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#1 |
Registered Member
Join Date: Dec 1998
Location: tustin,ca,usa
Posts: 21
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![]() My 90gt was running great, then a month ago it dies in traffic. At home I can sometimes get it started but I have to rev it to 3000
to keep it going, as soon as I take my foot of the gas it abruptly dies. When I turn the key to the on position it will prime the fuel pump then a few seconds later it primes it again and again and again.But my fuel pressure is holding at 40 psi. What would cause it to continually prime the pump without turning the key off and back on again? ...So far these are the parts I've changed Coil stator in distributor ignition module wires plugs computer eec relay fuel pump relay ignition switch fuel pressure regulator fuel filter The only code I get is a 15 I don't know where to go from here any ideas.....lmk |
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#2 |
Import Slayer
Join Date: May 1999
Posts: 2,241
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![]() Try changing the engine...LOL Seriously, maybe it's the TPS
Did you try and reset the computer?
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'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator. |
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#3 |
Registered Member
Join Date: Oct 1999
Location: Pierre Part, La. U.S.A.
Posts: 1,850
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![]() SHIP ANCHOR........ Thats the Mustang spirit buddy.
Try the tps. And check if you have water in the oil.
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88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid ![]() |
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#4 |
Registered Member
Join Date: Mar 2003
Location: Saint Louis, MO
Posts: 634
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![]() Probably the TFI - a guy on another board just went throught the same thing - he even had the TFI checked and was told it was OK, but as soon as he put a new one on his problem stopped. The TFI often fails when warm but is OK cold, hence the good test at a store.
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Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/ |
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#5 |
Registered Member
Join Date: Aug 2002
Location: SanAntonio, Tx
Posts: 957
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![]() If your fuel pump keeps running, you need to check it's wiring, also, does your fuel pressure hold with the engine off, key on or off?
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear |
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#6 | ||
Moderator
Join Date: Sep 1998
Location: Grand Rapids, Michigan, USA
Posts: 1,001
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![]() Quote:
This problem has puzzled me, because you've already replaced most of the parts that commonly go bad or come to mind. There is NO WAY a faulty TPS is going to cause your fuel pump to turn on and off, btw. The EEC-IV is in control of its operation via a relay and the power supplied to each; it doesn't care whether the TPS is out of range as far as fuel pump control is concerned, which should be your main priority right now. By your wording, you say you can turn the key to the 'on' position, and the fuel pump will continuously prime, correct? There HAS TO BE a power interruption of some kind for this to happen (without the engine running and then stalling). You've already hit the fuel pump and EEC relays, so that takes them out of the equation. I believe you have a wiring or related problem; somehow the 'chain' is being broken here. It could very well be as simple as a loose/corroded connector on one of those relays. I've fixed several 'problem cars' looking for this type of thing. Check all of your grounds as well as fusible links and power feed wires. FWIW, your code 15 means (according to this one guy's site, anyway): Quote:
![]() Good luck. ![]()
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Capri306, Moderator The Mustang Works Online 1979 Mercury Capri 1987 5.0L Mustang LX Notchback 1993 5.8L Eddie Bauer Bronco ![]() |
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#7 |
Import Slayer
Join Date: May 1999
Posts: 2,241
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![]() Good point.....since Ford ignition switches are prone to go bad.
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'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator. |
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#8 |
Registered Member
Join Date: Mar 2003
Location: Saint Louis, MO
Posts: 634
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![]() KAM is fed from a 20guage fusable link that also feeds the EEC relay (power side - fuel injectors, MAF, IAB, Thermactor, EGR).
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Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/ Last edited by tmoss; 11-27-2004 at 06:34 PM.. |
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#9 |
Registered Member
Join Date: Nov 1998
Location: southern Illinois
Posts: 312
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![]() wasnt there a tsb on the ignition switch? might see if you cant get a dealer to do a recall on it.
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88 gt convertable =-= cobra intake, accufab 65 mm tb headers alum underdrives steeda alum.lca's, springs, c/c plates kyb struts 230 hp to da wheels http://www.cybersteed.freeservers.com |
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