North American Turbocoupe Organization



Too many problems
Stephy Offline
Junior Member
#1
Okay here's the deal...my 88 turbo coupe has way to many problems to describe here but here's the jist of it. My car has a miss in it. I've done all the obvious things. Spark plugs, wires, cap, rotor, ect. Found out that the vacuum sytem in the car is all messed up. I'm going to fix that. Replaced the MAP sensor, O2 sensor, TPS, temperature sending unit. I still have to miss and I'm burning gas like you wouldn't believe. The fuel mixture in it is really rich. Anyway I can fix my fuel problem and the miss in my engine? I'm running out of ideas.
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tylerport Offline
Senior Member
#2
As for the running rich problem, pull the vaccuum line off of the Fuel Pressure Regulator (FPR) and see if there is gas in there or even the smell of gas. If so, the diaphram in the FPR may be ruptured. Even if it's not ruptured, it may be letting too much fuel pressure through. You'd have to check your fuel pressure to know. You could just replace the FPR and see if that helps.

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Jim Portteus
NATO Member
86 Turbo Coupe, 131K Miles, 140MPH Speedo, Gillis Valve, 2 1/2" Downpipe to 2" Duals w/ 18" Glasspacks, 245/50R16's and new paint.
Jim Portteus
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Dan E Offline
Posting Freak
#3
Agreed. Sounds like the FPR.

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Dan Eaves
88TC 5spd, Crower 5.5" Sportsman Rods, Short Wiseco Pistons bored .030" Over, Ported Head with Polished Combustion Chambers, Gutted & Polished Upper, Ported & Polished Lower, Polished T/B, Ported E6, SVO T3 .63AR Turbo, Bosch Bypass Valve, 3" DP w/No Cat, 2 1/2" DynoMax single cat back w/DynoMax Super Turbo Muffler, RR Cam, K&N in Fenderwell, Gillis Boost Valve, Centerforce I Clutch, Removed A/C, Polished Wheels, Polished Valve Cover, Polished Crank and W/P Pulleys, Walbro 255LPH HP Pump, Kirban Adj FPR, and the DAMN Heater Core is new too !

NATO MEMBER (Vice Chairman...if it's a vice...I deal with it)
Dan Eaves
88TC 5spd Vermillion Red, Polished...everything...
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Jr88TC Offline
Member
#4
Wow, i guess thats the problem i got, because i get 13 mpg no matter how i drive! Good thing i bought a kirban to install!
Jr.
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Jonesy Offline
Senior Member
#5
Wonder why noone recommended for me to check my FPR, hmm, besides timing being off, I may have the same problem, so wheres the best place to get a new FPR?

Jonesy
Michael "Jonesy" Jones
87 Medium Red Clearcoat Metallic 5 speed
2 Tone Leather Interior, All options including factory sunroof/moonroof
168,500 miles - So Far
Mainly stock, K&N Filter, custom ram air
New paint job COMING SOON(repainting factory med. red with ghost flames.)
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Jr88TC Offline
Member
#6
www.holcombmotorsports.com
well thats where i got mine, same FPR for a mustang5.0 93 and earlier. Like 80 bucks, and it's a nice piece.
Jr.
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segfaultxr7 Offline
Posting Freak
#7
If you buy an FPR for a 5-liter, there's no guarantee that it is set up to increase the pressure under boost. Make sure that what you buy is either for the 2.3t specifically, or that it says it is "boost compensated" in the description.
88 TC 5-speed
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Jeff K Offline
Administrator
#8
Quote:Originally posted by segfaultxr7:
If you buy an FPR for a 5-liter, there's no guarantee that it is set up to increase the pressure under boost. Make sure that what you buy is either for the 2.3t specifically, or that it says it is "boost compensated" in the description.

First of all, 5.0 and 2.3T regulators are 100% identical. By virtue of how they work (Spring preloaded diaphram), they are all "boost referenced" in a 1:1 ratio. I ran an old 5.0 regulator on my TC for 6 months with no problems, and now I run a Kirban 5.0 AFPR on the TC.

Stephy.... Our cars are mass air flow fuel management, and dont use a true MAP sensor. Our cars use a BP (barometric pressure) sensor, which is virtually identical to MAP sensor, except it is referenced to ambient air pressure, not manifold pressure. Be sure there is NOT a vacuum line hooked to the port on the BP sensor.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 00 Windstar (wifes vehicle)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Stephy Offline
Junior Member
#9
Hey guys, thanks for the suggestion on the FPR. I went and put a new one on today and it runs a lot better. Before it wouldn't rev up past 3000rpms but now it goes as high as I want it to. I'm still leaving a cloud of black smoke and it still misses. I'm going to do some messing around with it tommorrow and pull some codes off and take it from there. And probably put a new fuel filter on. But if anyone has anymore suggestions for the miss in it, it would be greatly appreciated!
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andy90sc Offline
Junior Member
#10
hmmmm....i doubt the fuel filter is a problem if its running rich like that...you may want to reset the ecu (disconnect the battery for about 10 minutes) just to see...you're VAM may also be opening when its not supposed to...fuel injectors could be going bad or bad already...timing is a MAJOR factor also!!!
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