any ideas?

Anthony

Anthony

Club Member
while at the telegraph cruise. car was fine for a couple hours. then when i decided to drive home it had a "miss" i had to hold the throttle to keep it from idling real low at lights, then while cruising at 35mph, it shut off. i coasted to a lot. and would not start. waited a hour or so for the tow truck. i tried starting it a few times with the throttle open, thinking it loaded up while cruising. checked and had no spark. tow truck get there and i drive it on the flatbed. started right up. (i always have to hold the pedal down for the car to start.)

talking with a few guys we think it the TFI module, so i buy a new one and went for a short ride, stalled 2x. got it home let it sit and it wouldnt start in the garage. pulled the coil wire and checked spark from there, got spark. pulled a few plugs, little rich, dark brown. pulled the TFI module and did some ohm testing i found on the net. passed all of them.

86,306,afr's,stock ecm with mass air conversion,
blow through Pro-M 3" pro tube
72mm turbo

the plugs are autolite ap3924's
msd digital 6
msd coil
stock dist
FMS plug wires

all ignition in in the car under the dash. away from the turbo heat.

anderson's PMS right now. series 1

timing is set @10. spout is in
 
car still wont start. i changed the plugs again. and nothing. so i checked ohms on the coil wire. 2250ohms ( ford racing wires ) they arent that old. so i checked a new MSD wire i have here, was longer than the other wire and was only 114. so i cut the MSD wire and installed it. started for a second, but then died, so i checked #8 wire and it was 3000+ohms. a friend of mine has a new set of ford wires and he checked the #8 for them and its just under 3000ohms.
 
that was #5 injector was open. shorted ground wire. this time it is holding fuel pressure. and the plugs are not wet..


there is a ton of fuel pulled on startup...........but i also had the same problem with the PMS disconnected. i took the PMS out of the system and it did the exact same thing

i checked spark at the coil wire in the car. and there was spark, i can smell the fuel after cranking. i will try the noid light on a random injector tonight. but if i have fuel and spark, there has to be a mechanical problem.
 
I dont think so, borrow someones before you buy new.

what size injectors are you running? i have like 40% fuel removed while cranking with 42# injectors and it fires right up. I do need to swap to 60's though because they are too small up top..
 
it should start with the PMS removed, which it didn't. I have 60's and it ran and started just fine until coming home from the cruise. Was at the cruise for 2-2.5 hours. Had driven it all around my town, to Monroe and back . It would start without a maf right? Now it doesnt want to start.

Think the digital 6 is bad? The light comes on with key, and blinks when cranking
 
yeah just run the stock ignition for now to see if that helps.

it should start without the MAF but run rough, if the maf is reading way wrong it could keep it from starting though while its plugged in.
 
i texted the poo out of svtsinr today.

here is what i am finding/thinking

noid light back on the injectors........ when cranking light blinks fast and not real bright. way to fast IMO. so i pulled the ecm and tried 2 others that i have sitting here. they are speed density ecm's, so i checked on line diagrams and the wires/pins are the same between all. does the same thing..... so that means its in the wiring........correct? started cutting the harness open. would have to be off the power side correct? since the power wires are all common and the ecm grounds to open the injector. 3 ecms and the same thing. and all the wires are separate for the grounds.

or what do yo think?
 
avbcon12 said:
I dont think so, borrow someones before you buy new.

what size injectors are you running? i have like 40% fuel removed while cranking with 42# injectors and it fires right up. I do need to swap to 60's though because they are too small up top..
Click to expand...

sorry for butting in but a friend of mine has a set of 60# injectors he wants to sell if your interested
 
Anthony said:
i texted the poo out of svtsinr today.

here is what i am finding/thinking

noid light back on the injectors........ when cranking light blinks fast and not real bright. way to fast IMO. so i pulled the ecm and tried 2 others that i have sitting here. they are speed density ecm's, so i checked on line diagrams and the wires/pins are the same between all. does the same thing..... so that means its in the wiring........correct? started cutting the harness open. would have to be off the power side correct? since the power wires are all common and the ecm grounds to open the injector. 3 ecms and the same thing. and all the wires are separate for the grounds.

or what do yo think?
Click to expand...

the injectors open/shut really quickly, are you sure its "too fast"? for the car to completely shut off while driving it woul dhave to knock out many injectors because if you drop one or even 2 cylinders the car wont just stop, it will bog big time but not stop. you said you smell fuel and the plugs look rich, i dont think its fuel related...

pull each plug one by one and check for spark (healthy) at the plug, not just the coil.
 
Last edited:
spark looks kinda weak. not too bad though.

with the plug in #8 plug wire. i can see when the plug fires. theres a pause then again.

the noid light just keeps blinking. nonstop. it shouldnt open on the staat of the exhaust stroke should it?
 
what about fuel delivery? whats the fuel pressure?

if the spark isnt white/ blue its too weak and there's something going on...
 
hmm... its timed correctly? are you sure there isnt anyway it could have moved (dist. not bolted down all the way)?

whats the compression on every cylinder?
 
125/130

i didnt check #3. but all others.

10 degress. i marked it at the base and put it right back. but that cant be it as, the car had already died. thats when i was trouble shooting the TFI module. replaced and tested the replacement.
 
i jut put the noid light on my marauder and it blinks bright as it cranks. and no where near as fast as the mustang. and then when the marauder starts it blinks fast like the mustang does while cranking. so while cranking the mustang the injector is opening as fast as the marauder does while running
 
are you sure the ground for the ECM is good/ secure???

125/130 is kinda low but not bad, i guess it depends on how the engine was setup.
 
Last edited:
You must log in or register to reply here.
Back
Top