1983 GXL 5.0 conv, Restarting help - Ford Mustang Forum
 
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post #1 of 12 (permalink) Old 11-14-2012 Thread Starter
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1983 GXL 5.0 conv, Restarting help

ok I have a few wires to figure out for the sending unit and things like that, but the car runs fine, the problem I have right now is that if I drive it 5 minutes then turn the car off, and try to start it again it wont start. not sure what that means, i hear the fuel pump, when trying to start it, it acts like it is not getting any spark or any fuel.

what this is is a 83 5.0 that i converted to efi (maf)

My 1st test drive i drove it about 2.7 miles to get gas and it sat about 5 minutes, but it did start up that time. All the other test drive are under a mile... I am going to drive it 8 miles later today. and try to restart it when I get back home.

It seems if i let it sit about 15 minutes it'll fire again.

any ideas to check for?
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post #2 of 12 (permalink) Old 11-14-2012
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I'd check for spark when it wont start and go from there.It may be fuel but probably is spark related.What type distributor/system are you using? Stock or aftermarket?
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post #3 of 12 (permalink) Old 11-17-2012 Thread Starter
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new stock distributor with msd cap, new stock coil. I did check the coil with test light and it was on. I guess I need to go buy one of those spark plug tester tool.

I can hear the pump kicking on, and my buddy told me he hears it when I am cranking.

also the car stalls if i do not let it warm up. I let it run about a minute and backed out and when i put it in drive it stalled. that means it wont start again for 10 to 15 minutes.

I did do about a 8 mile drive and when I got home, I turned it off. and in 5 seconds, I tried to restart it and it started back up. I turn it off, and in 5 sec. I tried to start it again, and it would not start. any time I have drove it over 2.5 miles it starts back up. weird for me to...
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post #4 of 12 (permalink) Old 11-17-2012 Thread Starter
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can a vacuum leak or vacuum lines hooked up wrong have any thing to do with this?
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post #5 of 12 (permalink) Old 11-17-2012
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Do you have O2 sensors installed and what computer are you using?
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post #6 of 12 (permalink) Old 11-18-2012 Thread Starter
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o2 yes, a 89-90 ecm
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post #7 of 12 (permalink) Old 11-19-2012 Thread Starter
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Ok, so I check for a spark when the car won’t start, and I have spark but it does not seem to be right, seems off ( more on that soon).

Next I check the fuel pump, With a test light when starting it, it is blinking.
I then did a volt test, when I turn the key on and the pump primes I get like 11.3 volts. When starting the car the volts go from .07 to 3.xx back to .o7 back to 3.xx volts(like its blinking)

So what I did next is wire the fuel pump with the battery direct when trying to start the motor.

That did not start the motor.( most likely the spark is weak)blinking with power)

So what I think is happening is the starter and the coil(spark plug- I tested) are blinking like power on power off. Maybe at times it starts cuz spark and gas line up once in a while and the motor fires??? When the car is running I do not get any blinking…

Now I have the ecm relay, fuel pump relay and ecm all together on the pass. kick panel side, I hear them clicking when I an turning the motor over to start it(like they are blinking), my any lights in the cluster also blink with the clicking noise.

I have to be missing a power source somehow…

Any ideas???
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post #8 of 12 (permalink) Old 11-20-2012
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Are you using a CCRM (constant control relay) with the ECM?
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post #9 of 12 (permalink) Old 11-21-2012 Thread Starter
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I have no clue. How do I know if I am or if I am not? I'll look in to what this means.

only have 3 relays, fuel, a/c speed, and the one that is by the ecm, not sure what that is called. I can only guess that is the one you must be talking about???
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out of town ---will get back asap
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Sorry no ccrm relay on your year.Mixed this car with 94/95.
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Is this a complete tank swap from a EFI year? With in-tank pump? Are you using the correct pump? Check to make sure you are maintaining pressure(39psi). What I'm getting at is you're not running a pump for a carbureted or CFI that requires less pressure? '83 non HO was CFI (unsure of what pressure is required)Check for pinched fuel lines. Filter?

1992 GT 331, TFS heads, Eldelbrock intake, E-303, 24 lb inject, MSD dist,coil,6-al box. '03 Cobra wheels,Nittos,SN-95 5-lug/rear disc conversion,Truetrac 31 spline locker,Baer 13" fronts
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