No Power to Coil

[MGolden]

I had my car die along the road last fall. It was acting up; missing etc, for some time before that. I just figured the PIP went bad so i just got done installing a new one to get the car out this spring. The car still wont fire.

I checked the gray coil plug and i do not have any power to the coil. I checked both wires to the battery ground and nothing; this is with the key in the forward position. I have fuel pressure on my gage.


What could be the cause of no power to the coil?

thanks

Matt

 

[1TallMF]

Could be the TFI module. You can have it tested at most auto parts stores.
You can also check for injector pulsing using a noid light. If there is no injector pulsing there is still likely a problem with the PIP.
Lastly, this is probably not the case, but have a look at fuse #18 (20A) in the under-dash fuse box to see if it might have blown.

 

[HISSIN50]

I have the feeling something was lost in translation. Taking you literally:

If you are not getting key-on power to the coil, I'd start chasing it backwards - you have key-on constant power to the coil (via the EEC relay, IIRC). For diagnostics, you can run a fused jumper wire from another point in the circuit to see if the coil works properly thereafter. If it does, either run a new wire permanently or start opening harnesses to find the open in the 12 volt supply.

Good luck.

 

[MGolden]

UPDATE

I figured i would post an update to help others diagnose a similar problem.

I checked the #18 fuse and it was blown. THinking i had an easy fix, i just replaced it and saw a big spark and blew the newly installed fuse. I unplugged the TFI module and replaced the fuse and it didnt blow. I plugged it (TFI) back in and it blew again. I took the TFI module to get checked and it was fried. I installed a new unit and it fired right up!

thanks for all the help.

Matt

 

[Killercanary]

Nice to see you on here again Matt. I talk about your car all the time and your dyno graph has been posted here more times than I can count. You need to stop being a lurker! I'm glad to hear you got it fixed though as I too was drawing a blank as I had it pegged as the PIP.