North American Turbocoupe Organization



88 TC- starting and running issues-FIXED
Blue88TC Offline
Member
#1
i just picked up a 88 turbo coupe today, all stock 5 speed. started fine when coming here...stumbled some under a load, figured the gas in it was bad since its been sitting for a while, throw some fresh gas in and went on my way and it seemed a little better. got home and parked it and when i went to start it back up it just cranks and cranks and cranks, when i turn the key you can hear the fuel pump prime. it seems like plenty of spark but not enough fuel...

havnt gotten my hands on a correct fuel pressure tester yet to check FP but i did put on a new fuel filter...i did mess with the car again today, took me about 10-15 mins to get it to start and stay running...but i got it running and it ran for about 15 mins and once it got warmed up it just died like it did last time...the check engine light was on so after the car died i pulled the codes and got...

41...65...72...

41-lean
65-vaf input low
72-power interupt

now it also didnt want to rev that good, if i floored it, it was spit and stumble around 2500 rpms and bounce around, if i gave it half throttle it would bounce around 2000-3500 rpms, but it would not go any higher... any more ideas?
1988 turbo coupe, ported head, big valves, RW #1 cam, adj cam gear, front mount, ported intake, gillis, k&n cone, exhaust
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Pete D Offline
Administrator
#2
Nest cold start, turn key to run for a couple seconds, turn off and then back to run, quickly, for another couple seconds. Do this for 3-4 cycles and then try to start it. If it starts easier (quicker) you probably got a fuel issue. Get the gauge and do the diagnostics.

Code 65 is that it never went into closed loop

More info here
http://www.tbirdheritage.com/turbocoupe/...stepid=H30

Code 72:
http://www.tbirdheritage.com/turbocoupe/...stepid=QE1
Pete Dunham


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Blue88TC Offline
Member
#3
now have codes 14,41,51,54,65,72...tryed to test fuel pressure but gauge was leaking just a little...never got it to go past 8psi off and 10psi running
1988 turbo coupe, ported head, big valves, RW #1 cam, adj cam gear, front mount, ported intake, gillis, k&n cone, exhaust
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Jeff K Offline
Administrator
#4
Unless the fuel leak at the gauge was massive, it wont effect the measured pressure much assuming there is enough pumping volume. Usualy, a Ford wont even start if press is under 20 psi or so. I am guessing either very weak pump, plugged filter, plugged sock in tank, pinched supply line, or bad FPR.
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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Blue88TC Offline
Member
#5
interesting...i was told if there is any leak at all at the gauge then the reading is absolutely no good....im not sure which to believe...both makes sense...whats weird is that it will run fine for a while and then just shut off and not start back up...doesnt make sense
1988 turbo coupe, ported head, big valves, RW #1 cam, adj cam gear, front mount, ported intake, gillis, k&n cone, exhaust
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Pete D Offline
Administrator
#6
A "good" pump can pump more volume that is needed at idle/low speed to maintain needed flow and pressure. A minor leak won't make "that much" difference in that situation

A weak pump can't keep up with pressure or volume and a minor leak makes a big difference then.

If you didn't get past 8 to 10 psi with a small leak, you have problems, like Jeff pointed out.
Pete Dunham


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Blue88TC Offline
Member
#7
gotcha...so i put a new fuel filter on it and nothing...so i was gonna try to dissconnect the return fuel line and see how the flow is to see if i can rule out FPR or not (i dont see or smell any gas at the line)
1988 turbo coupe, ported head, big valves, RW #1 cam, adj cam gear, front mount, ported intake, gillis, k&n cone, exhaust
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Pete D Offline
Administrator
#8
Quote:so i was gonna try to dissconnect the return fuel line and see how the flow is to see if i can rule out FPR or not
Low pressure is not due to a blocked return line. It is a supply side problem. It might be something other than the pump, but it's on the supply side.
Pete Dunham


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Blue88TC Offline
Member
#9
the reason i was going to check the return is because in the write up it said while doing the test if fuel is returning then check FPR.


posted 03-27-2010 12:45 PM
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if you have the key on and the fuel pump test going (fuel pump running all the time) and you take a tool and push the shrader valve in, how high should or would you think the fuel would shoot out? i held the valve down and fuel is coming out decent but its not even hitting the bottom of the upper intake manifold...

also could you test the FP with the stem in the schrader valve out. or would that give you an incorrect reading...

the harbour frieght FP gauge (not leaking now) so its 4psi off and 6psi running...would the car even run at 6psi of FP or do you think its the gauge or something?
1988 turbo coupe, ported head, big valves, RW #1 cam, adj cam gear, front mount, ported intake, gillis, k&n cone, exhaust
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Blue88TC Offline
Member
#10
3 words..."Split Hose Fix"
1988 turbo coupe, ported head, big valves, RW #1 cam, adj cam gear, front mount, ported intake, gillis, k&n cone, exhaust
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