Before I start let me say that last night I tried a spare FPR I had laying around. When I first starting driving it I had 0 KR and my fueling was in the 920s. Aboubt 2 miles down the road with the same test, the problem came back again. Dipping into the mid/low 800s and an assload of KR. I donno what the likely hood of 2 bad FPRs are, but i'm thinking slim to none since I don't common here the going bad on here or ClubGP. Hell, I don't even know how they die to begin with. Read on...
Here are my findings this morning...
Key On Engine Off: 44psi
Key Off Engine Off: 39psi (5 minutes) and I think still dropping
Running in Park at Idle: 45psi
Running in Park at Idle w/ Vac Line off FPR: 54 psi
I noticed my numbers are a bit off of yours. I assume thats what the specs call out? I could of sworn years ago on my White GTP I got the same numbers as i'm getting off the black car. I'd go compare it now but I have PRJs with no Schrader Port. I really need to buy a FP gauge for my fuel rails, its been on my to do list forever. I wish a BOLT IN schrader was availible for a 1/8 NPT hole.
Anyway, let me know what you think. Read on below too, I check out a few other things too....
BTW, this is the Black GTP, not my White one. The Black one has literally not been touched mod wise in years. No alky on it.
I check my LTFT and it was at +1 locked. Not 0, but close. IIRC, wasn't the acceptable range between +3 through -3?
The way this problem is acting, its running out of fuel. I really don't think tuning is the issue sense it ran fine 4 other seasons. The O2s seem to dip lower and lower the faster I go, KR builds too. Like its running out of fuel.
BTW, I checked my Inj. Pulse Width and they were at 19-21 which is about maxing out injectors. Like I said, before this issue popped up it was KR free and fine. I could easily see the PW up higher if the Fuel pump wasn't keeping up with it. Thats my only theory and i'm probably wrong too. I'm still on stock GTP injectors and they should be plenty for what little the car has done to it.
And with that said, has ANYONE had a pump gradually go out, show signs of weakness? I for one can say I have not, at least not on a electric FP. Anyone?
Well, it is a Overkill PCM...isn't there something for a generic temp. setting or a factory temp. setting in the PCM? Just wondering as I don't know tuner systems very well...
I have no idea, all I know its a pretty spot on tune. Better than I could ever do it.
I answered you above I think. Heres a question for you... Could the LTFT be effected by a weak fuel pump OR something not right in the fuel system? Keep in mind, i've reset my computer a couple times trying to cure this. I think it has maybe 50 miles on it now.
How can I get my LTFT to 0? I'm no tuning guy, so I really have no clue. Thats right, I have a DHP powertuner and I have no idea how to use it. I'm kinda skeptical this is the issue. I hope i'm wrong, but things never seem to go easy for me.