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Old 07-09-2011, 04:44 PM   #1
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Won't start - no spark

I've got a 1967 Mustang with a 5.0 EFI from a 1990 mustang (mostly stock for now). I've got an intermittent starting problem - engine cranks, fuel pump runs, I've got fuel to the rail (fuel comes out the schrader valve when depressed during cranking). But it won't fire - won't even try - just cranks and cranks. I pulled a plug wire to test spark, and I'm getting no spark. I leave on vacation tomorrow, so won't have much time until I get back, but I wanted to start compiling a list of troubleshooting diagnostics for 'no spark' issues on these engines. Any help would be greatly appreciated.
Thanks, Tom
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Old 07-09-2011, 04:57 PM   #2
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no spark

What ignition are you using
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Old 07-09-2011, 05:26 PM   #3
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Hmm - looks like a stock replacement. I didn't build this car, so not positive, but there's a box branded "select" with what looks like a condenser next to it. That must be the ignition box. IS there a way to test the ignition box?
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Old 07-09-2011, 05:32 PM   #4
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Just thinking...What is the procedure for pulling fault codes on a 1990 mustang? Hopefully they can be pulled directly at the ECU. Since my car is a 1967, there is no diagnostic port (unless it's in the wiring harness somewhere and currently hidden from me). That seems like a good place to start...
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Old 07-09-2011, 05:55 PM   #5
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spark

Did you have an engine running in the car prior to the 5.0
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Old 07-09-2011, 06:14 PM   #6
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Quote:
Originally Posted by Tom2769 View Post
I've got a 1967 Mustang with a 5.0 EFI from a 1990 mustang (mostly stock for now). I've got an intermittent starting problem - engine cranks, fuel pump runs, I've got fuel to the rail (fuel comes out the schrader valve when depressed during cranking). But it won't fire - won't even try - just cranks and cranks. I pulled a plug wire to test spark, and I'm getting no spark. I leave on vacation tomorrow, so won't have much time until I get back, but I wanted to start compiling a list of troubleshooting diagnostics for 'no spark' issues on these engines. Any help would be greatly appreciated.
Thanks, Tom
Intermittent? Is it when it gets hot? My first guess would be the TFI module on the distributor, or the pick up inside it.
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Old 07-09-2011, 06:22 PM   #7
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Quote:
Originally Posted by Tom2769 View Post
Hmm - looks like a stock replacement. I didn't build this car, so not positive, but there's a box branded "select" with what looks like a condenser next to it. That must be the ignition box. IS there a way to test the ignition box?
That's probably the voltage regulator for the alternator.

To perform code scan, here's what you need to do...
Find the test plug.
Hook up a 12v light from the Self Test Output, to ground.
Hook up a wire from the Self Test Input, to ground.
KOEO self tests, put the key in run, but don't start it, the light you hooked up should start flashing codes (noticed problems first), then will display stored fault codes.

If you can get it started,

Watch the light. Normally, the light would flash 4 times to let you know that the computer is I.D.ing an 8 cylinder engine. Step on the brake pedal and turn the wheel 180 degrees (if you have power steering). It will then go through the self test.

This page will show you what the test plugs look like. And how to hook up the light. This site also has the 2 digit trouble codes that your computer should give you.
Ford Fuel Injection ยป How To Run a Self-Test
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Old 07-09-2011, 10:07 PM   #8
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Clubcart, I purchased this car with the 5.0 in it, so no, I didn't have an engine running in it prior to the 5.0.

86Vicky: Yes it's intermittent - sort of - but you called it with the hot issue. Prior to today, it would always start right up when cold, and then hard start when hot. I could usually get it started eventually when hot, but with a LOT of cranking. In fact, it started right up just last Saturday (it was cold and I didn't take it out of the garage). [Also, may not be related - last time I had it out, I got a pretty serious stumble on acceleration - just once.] But today NOTHING. I'll put TFI and dizzy pickup on the list of things to check first.

Wow - love that fordfuelinjection.com site - thanks for that! Looks like I've got a LOT of reading to do. And I'll pull codes and perform the self test when I get back from vacation. Thanks for the direction - very much appreciated.
Tom
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Old 07-10-2011, 12:09 PM   #9
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THis should help

Purpose of this Troubleshooting Procedures Database
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Old 07-10-2011, 03:10 PM   #10
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Check the ignition coil the distributor if nothing there probly computer
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