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Old 02-15-2009, 01:15 PM   #1
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Car has no spark, But Has power through the Coil, Help?

Aright the coil has power going in and out though the 2 wires.. 14-12 volts each side when keys on... I took number 1 plug wire with plug in it and layed it against the exhaust, There is no spark when you crank the motor over.. The distributors we are using ones stock and ones a billet msd.. Neither one throws spark to the plugs.. Im trying to find a wire diagram for the distributor plug(harness) to see what wires do what going to the distributor.. I know theres fuel pump and ignition wires.. The fuel pump wire is good, Im not sure of any other wire on the plug.. Ive double checked all the grounds and everything.. Any suggestions?
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Old 02-15-2009, 02:08 PM   #2
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I found a diagram, http://www.veryuseful.com/mustang/te...1eecPinout.gif Theres 4 wires to deal with the distributor, There all supposed to have power but the one ign ground wire (black & orange). Im going to check all of them. Im just curious if the coils giving the cap n rotor button power, how comes its not going to the cylinders? Or dose it go through the distributor before it gos to each plug?

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Old 02-15-2009, 08:09 PM   #3
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could be the module in the dizzy. I had the same problem with my car and the little module went bad. it also could be that you have a bad coil wire. cant imagine the wires for the distributor are bad unless you did a 5.0 swap on the car or something. thats all the help I can give. If you have power to the coil, 90% of the time you arent getting spark because of something in the distributor
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Old 02-15-2009, 09:21 PM   #4
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Quote:
Originally Posted by bigEasy08 View Post
could be the module in the dizzy. I had the same problem with my car and the little module went bad. it also could be that you have a bad coil wire. cant imagine the wires for the distributor are bad unless you did a 5.0 swap on the car or something. thats all the help I can give. If you have power to the coil, 90% of the time you arent getting spark because of something in the distributor
Yeah, mine failed too. Something about heat and those TFI modules on the distributor. It would start up drive it around for a little bit. Shut it off and then go back and try to start it up and all it did was turn over.
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Old 02-15-2009, 10:24 PM   #5
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module X's 3
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Old 02-15-2009, 10:33 PM   #6
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check the wires near and to the starter relay. one time i had to take off some power wires that i had connected to the starter relay, and by mistake left a wire off when i reconnected everything. i had power and everything to the coil and no spark
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Old 02-15-2009, 10:46 PM   #7
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well i dont think its module becuase I put 2 different distributors on. Both i know were good before the motor swap. Well I should be able to use the test light on all the wires on the tfi plug and make sure there all getting power and the one ground is grounding.. If not should be able to jump them with hot wire just to see if thats the problem right? Ill double check the solenoid i did have that off a few times messing around..
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Old 02-15-2009, 11:16 PM   #8
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Roll it over with a test light on the - side of coil to see if you are getting a pulse.
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Old 02-15-2009, 11:26 PM   #9
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can you see spark coming out of the plug?
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Old 02-16-2009, 12:44 PM   #10
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no theres no spark coming out of the plug.. Im going out here in a min to mess with it , Ill try a few things.. I tryed two different coils and distributors... Has to be a wire somewere either cut or a ground not bolted up.. ill double check it all again
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Old 02-16-2009, 01:19 PM   #11
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If the neg side of the coil is grounded you'll get no spark. Neg side goes to the tach. And yes someone I know added 12v wire to the + side and run a ground to the neg side. lmao after I fixed it.
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Old 02-16-2009, 02:36 PM   #12
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Ok so is both sides suposed to have 12v's going though them? I thought one side was supposed to be grounded? if so somthings wrong i got power on both wires?

( If the neg side of the coil is grounded you'll get no spark. Neg side goes to the tach. And yes someone I know added 12v wire to the + side and run a ground to the neg side. lmao after I fixed it. )
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Old 02-16-2009, 02:52 PM   #13
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I almost want to say the coils bad but the coil we put back on was working when it came of? If both sides are getting power and the coils grounded, Then there should be spark right?.. Only other thing i seen was when the key is on both sides have 12v's but when i crank the key neither one pulses?
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Old 02-16-2009, 03:03 PM   #14
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I also say TFI module,you can take it off the dizzy and have it tested for free at Autozone.
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Old 02-16-2009, 03:08 PM   #15
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I'm kinda confused here...is there anything coming out the coil? I saw someone suggested a timing light on the coil wire to the distributor. Great idea...have you tried that?
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Old 02-16-2009, 03:14 PM   #16
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Hey guys thanks for all the help I fixed it.. I redone all the wiring to the coil and cleaned the tfi and made sure everything was perfect, and it fired right up...
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Old 02-16-2009, 03:15 PM   #17
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ya I think the whole problem was the tfi, had moisture on it and was dirty... Plus the wires from the autometer tach looked old so I re did all that and messed with the tfi.. I learned a little bit here, Thanks guys..
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Old 02-16-2009, 05:31 PM   #18
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Sounds good!
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Old 10-18-2014, 05:36 PM   #19
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Power @ coil...NO spark...test light does NOT flicker...goes slightly dim...
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Old 10-21-2014, 05:53 PM   #20
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How to Solve an EFI No Start

i had spark at the plugs, but dim. Rotated the dizzy as explained in the above link, and my test light flickered at the coil. Replaced the coil, fired right up.
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