost set at 10psi, and I cant even give it more than 50% throttle without the engine bogging. I have also tried it at 20 psi, and there is no change. When the bogging occurs, my a/f gauge just flies to rich and stays there, so i am pretty sure that i am running way to rich.
I have been reading every thread possible on a good fpr, and was wondering if you think this would be my prob. The ones that I am looking at are, Aeromotive, Buschur SX, and fullthrottle.
 
If I'm following this, you have a rewired 255 and a stock FPR and stock return line. In that case, what kind of pressure are you seeing at idle? Probably quite a bit over the target. This can be dealt with via the LTFTs, but those don't apply at WOT, right? So, at WOT, you're going oink-oink rich and bogging.

Note: if 1Gs apply a LTFT at WOT (unlike 2Gs), then disregard.

- Jtoby
 
My idle pressure is about 40psi, and yes the car drives fine as long as im not in boost. At wide open throttle I dont have any response at all, as soon as the turbo spools, I bog completely. I will hook my logger back up and try to see what my LTFTs are. I also unhooked the line going from the IM to the pressure sensor on the firewall, and hooked it straight up to the fpr, and that seemed to work a little better. My afc settings are, hi th 0%, lo th 5%. No matter how lean i make it on hi th it will either bog from still being to rich, or just not go anywhere from being to lean. I have been across the spectrum with the afc, and that is why I am suspecting that my prob is a fpr.
 
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