please help cranks but wont start!!! - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 5 Old 02-01-2016, 03:46 AM Thread Starter
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please help cranks but wont start!!!

Forgive if im posting in the wrong spot im new to the site but here goes thanks in advance for any and all help.

Car cranked, started, and ran fine. Pulled the distributor to install a pro billet msd unit car then cranked fired up ran a few seconds and died and would not start back up just cranked away. So i put the old distributor back in and nothing just cranks. So i have another 5.0 so i tried both the new msd unit and original unit i pulled out of the other car in my second other Foxbody both worked without issue and ran my second fox just fine. I have checked with a spark tester , i have spark i have checked for fuel i have fuel i have did a noid light test i have pulse i have checked the brand new coil it is good i have tried to fire it with starting fluid nothing it just cranks i have checked compression i got 165 across the board. i replaced the ignition switch with a new one nothing just cranks. I have tried the computer in my other fox it works fine. I have swapped the fuel relay out from my other fox nothing just cranks. The fuel pump is brand new has 15 miles on it a 190 walbro also it does turn on and prime i have checked using the manual over ride test port under the hood it works. This car just got a fresh motor put in it top to bottom new everything it has been drivin and broken in about 30 miles and has never gave me a issue. BUT never gave me a issue other then this exact same situation from day one when the new motor was getting fired for the first time. It did this same crap. I checked and checked and checked and finally i took the brand new msd distributor out and threw the original back in and well well well it fired up right came to life and never gave me another issue. So i figured the msd distributor was broken day one out of the box. I sent it back to msd and got a replacement and here we are again with the second brand new msd pro billet. I took my perfectly running car swapped out the original factory ford distributor out to put the brand new msd in and now the damn thing wont start and on top of that i throw the original back in and It didnt make any difference neither will run in the car but yet they run in my other car no problems. And yes i have the distributor in correctly and its not 180 out. The only thing i can think of is its a wiring issue because i did nothing but unplug the tfi harness from the distributor and swapped the darn distributors out. Day one and this time both got me the same results. Just cranks away. I tested the number 4 wire on the tfi harness i have 12 volts with key on so the computer is sending signal correct. And i tested the number 6 pin on the tfi harness and got 12 volts so ive got ground. Ive read over and over and followed the cranks but wont start checklist its not seeming to help my situation. The motor ran awesome tons of power all day long with not one issue other than this same issue im having during it first start up and now again and both times same exact symptoms. The motor is a 302
Comp stage 3 cam
Afr 165 heads
1.7 rockers
Tmoss ported cobra intake
Adjustable fuel regulator
70mm throttle body
Full accessories
Ac
Smog
Egr
Nothing has been gutted or hacked on everything is brand new and ive checked all connections salt and pepper ect. I seem to have power everywhere i turn yet it wont run. It trys and it sputters ever so lightly. Its so very odd. I had my brother over to help me do the compression test got done after doing all cylinders said hell try it turned the key and bam it ran and stayed running for a minute i turned it off went to restart it and nothing just cranks away. I built this car im buy no means a master mechanic or a know everything guy but i built many motors and hotrods and for the life of me cannot figure this one out. Im hoping maybe someone will have some insight here because im at a lose. Just a though but this car is a 90 gt convertible. And it has a factory ford alarm system with keyless entry in it. Its always worked never gave me a issue but maybe something has crapped out on it or on the fritz. it fired ran then shut it off and wont fire up again. And it did this same crap day one when i went to fire the new motor i did nothing but pull the brand new msd distributor out threw the stocker back in and bam shes alive and never looked back or had a issue. Yet here we go again with doing nothing but touching the distributor and its dead in the water What the heck help please any advise is much appreciated.

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post #2 of 5 Old 02-01-2016, 12:55 PM
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Originally Posted by smigstang View Post
Forgive if im posting in the wrong spot im new to the site but here goes thanks in advance for any and all help.

Car cranked, started, and ran fine. Pulled the distributor to install a pro billet msd unit car then cranked fired up ran a few seconds and died and would not start back up just cranked away. So i put the old distributor back in and nothing just cranks. So i have another 5.0 so i tried both the new msd unit and original unit i pulled out of the other car in my second other Foxbody both worked without issue and ran my second fox just fine. I have checked with a spark tester , i have spark i have checked for fuel i have fuel i have did a noid light test i have pulse i have checked the brand new coil it is good i have tried to fire it with starting fluid nothing it just cranks i have checked compression i got 165 across the board. i replaced the ignition switch with a new one nothing just cranks. I have tried the computer in my other fox it works fine. I have swapped the fuel relay out from my other fox nothing just cranks. The fuel pump is brand new has 15 miles on it a 190 walbro also it does turn on and prime i have checked using the manual over ride test port under the hood it works. This car just got a fresh motor put in it top to bottom new everything it has been drivin and broken in about 30 miles and has never gave me a issue. BUT never gave me a issue other then this exact same situation from day one when the new motor was getting fired for the first time. It did this same crap. I checked and checked and checked and finally i took the brand new msd distributor out and threw the original back in and well well well it fired up right came to life and never gave me another issue. So i figured the msd distributor was broken day one out of the box. I sent it back to msd and got a replacement and here we are again with the second brand new msd pro billet. I took my perfectly running car swapped out the original factory ford distributor out to put the brand new msd in and now the damn thing wont start and on top of that i throw the original back in and It didnt make any difference neither will run in the car but yet they run in my other car no problems. And yes i have the distributor in correctly and its not 180 out. The only thing i can think of is its a wiring issue because i did nothing but unplug the tfi harness from the distributor and swapped the darn distributors out. Day one and this time both got me the same results. Just cranks away. I tested the number 4 wire on the tfi harness i have 12 volts with key on so the computer is sending signal correct. And i tested the number 6 pin on the tfi harness and got 12 volts so ive got ground. Ive read over and over and followed the cranks but wont start checklist its not seeming to help my situation. The motor ran awesome tons of power all day long with not one issue other than this same issue im having during it first start up and now again and both times same exact symptoms. The motor is a 302
Comp stage 3 cam
Afr 165 heads
1.7 rockers
Tmoss ported cobra intake
Adjustable fuel regulator
70mm throttle body
Full accessories
Ac
Smog
Egr
Nothing has been gutted or hacked on everything is brand new and ive checked all connections salt and pepper ect. I seem to have power everywhere i turn yet it wont run. It trys and it sputters ever so lightly. Its so very odd. I had my brother over to help me do the compression test got done after doing all cylinders said hell try it turned the key and bam it ran and stayed running for a minute i turned it off went to restart it and nothing just cranks away. I built this car im buy no means a master mechanic or a know everything guy but i built many motors and hotrods and for the life of me cannot figure this one out. Im hoping maybe someone will have some insight here because im at a lose. Just a though but this car is a 90 gt convertible. And it has a factory ford alarm system with keyless entry in it. Its always worked never gave me a issue but maybe something has crapped out on it or on the fritz. it fired ran then shut it off and wont fire up again. And it did this same crap day one when i went to fire the new motor i did nothing but pull the brand new msd distributor out threw the stocker back in and bam shes alive and never looked back or had a issue. Yet here we go again with doing nothing but touching the distributor and its dead in the water What the heck help please any advise is much appreciated.
here is my .02 so take it for what its worth. send the msd distributor back and get your money back. it will do nothing other then aggravate you. been there done that and plenty of other threads you can read stating as such. if you like the look of it polish the stock distributor (what i did).

it is critical that the distributor is phased properly since it not only provides spark it also controls injector pulse. pull #1 spark plug and crank the motor over until you hear the compression stroke. using a bump starter or by hand put the timing pointer at zero. that is TDC. drop the distributor in so the rotor is pointing at the number one post on the cap (also where the pickup is internally). from there if it doesn't fire you have something else going on but considering you didn't have any issues until you touched the distributor its probably safe to say that is where the issue is


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post #3 of 5 Old 02-01-2016, 05:22 PM Thread Starter
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Ive checked to insure the distributor is stabbed correctly multiple times which it is. I just dont see what the deal is here.
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post #4 of 5 Old 02-01-2016, 10:59 PM
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you say you have spark, you added fuel and got no start.

then you have NO compression, on all cylinders..........

really, you checked spark with a tester, on the end of each lead, and got 20KV on each spark?

you have fuel pressure and injector pulse? for sure?

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #5 of 5 Old 02-01-2016, 11:34 PM Thread Starter
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I did a compression test on each cylinder and it was 160 on each one. I used a spark tester tool from the coil to distributor and have spark from the coil to the distributor. I used the tester from the distributor to the plug end on cylinder one only and it had spark. I did not check each cylinder i will check each cylinder for spark tonight after work. I have fuel pressure 40 psi. I have injector pulse verified by a noid light test. This is why i dont get what the deal is. It cranked for days on end while messing with it trying to figure it out. Then i did the compression test and got done and said what the heck ill try it and it fired right up and ran until i Shut it off and i turned right around to restart it and nothing but endless cranking.
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