1995 Ford Mustang no spark

Tiny
MSHROPSHIRE
  • MEMBER
  • 1995 FORD MUSTANG
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 96,000 MILES
When I got this car It had blown head gaskets and warped heads. It would start. I replaced the heads and it wouldn't start. The first problem was the coil had shorted out so I replaced the coil pack and the crank sensor and the ignition control module. I still have no spark. I have traced all the lines and tested them and they are all good. I have 12 volts at the coil and the coil gets warm. I have tried everything I can think of. Any help is greatly appreciated.
Tuesday, December 23rd, 2008 AT 9:55 PM

15 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok first I need some info and the more the better. How did you determine that you have no spark? What all have done and what tests have you performed? How did you test the cranksensor? Have done any scans and if so is there any codes? Get back to me with as much as you can and we will go from there.
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Friday, December 26th, 2008 AT 9:42 AM
Tiny
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I have used a spark tester to confirm no spark. There are no trouble codes. I used a multi-meter to test the crank sensor. I have traced all of the lines in the wire harness back to the disconnect block at the firewall and tested them using a multi meter.
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Friday, December 26th, 2008 AT 9:54 AM
Tiny
RACEFAN966
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Ok good so far now I need you to do some test on the ignition module on the right front apron. All these tests are with key on engine off, Pin 8 the red wire make sure there is power to it.
I also need you to test the PCM for power too, with you digital volt meter with key on engine off check for power between pin 71 and 97. Let me know what you find and we will take it from there ok. Here is a pic of the PCM connector.


https://www.2carpros.com/forum/automotive_pictures/249564_Graphic_19.jpg



If all this is ok then we need to check the cam sensor under the coil pack this is what initiates firing order and spark.
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Friday, December 26th, 2008 AT 9:41 PM
Tiny
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I am getting 0.12 as the reading on the pcm harness.
I am getting 12 volts on pin 8 of the ignition control module harness
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Saturday, December 27th, 2008 AT 5:12 PM
Tiny
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I tested further and it turns out that there is NO voltage at the PCM. What do I do now?
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Saturday, December 27th, 2008 AT 6:19 PM
Tiny
RACEFAN966
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I am thinking if the power wire is good then it may be the pcm power relay. This is built into the Constant Control Relay Module. It is mounted on a braket behind the engine coolant reservoir. Check to make sure it didn't get unpluged when you did the heads and check for any damaged wire to it. Let me know how it goes and take it from there.
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Sunday, December 28th, 2008 AT 10:23 PM
Tiny
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I traced the lines and checked the connection and everything was good. While I had the pcm when I turned the ignition on thr fan began running. Now I have 12 volts at the pcm but still no spark. So I replaced the cam position sensor just to make sure it wasn't bad. Still no spark. Is it possible that the relay is bad or that the PCM has shorted out?
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Monday, December 29th, 2008 AT 7:49 AM
Tiny
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Ok. I checked the wires and they were all ok. I got another CCRM and installed it but there is still no spark. What else could it be besides a bad PCM?
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Monday, December 29th, 2008 AT 4:29 PM
Tiny
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First let me say I am sorry it took a while to get back to you I have been snow blowing like crazy here in north Idaho. I got another foot just today and we have more then 3 feet on the ground and more to come.
With that said yes it could be a bad PCM. With what I can find the test you did should have determind it. If there is power when you check the two term. Then the pcm is the only other possibility. I hate to pronounce a pcm bad but it looks like that may be the problem. You did check the ground to pcm right. If you are not sure make sure the ground is good first then make that disition to replace it.
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Tuesday, December 30th, 2008 AT 12:01 AM
Tiny
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I understand about the snow. Ok I checked the ground and it was good. So I got another PCM and tried that but I still have no spark. I am completely out of ideas.
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Tuesday, December 30th, 2008 AT 12:01 PM
Tiny
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Ok.I found the problem. One of the wires had the insulation burnt off. I fixed that and got it started and I am only running on 3 or four cylinders. I am getting 2 trouble codes. One says that there is a cylinder 3 missfire and the other indicates cylinder 4 misfire. What would cause that?
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Tuesday, December 30th, 2008 AT 4:10 PM
Tiny
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Ok you need to check the spark plugs and wire for those cylinders and make sure they are good. What it is telling you is that it is not firing on those cylinders. Let me know what you find. Glad you found the wire problem now lets get all 6 runnig.
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Tuesday, December 30th, 2008 AT 9:56 PM
Tiny
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I replaced the wires yesterday and I was still getting the code. I replaced the plugs this morning because 2 of them appeared to be fuel fouled. That stopped the codes but it still sounds like a lawnmower engine and it has very little power. The only other things I can think of are maybe the valves didn't get torqued as they should have or the timing chain has jumped. Am I heading in the right direction or do you have a better idea? I am frustraited beyond belief with this car.
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Wednesday, December 31st, 2008 AT 11:58 AM
Tiny
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IT'S RUNNING PERFECT! The new coil was bad and it wasn't sparking on cylinders 3 and 4. Thanks for all of your help and guidance.
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Wednesday, December 31st, 2008 AT 6:29 PM
Tiny
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Thats great its to bad it was a defective part so we didn't get into testing it anyway. Thats great glad to hear it is running agin. If there is anything else just ask. Us Mustang owners must stick together. :) Thanks again.
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Friday, January 2nd, 2009 AT 10:07 AM

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