92 Tracker Won't start

[Kirkd]

Help! Just got this it had sat for about 2 years and ran fine for about 100 miles. It is a 92 8v Fuel Injected 5 Speed. 128,000 miles. Just died and won't start. Has spark, Full tank of fuel and apears to be pumping fuel. I disconected the return fuel line and have gas flow. If I squirt fuel in the intake it fires and dies as soon as that charge of fuel is gone.

I can work on it but not sure where to start? Help!

Thank you

Kirk

[jtgh]

great job , checking spark and test fuel !!!
few here take the 2nd step.

fuel flowing out ,the FP reg , means only that the pump is trying to pump.
the FP reg. must work and regulate the line into the Injector, to 30psi.

Your fuel filter left banjo fitting has a test port, (under pressure , it will shoot out)
and you can test it there. 10mm head, 6mm thread. (most gauge sets have this link)

if pressure is low , rap the FPreg and it might unstick ( stuck wide open)
regs can fail 2 ways, stick high or low.


#2 would be bad ECU, replace C111.

Fuel-pump-testing
My ECU is bad now what?

to put this to bed.
NOID lamp on injector lead, good, then expect fuel pressure.
bad, ECU cap is open. C111
if NOID lamp passes.
Take a real pressure reading.

after 2 years , fuel can be bad, and the Fuel filter will be bad.
bad filters kill pumps.
then the 10 micron screens in the TB injector clog.

keep us posted.

cheers. !

[Kirkd]

JTGH,

Passed NOID
Installed new fuel filter

No fuel in injector throat and still won't start.
Will have to wait unitl tomorrow to do pressure test as I don't have a guage that reads that high.

P.S. Where is the fuel pressure regulator located?

[jtgh]

you are fast !

http://carfix.stufftoread.com/TBI-1w.jpg

FR reg, front of throttle body

put guage here:

http://carfix.stufftoread.com/INJECTORS/TBI-conn-1w.jpg


cheers.

2 years sitting , might have low compression,?
but if it runs with instant start, it must start.



http://carfix.stufftoread.com/fresh-...inj-view1w.jpg

screens?

[jtgh]

to pop injector,
take off top clamp.
take off rear , fuel feed.
towel lay on top injector.
apply air to rear fuel port, pop, duck !

[Kirkd]

Originally Posted by jtgh

you are fast !

http://carfix.stufftoread.com/TBI-1w.jpg

FR reg, front of throttle body

put guage here:

http://carfix.stufftoread.com/INJECTORS/TBI-conn-1w.jpg


cheers.

2 years sitting , might have low compression,?
but if it runs with instant start, it must start.



http://carfix.stufftoread.com/fresh-...inj-view1w.jpg

screens?

Fuel Pump test

Key on 30 LBS
Then click sound from a relay? under hood and pressure starts to drop.

Turn engine over as in an attempt to start it and Pressure goes back to 30 LB then begins it's leak down. Appears to leak down to about 10 LB in about 1 minute and then hold for a few more before a further decent.

Keep in mind this test is with a Cheep Harbor Freight gauge set.

Is it the regulator?

P.S. Just did a compression check and got 150 on 1 to 3 and 90 on #4 so 4 has an issue but does not seem that it would keep it from running. Unlees it was an Intake valve which could affect manifold vacume?

Timming is between 7 and 8 degrees from what I can tell at cranking.


Thank you

Kirk

[jtgh]

ok weak #4, it might come back after rust works off valves.

timing ok. for now.

key one , FP only runs 3 seconds , that is hard coded in ECU ROM.
so as long as you get 24 to 30 cranking ( PUMP on Full time cranking always)
it must start.

you are correct that push air in the intake would be bad. but it doesnt seem much.


compression. ok (marginal on one, 150 ok cold, 170++ hot)
timing. ok.
spark.ok
Injection pulses. from ECU,ok.
30PSI cranking , ok

got to be injector not squirting. (clogged up screens)
look down bore of TBI , you can watch it squirt all day long,
just wear a flame proof suit. LOL ( mirror is best)

30PSI + Noid Pulse = it must inject.
costs $18 at witchhunter.com to clean mine.

[Kirkd]

JTGH,

Got the injector back from Witchhunter.com and they said no problem found. Had a little better number on there "after test" than before but it still won't start. I re-ran the fuel pressure test and the NOID test. I am using the RS LED for a test light. What I am seeing is at cranking a dim glow out of it more than a pulse at cranking when you first hit the starter it flashes but as cranking goes up it goes to more of a glow. Is this normal? I even tried pinching the fuel return line and did not help. There resistance test showed 1.2 mine on my fluke shows 1.7 but still should be within range. Ideas? Just to see I gave it a shot of starting fluid and it took right off and then died. Grrrrrrrr!!! Help!!!

[jtgh]

that injector 30 psi drop is the 3 second rule for Fuel pump relay.
you only get 3 seconds for fuel pressure ,each key on.
20lb drop in 1min.max is spec. or less.(key on ,to key off)
and 100% while cranking and 100% on while running.
the pump is ok and so is your FI.
the noid test is bad.
trust it , it just be out and pulse brightly for each injection.

There are 2 transistors and 2 wires from the ECU and injector. it is a very simple circuit.
2 wires, and 3 parts that can fail.
injector is good,
so its 2 transistors are 2 wires.

but make sure the cap, in the corner is fresh and new.
see last frame photo below. that is what is failing.

transistors

id replace C111 as shown here.

My ECU is bad, now what?

[jtgh]

if this cap is bad ,car will be crazy , run one min. fail the next and be horrible to live with.
always replace it if it is suspected.
if you suspect it is old, if you suspect it is orig. (looks black , has Rubycon on the side) or
it is deformed or leaking or you just want to have it run another 100k , replace it.

then after that is done and injections are failing.

keep in mind the wiper tap pin on the TPS must not be near 5.0. or there will never be injections (unflood mode that is)
my spec on that is over 70% of 5v. or 3.5v ( but it should be closer to 1v at idle)
that is a GOTCHA.

next is to test or just replace those 2 transistors.
but finding them can be a problem. (MCM electronics , stopped carrying them, sorry to say) (after 35years of doing so....)

might be cheaper to have digitalman on fleebay swap them
?
ive never used him but many here have...

cheers.