'94 mustang gt not firing need help????????

[natedawgg94]

Like the title says got the motor installed and drove for bout 300 miles or so back and forth to work etc... Coming home leaving a stop sign the engine backfired twice then picked back up. Car went bout 1/4 mile or so started skipping and died. Has yet to fire again. So here is whats been done/tested. coil has been swapped with working coil and coil has power to it. dizzy was just swapped today with no luck. control module on the pass. fender has been tested in the cobra works fine. cap and button have been replaced with new ones and have also checked the grounds. checked fuses in engine bay and has fuel pressure. open for ideas now......:popcorn:

[Italian LX]

Your ECU could have crapped out on you. :shrug:

[natedawgg94]

yeah that seems to be what i'm getting from searching online or eec relay???? would be nice if could check the cpu....

[EHardy1971]

Have you checked the pickup in the distributor? Is the cap and rotor good?

[Italian LX]

Have you checked the pickup in the distributor? Is the cap and rotor good?

He said he swapped the distributor already.

...dizzy was just swapped today with no luck.

[QWKSNKE]

yeah that seems to be what i'm getting from searching online or eec relay???? would be nice if could check the cpu....

take the one out of the cobra. All it takes is a 10 mm socket (and your dad not around since it is his car :D)

[natedawgg94]

anyone got a spare computer laying around???? has a A9L in it.

[natedawgg94]

yeah and i could use the chip tooo he would love that :jester:

[QWKSNKE]

anyone got a spare computer laying around???? has a A9L in it.

an A9L? Did you do the swap? In that case don't swap EEC's the wiring is different between fox's and sn95's

[natedawgg94]

seems like thats what i put in it awhile back to bad i sold the other 1

[natedawgg94]

whats diff in the fox's and the sn95's????

[QWKSNKE]

whats diff in the fox's and the sn95's????

If I recall correctly (it has been years since I have read anything on it) the pins controlled different functions.

Like I said, the last time I read anyting on the fox computer upgrade was in the mid 90's before 'tuning' got popular

[QWKSNKE]

You have to re-pin it and....

Not only do you need a fan controller and the recommended aftermarket ignition, but you'll also need a BAP sensor (just like a MAP sensor but leave the vacuum port open to the atmosphere instead of routing it to vacuum). I definitely felt a throttle response change and shift timing

[natedawgg94]

no i remember i just swapped with a ecu out of a cobra. if i can't find 1 to try before the rain ends i guess i'll get out and take the 1 out of the cobra.

[EHardy1971]

He said he swapped the distributor already.
That does'nt mean the cap and all is good though,especially if it's used.

[natedawgg94]

cap and button both are new

[EHardy1971]

Ok,is the rotor turning?

[natedawgg94]

yup she spinning also

[coupe]

What is the "control module" you checked?
First thing I thought of was the voltage regulator on the alternator.
Then I thought maybe you are out of gas???

Did you turn over the engine and check a spark plug to see if it's firing? If so, then you're not getting fuel. Pump maybe?

[natedawgg94]

control module on the passenger fender. she spins over and have a timing light on #1 wire but have tried other wires also. still not firing

[jah81592]

My vote is for the PIP sensor inside the distributor. This is checked on the ac scale preferably with a analog meter. Hmmm, analog meter? Haven't seen one of those in a while. LOL:banana2:

[natedawgg94]

the distributor has been replaced with 1 from a running car. next option plz...

[coupe]

When you turn the key, does the fuel pump prime? What year and model is this car?

[TheJeanyus]

What year and model is this car?
Did you read the thread title? :doh:

'94 mustang gt

[coupe]

:slap: and he says he has an A9L computer in it!

[coupe]

I have had a main "POWER RELAY" blow on a foxbody and it did the same thing...It has its own lead to the switched side of the starter solenoid. The relay (on a fox) is up in the kickpanel above the computer. Not sure on the SN95.

[Italian LX]

If the power relay fails, then there would be no signal from the ECU to tell the fuel pump to run. He already said that he has fuel pressure.


Can you hear the fuel pump run when you turn the ignition keyo to the 'ON' (not 'START') position? Does it stop after a few seconds or does it continue to run?

[natedawgg94]

thew fuel pump comes on and primes with switch on don't remember hearing it while turning the engine over.

[Italian LX]

thew fuel pump comes on and primes with switch on don't remember hearing it while turning the engine over.
When you turn the ignition switch to the 'ON' position, does the fuel pump priming eventually stop, or does it keep on running?

[coupe]

Nate.. is it an A9L in the car for sure? Did you reconfigure the pins correctly? If it was just "plugged in," then I would suspect something "decayed" in that 300 miles you drove it and finally gave up the ghost. Maybe a transistor, capacitor, logic chip? :shrug:

[EHardy1971]

I went through this problem in my coupe with the different EEC's.

http://streetstangs.net/showthread.php?t=10583

[natedawgg94]

i was wrong the car does not have a a9l it has a ecu out of a 94 cobra meant to post that when me and lee were discussing it.

[EHardy1971]

How did you check the TFI module? I know you said you checked it,but it sounds suspect to me.

[QWKSNKE]

he swapped it with the one off of his dad's cobra I think

[coupe]

:think: Maybe the SN95 Cobra and GT computers have differences like the fox? Where's Dale?

[natedawgg94]

i know there is some differences in the cobras but not sure exactly what other than fuel. this is the same setup i had with the stock motor only thing that has changed is the motor. i know looking back on the thread it seems that the ecu was changed when i did the motor but it wasn't.

[QWKSNKE]

:think: Maybe the SN95 Cobra and GT computers have differences like the fox? Where's Dale?

there are programming differences but not enough where a car will not run.

Typically the pushrod GT and cobra differences are
Fuel mapping
Timing mapping
MAF transfer curve
speed limiters

As i stated though these differences will not cause a car to crank or be driveable, it just won't run efficiently

[EHardy1971]

:think: Maybe the SN95 Cobra and GT computers have differences like the fox? Where's Dale?
I know for a FACT the wiring harnesses are completely different! I did a V-6 to V-8 swap on a '95 for a guy Geoffrey and I know from work. I acquired a '95 Cobra harness for it,put it in,and it ran like ass. We got another harness from a '95 GT,put it in,and it ran perfect. I read up on those when I did that about three years ago,and there are some differences,but I can't remember what all they are right now though.

[natedawgg94]

k i found a ecu and its on the way should play with the car some tomorrow. did some checking on the relay and they seem to be 80 bucks so hoping its just the ecu.

[natedawgg94]

k just went out to the car when u turn the car on i hear the fuel pump kick on for a minute to prime, the normal lights are on indash. but for some reason the cooling fan is kicking on???? i tried the fuel pump reset in the truck nothing. car spins over fine with no out of the normal sounds. if anyone has any input of questions feel free to call me 256-770-1063

[EHardy1971]

k just went out to the car when u turn the car on i hear the fuel pump kick on for a minute to prime, the normal lights are on indash. but for some reason the cooling fan is kicking on???? i tried the fuel pump reset in the truck nothing. car spins over fine with no out of the normal sounds. if anyone has any input of questions feel free to call me 256-770-1063
That sounds like the CCRM (constant control relay module) is messed up. I have a good one laying around if you want to try it out.

[natedawgg94]

is that the relay that is above the ecu?

[natedawgg94]

yeah if you think that is what it is give me a call tomorrow sometime and i will ride out ur way to get it. let me know what i owe ya if thats it.

[EHardy1971]

No,it's mounted behind the passenger side fender. It looks like a smaller ECU.

[QWKSNKE]

ccrm is next to the fan/radiator I believe

[natedawgg94]

have already checked that 1 i believe its right in front of the strut tower kinda under the CAI???

[EHardy1971]

ccrm is next to the fan/radiator I believe
On the 3.8's,and the GT's it is,but not on the '94-'95 Cobras
have already checked that 1 i believe its right in front of the strut tower kinda under the CAI???
:yup:

[QWKSNKE]

On the 3.8's,and the GT's it is,but not on the '94-'95 Cobras

:yup:

Good. Cause a GT is what he is working on :smartass:

[EHardy1971]

Good. Cause a GT is what he is working on :smartass:
:doh: Ok,I thought he was talking about the location of the CCRM in the Cobra.

[natedawgg94]

well i got the ecu today but i got a few other things going on right now so might be the weekend before i get to try..