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Old 02-15-2012, 08:17 PM   #1
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no spark or injector pulse

Ok so here's the deal. I have no injector pulse. I checked with noyd light. Also pulled a plug and no fuel on it however I do have fuel pressure. I have power to computer and I also changed my computer. My ground also is good. I changed the pip (pick up coil) had the ignition control module checked @2 different places and both said it was good. I changed the coil which I do give 12v going into it and changed the coil wire to distributer. Also changed the rotor. Im put of ideas and if anyone has a clue please help im so lost. Oh and its an 87 mustang with a 5.0. Still speed density
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Old 02-15-2012, 10:08 PM   #2
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Re: no spark or injector pulse

Do you have a Chilton's or Haynes manual with the complete wiring diagrams?

If you do start tracing the systems and check for voltage at all of the proper places leading to the ignition and fuel controls.
After the 12 volt power enters the computer figure out where it goes to and when the other relays and controls should be activated, then make sure they are.
When you find the one component that is not sending the power through as it should, there is your problem.


Or you can start on the other end and trace the wires back through the systems components and to the computer.
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Old 02-15-2012, 10:21 PM   #3
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I know he changed it but it still seems like the pip.could he remove the spout connector and see if it will start? I read something that stated sometimes when the pip is not working the engine may start but not run great with the spout connector removed.

---------- Post added at 10:21 PM ---------- Previous post was at 10:20 PM ----------

I would also start with any wiring related to the pip since it control tfi and efi.
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Old 02-15-2012, 10:35 PM   #4
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Re: no spark or injector pulse

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Originally Posted by dreamstang View Post
I know he changed it but it still seems like the pip.could he remove the spout connector and see if it will start? I read something that stated sometimes when the pip is not working the engine may start but not run great with the spout connector removed.

---------- Post added at 10:21 PM ---------- Previous post was at 10:20 PM ----------

I would also start with any wiring related to the pip since it control tfi and efi.
Maybe, I don't know for sure.
I do know you can test most of the components involved including the PIP.
I can't remember the exact procedure, but you connect it to a multi-meter somehow and watch for the way the meter interprets the signal.
It should scale up and down smoothly as you have someone try to start the engine.
If it jumps or falters then the PIP is faulty.
I think the exact procedure is in the Chilton's book.


It's weird that fuel and ignition both are involved. There is probably a relay somewhere in the system that has failed. If it was a 94-95 model I'd say the CCRM has failed, but the older models don't have that.
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Old 02-15-2012, 10:39 PM   #5
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he said he changed the pip.but ive gotten bad parts before and or any wiring involved could cause it to not work also.like you said time to bust out the multimeter and schematics.
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Old 02-16-2012, 03:49 AM   #6
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Re: no spark or injector pulse

Yea I feel like its a relay going to the computer as well. There is a black box on pass side that has two connectors going to it and has a circuit board inside. What is this and there's a brown box in driver side. Says motorcraft on it. What is this as well? Also a black thing that sets behind the intake. It has a vacuum hose and some wires going into it. I've looked on line and can't figure these out. Any help would be appreciated. Thanks guys for ur concerns. It means alot. I've racked my brain and emptied my wallet trying to fix this.
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Old 02-16-2012, 12:56 PM   #7
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Re: no spark or injector pulse

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Originally Posted by Giles85 View Post
Yea I feel like its a relay going to the computer as well. There is a black box on pass side that has two connectors going to it and has a circuit board inside. What is this and there's a brown box in driver side. Says motorcraft on it. What is this as well? Also a black thing that sets behind the intake. It has a vacuum hose and some wires going into it. I've looked on line and can't figure these out. Any help would be appreciated. Thanks guys for ur concerns. It means alot. I've racked my brain and emptied my wallet trying to fix this.
It's hard to say what those are for sure.Not being able to physically see them or explore their connections puts us at somewhat of a disadvantage to say the least.
Get your manuals out and start tracing wires and hoses until you locate them in the drawings is about the best we can tell you without being able to actually look at the car.
Maybe find the Ford numbers on them and Google search those numbers. Sometimes that will turn up some info. Look at both the text results and image results.
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Old 02-17-2012, 06:52 PM   #8
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Re: no spark or injector pulse

Holy crap I just figured out what the problem was. I mentioned that I was putting a heater blower in in my other post. Well I knocked off the computer relay off and it fell behind the carpet. Wow so received to figure it out. Thanks for all ur help
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Old 02-17-2012, 07:08 PM   #9
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Re: no spark or injector pulse

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Holy crap I just figured out what the problem was. I mentioned that I was putting a heater blower in in my other post. Well I knocked off the computer relay off and it fell behind the carpet. Wow so received to figure it out. Thanks for all ur help
Glad you found it.
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Old 02-17-2012, 07:08 PM   #10
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Awsome! That is great news.
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Old 02-19-2012, 05:36 PM   #11
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Re: no spark or injector pulse

Ok so I get an initial spark but after that nothing. Injectors work but why do I only get that first spark when I turn key on. Any ideas
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