Well today I stared at my A/F meter the whole time while I was accelerating and I found the problem. Like I said it's at like .94-.96 at 5psi. Then when it hits around there it goes into freaking closed loop. (numbers on the meter bounce all over the place so I think that is closed loop) then it WAS picking up as normal after a second and hitting like .90 volts but now it's staying in closed loop. Any ideas?

Ok, if I start at like 3K+ RPM's it is fine. When I try to accelerate from below 3K in 3rd, 4th, or 5th it does what I said above. I thought it was the o2 sensor but I changed that and it's still doing it :( any ideas?

What is your max boost set to?

What is our fuel system:

what kind of fpr?
what kind(s) of fuel pumps?
what kind of injectors?
and extra controllers (s-afc)?
what are you doing for the map?

I am running 10 psi. My fuel system is, SFMU, Walbro 255HP, and 30# injectors. I am using the VC-2 for the MAP and I have NO AFC or any other fuel controllers.

have you checked your vc-2 to make sure the right volts are there? Not over 4.7v I think.

NO, I didn't think it would be fuel cut because it'll pull from idle to redline in 1st and pulls fine in 2nd. If it still could be that how do I check?

Multimeter. Hook it up and have someone ride along w/ you. Just run the wires under the hood and inside through the passenger window w/ it down. Then get on it a few times and see if it reads higher than 4.7v if it does then the ECU is probably cutting out. I don’t think this is your problem but I would check it out anyway.

What fuel pressure are you at during full boost and WOT?

Sorry about all the questions I am just trying to break it down to try and find out what is wrong. Kinda hard over the net though. It sounds like fuel though...

Man don't apologize for asking questions. I'm just glad you are trying to help. Anyways my fuel pressure SHOULD be about ~85-90 psi at WOT. I have my static at 40 psi and the 2.72" disk. I said should because my electric FP gauge doesn't work :/ I need to get a couple AN fitting so I can mount my mechanical on the outside for a few days so I can see it.

Well you shouldn't be maxing out your injectors if everything is like you say. I take it you have done plugs, wires, fuel filter.

well if all is good ^^^^ i.e above and if your vc-2 is working right am stumped.

Anyone else want to get into this problem solving???

maybe your getting too much fuel and bogging it down?

Do you have access to a data logger? That would be the best tool for this situation.

I actually just got new 8.5mm wires, colder plugs, new fuel filter, and new o2 sensor. It stumped me also because I thought I had everything ruled out. I don't have a datalogger yet to check. I tried turning my static pressure down from ~40 to 38 psi and leaned out BAD. Hit a brick wall and .77 volts. So I wouldn't think that it'd be getting too much fuel w/ the pressures I have now. It could be a rich spot but I don't really have the equipment to see that :( Thanks for trying.

OK, on the way home I was messin w/ it. Right when it went back to closed loop at WOT I'd let off and immediately floor the throttle again. It went and stayed in open loop. I did this several times and it seemed to work fine while I was doing it. TPS maybe?

Maybe, I don't know how you would check it to see if it is good though.

95 Eclipse RS : 5 speed
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