Won't Start!!!

mustang93 · 04-22-2004, 10:20 PM

Hello,

I have a 1993 ford mustang convertible that I have just changed over from a 4 cylinder to a V-8. It runs great once you first start it, but if you cut it off it won't start back up . It just turns over. If you put the car in second gear and push it off it will start and run fine. I have changed the coil, distributor, wiring harness, and computer and various other things. If anyone has any other suggestions please let me know.

Thanks in advance

canukracer · 04-22-2004, 11:18 PM

so the engine turns over but won't start right? so lets see if you turn the key to the run and push it, it starts right? = no power to coil in start mode ,try a hot wire to coil then turn over if starts recheck power leads at solinoid {spell check]

mustang93 · 04-23-2004, 07:12 AM

Thanks, but unfortunately we have already tried that. If we take the coil wire off (the one that runs from the coil to the distributor) you can see the spark if you hold it up against some metal or put a screwdriver in the end of it. I did try to run a hot wire to the coil but my coil has two hot wire running to it. A yellow and a red and both are hot. I don't see a ground, so I am assuming that it get ground once it is attached to the car. Which wire should I run the hot wire to the red or the yellow????

canukracer · 04-23-2004, 05:34 PM

my wireing picture shows r/lg thinking that is red and lightgreen wire so red i'd say, but do you have spark when your cranking it over?what does the car run like when it does start does it smell rich? maybe it's flooding? if so try a clear flood mode keep holding the gas pedal to the floor when cranking it over ,also I see the ecc power relay is not the same for a 4cly.to 5.0L? have your searched the web for engine swaps for your car possible some differances/ igntion switch to ecc power relay then to coil that is the route.

mustang93 · 04-23-2004, 09:48 PM

Thanks for the info. I have another question. Today we played around with different computers. The one that was in the car came with the motor and I was told that it came out of a 93 5.0 with a manual transmission. I was also told that it didn't make a different whether or not the computer came out of an automatic or a manual as long as it was being used in a manual. We put another computer in my car that came out of my friends car and my car ran fine for a while and than started doing the same thing again. We than took my computer that was in my car and put it in his and his car ran fine with my computer in it. Do you know if there is a difference between an A9L computer and A9O Computer. My car has mass air and I know that you have to have a computer that is for mass air. But is it true that it doesn't matter which type of computer you have to use.

Thanks in advance

Stangbanger86 · 04-24-2004, 12:07 AM

Hey check your fuel pump and fuel filter.

HISSIN50 · 04-24-2004, 08:28 PM

SB, you and i think alike. Mustang 93, you said you see spark, right? so do you have fuel?
are you sure your priming the FP?

what is FP when cranking?

computers, as far as i know, you are right (you can use any MAF puter in a stick, but only an AOD puter if using an aod).

good luck.

mustang93 · 04-24-2004, 08:41 PM

We played with that car all day today (Sat 4/24). We changed about 5 different computers today. A friend of mine thinks I need to get a computer called an A9L (????). But we did fine this out today. IF you crank the car and let it run for a few minutes and than cut if off, it's not going to crank. But if you disconnect the fuel pump and try to crank it, it will hit like it wants to crank. After doing that you can plug the fuel pump back up and than it will crank. That is why we think it has something to do with the computer. One of my friends has a Snap-On Scanner and it would not work on my car. If you turn the switch on in my car the computer (SCANNER) goes off.(????) That's another reason we thought it might be the computer. We can plug a computer that doesn't have mass air on it an the Scanner will stay on. The car will run but it runs poorly. Do you know if this car has a COMPUTER CONTROL RELAY????

HISSIN50 · 04-24-2004, 08:50 PM

if you mean an EEC relay, yes it should. pass kick panel above the puter.

for the rest, im not following. the car should crank with or without a FP relay. are you using the ignition to crank it, or jumping the solenoid (try the solenoid, as it takes some variables out of the equation).
good luck.

canukracer · 04-24-2004, 10:49 PM

mustang 93 do you now if it's a cobra engine? if so this could be the problem //////// i see in your last post you say when u disconnect the fuel pump it hits like it wants to crank? do you mean fire? by disconnecting the pump you are losing the fuel psi like i said by using the clear flood method, do the plugs look wet or rich? your friend could be right with the A9L.

mustang93 · 04-24-2004, 11:42 PM

The plugs are really wet if you take one out. And when I say trying to hit, i do mean crank. And as far is it being a cobra motor I'm not to sure. I bought the motor from a guy in Texas. He said his car had been HIT in the rear. I do know that it has dome piston and it has a really big cam but I'm not sure which one. I'm sorry but i don't know what the clear flood mood is or how to do it. More information about that would be GREATLY appreicaiated!! And if you can ANSWER this it might help. Like I said before, my friend has a snap-on scanner and it will come on when he first plugs it up to the plug on the car. NOW he has to get his power from the battery on the car and he gets his ground through the plug on the car, and like i said it works fine until you turn the switch on the car to start it and than it turns itself OF(Snap-on Scanner)!!! This is not suppose to happen. It's suppose to stay on in order to diagnose the car. Can the be a short in the ignition or other wire in the ignition that may be strong enough to cause the computer to act up and cause the car to do what it's been doing. WHAT MAKES YOU THINK THAT IT MIGHT BE A COBRA MOTOR?????

THAT WOULD BE A GOOD THING

HISSIN50 · 04-25-2004, 12:55 AM

ok, im a little unclear still (you kids talk differently than us older folks) :-)

so when you are experiencing your problem, the motor does not even crank. so it is like you are not even turning the key....right?

what canukracer was talkin about with the clear flood: if you floor the gas pedal while cranking, the puter kills the injector pulse. allows one to clear a flooding.

i would be lookin elsewhere for your problem. you have wet plugs, ergo fuel.

the scanner issue could be an incompatible part from your swap. im not conversant with the incompatible components, but others are. that also happens when a pin has worked loose on the puter harness, but it is rare. i would really check that EEC relay...make sure you have one for a V8.

im kinda lost on the rest. obviously, you need spark, fuel and air. it is likely gonna be something simple. this may sound stupid, but have you tried a jumper battery? the fact that it starts when compression started but not cranked, makes me think it is a battery or cable issue.

enough rambling again. good luck.

04-22-2004, 10:20 PM	#1
mustang93 Registered Member Join Date: Apr 2004 Location: memphis Posts: 10	Won't Start!!! Hello, I have a 1993 ford mustang convertible that I have just changed over from a 4 cylinder to a V-8. It runs great once you first start it, but if you cut it off it won't start back up . It just turns over. If you put the car in second gear and push it off it will start and run fine. I have changed the coil, distributor, wiring harness, and computer and various other things. If anyone has any other suggestions please let me know. Thanks in advance

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04-22-2004, 11:18 PM	#2
canukracer Registered Member Join Date: Jul 2003 Location: alberta canada Posts: 108	so the engine turns over but won't start right? so lets see if you turn the key to the run and push it, it starts right? = no power to coil in start mode ,try a hot wire to coil then turn over if starts recheck power leads at solinoid {spell check]

04-23-2004, 07:12 AM	#3
mustang93 Registered Member Join Date: Apr 2004 Location: memphis Posts: 10	Thanks, but unfortunately we have already tried that. If we take the coil wire off (the one that runs from the coil to the distributor) you can see the spark if you hold it up against some metal or put a screwdriver in the end of it. I did try to run a hot wire to the coil but my coil has two hot wire running to it. A yellow and a red and both are hot. I don't see a ground, so I am assuming that it get ground once it is attached to the car. Which wire should I run the hot wire to the red or the yellow????

04-23-2004, 05:34 PM	#4
canukracer Registered Member Join Date: Jul 2003 Location: alberta canada Posts: 108	my wireing picture shows r/lg thinking that is red and lightgreen wire so red i'd say, but do you have spark when your cranking it over?what does the car run like when it does start does it smell rich? maybe it's flooding? if so try a clear flood mode keep holding the gas pedal to the floor when cranking it over ,also I see the ecc power relay is not the same for a 4cly.to 5.0L? have your searched the web for engine swaps for your car possible some differances/ igntion switch to ecc power relay then to coil that is the route.

04-23-2004, 09:48 PM	#5
mustang93 Registered Member Join Date: Apr 2004 Location: memphis Posts: 10	Thanks for the info. I have another question. Today we played around with different computers. The one that was in the car came with the motor and I was told that it came out of a 93 5.0 with a manual transmission. I was also told that it didn't make a different whether or not the computer came out of an automatic or a manual as long as it was being used in a manual. We put another computer in my car that came out of my friends car and my car ran fine for a while and than started doing the same thing again. We than took my computer that was in my car and put it in his and his car ran fine with my computer in it. Do you know if there is a difference between an A9L computer and A9O Computer. My car has mass air and I know that you have to have a computer that is for mass air. But is it true that it doesn't matter which type of computer you have to use. Thanks in advance

04-24-2004, 12:07 AM	#6
Stangbanger86 Registered Member Join Date: Sep 2003 Location: Slidell, La Posts: 31	Hey check your fuel pump and fuel filter.

04-24-2004, 08:28 PM	#7
HISSIN50 Registered Member Join Date: Mar 2004 Posts: 62	SB, you and i think alike. Mustang 93, you said you see spark, right? so do you have fuel? are you sure your priming the FP? what is FP when cranking? computers, as far as i know, you are right (you can use any MAF puter in a stick, but only an AOD puter if using an aod). good luck.

04-24-2004, 08:41 PM	#8
mustang93 Registered Member Join Date: Apr 2004 Location: memphis Posts: 10	We played with that car all day today (Sat 4/24). We changed about 5 different computers today. A friend of mine thinks I need to get a computer called an A9L (????). But we did fine this out today. IF you crank the car and let it run for a few minutes and than cut if off, it's not going to crank. But if you disconnect the fuel pump and try to crank it, it will hit like it wants to crank. After doing that you can plug the fuel pump back up and than it will crank. That is why we think it has something to do with the computer. One of my friends has a Snap-On Scanner and it would not work on my car. If you turn the switch on in my car the computer (SCANNER) goes off.(????) That's another reason we thought it might be the computer. We can plug a computer that doesn't have mass air on it an the Scanner will stay on. The car will run but it runs poorly. Do you know if this car has a COMPUTER CONTROL RELAY????

04-24-2004, 08:50 PM	#9
HISSIN50 Registered Member Join Date: Mar 2004 Posts: 62	if you mean an EEC relay, yes it should. pass kick panel above the puter. for the rest, im not following. the car should crank with or without a FP relay. are you using the ignition to crank it, or jumping the solenoid (try the solenoid, as it takes some variables out of the equation). good luck.

04-24-2004, 10:49 PM	#10
canukracer Registered Member Join Date: Jul 2003 Location: alberta canada Posts: 108	mustang 93 do you now if it's a cobra engine? if so this could be the problem //////// i see in your last post you say when u disconnect the fuel pump it hits like it wants to crank? do you mean fire? by disconnecting the pump you are losing the fuel psi like i said by using the clear flood method, do the plugs look wet or rich? your friend could be right with the A9L.

04-24-2004, 11:42 PM	#11
mustang93 Registered Member Join Date: Apr 2004 Location: memphis Posts: 10	The plugs are really wet if you take one out. And when I say trying to hit, i do mean crank. And as far is it being a cobra motor I'm not to sure. I bought the motor from a guy in Texas. He said his car had been HIT in the rear. I do know that it has dome piston and it has a really big cam but I'm not sure which one. I'm sorry but i don't know what the clear flood mood is or how to do it. More information about that would be GREATLY appreicaiated!! And if you can ANSWER this it might help. Like I said before, my friend has a snap-on scanner and it will come on when he first plugs it up to the plug on the car. NOW he has to get his power from the battery on the car and he gets his ground through the plug on the car, and like i said it works fine until you turn the switch on the car to start it and than it turns itself OF(Snap-on Scanner)!!! This is not suppose to happen. It's suppose to stay on in order to diagnose the car. Can the be a short in the ignition or other wire in the ignition that may be strong enough to cause the computer to act up and cause the car to do what it's been doing. WHAT MAKES YOU THINK THAT IT MIGHT BE A COBRA MOTOR????? THAT WOULD BE A GOOD THING

04-25-2004, 12:55 AM	#12
HISSIN50 Registered Member Join Date: Mar 2004 Posts: 62	ok, im a little unclear still (you kids talk differently than us older folks) :-) so when you are experiencing your problem, the motor does not even crank. so it is like you are not even turning the key....right? what canukracer was talkin about with the clear flood: if you floor the gas pedal while cranking, the puter kills the injector pulse. allows one to clear a flooding. i would be lookin elsewhere for your problem. you have wet plugs, ergo fuel. the scanner issue could be an incompatible part from your swap. im not conversant with the incompatible components, but others are. that also happens when a pin has worked loose on the puter harness, but it is rare. i would really check that EEC relay...make sure you have one for a V8. im kinda lost on the rest. obviously, you need spark, fuel and air. it is likely gonna be something simple. this may sound stupid, but have you tried a jumper battery? the fact that it starts when compression started but not cranked, makes me think it is a battery or cable issue. enough rambling again. good luck.