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Old 03-16-2012, 09:06 PM   #1
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Ok, Im in really bad need for some of yalls expertise. Last week I received my Sct tuner. I loaded the 91 Perfomance tune with ease and felt the instant gans. After awile of driving I was cruising in 5th gear and WOT'd it to pass someone. It started shrugging and lost immediate power so I backed off and let off th clutch. So cruising in 5th its fine but at WOT it feels like its gonna die. Well it threw a SES..so I checked it and it said Fuel Rail Pressure-A. I serch on here and the web and all P0190 were FRP sensors. So I started with the smllest of things fuel wise and had the filter changed. Didn't fix the problem, then I ordered the sensor and replaced that today with help froma member on here. Cleared the code, went on a little cruise for the past 2 hours. Now its doing it in all gears and over 3k rpms. I stopped, reloaded stock tune and problem still there. Reloaded 91p tune agin problem still there. Can anyone shed some light on this? On thing left to do that I know of is the fuel pump. I am reading up on the data logging and how to do it. This is so frustrating, I'm getter a fuel pressure guage tomorow to check that and really don't know what it is suppose to be at to begin with. If anyone has had this problem and resolved it or knows what my exact problem is please let me know. Hell ill even paypal you a litte tip for the one who helps me fix this issue.
I was told also that it could be tuned related. But even going back to stock the prob is still happening. I noticed also it happens less when she's clold vs hot.
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Old 03-16-2012, 10:49 PM   #2
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I had this problem and it was my fuel pump going bad. Fuel pressure should be 38-40 psi at idle and mine is over 50 at wot
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Old 03-17-2012, 03:55 AM   #3
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I would bet it is the fuel pump. Ive heard alot about them failing due the increased load from the tune. Now I may be completely wrong about this but just passing on what I've heard. Good luck!
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Old 03-17-2012, 04:04 PM   #4
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Called Bama...they said to check all the fuses and possibly could be Fuel pump. Fuses all good...i bought a FP guage...idle is 32psi....WOT it drops 10 psi then goes up to 45-50..would that be a bad or going bad pump?
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Eibach pro kit,Tokico shocks/struts,BBK CAI,75mm TB/ Plenum,4.10 FRPP gears,BBK o/r X pipe,Magnaflow Catback,SCT Tuner running 91 Tune,Bama Tunes for Life Member,RAM HD Clutch,BM shifter with MGW "GT" knob,AM smoked Headlights/Sylvania zXe bulbs,VHT smoked tails/3rd brake,Redtop Optima,Mach 1 grille delete,Mach 1 chin spoiler,BULLITT Pedals,20% tint all round,4.6 High Performance Badges
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Old 03-17-2012, 04:16 PM   #5
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Sounds like its the pump. On mine and my 2 friends cars fuel pressure at idle was 38-42 psi. And if it's dropping with increased load then my first suspect would be fuel filter and if that's clear change the fuel pump.
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Old 03-18-2012, 07:37 AM   #6
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Quote:
Originally Posted by MiGT01
Called Bama...they said to check all the fuses and possibly could be Fuel pump. Fuses all good...i bought a FP guage...idle is 32psi....WOT it drops 10 psi then goes up to 45-50..would that be a bad or going bad pump?
Definitely sounds like the pump
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