We have been working on a 97 F150 for the past 3 days and we still can't get it to run. The story is the car ran.. then blew a head gasket.. then after awhile it didn't want to start. We replace the head gaskets along with getting the head redone. Installed everything back together and now it doesnt want to fire up. We installed a new crank sensor and even tried new coils and nothing. There is power going to the coils and also he crank sensor but it wont fire up.

There is no spark to the plugs and the injector isnt blinking. We even tried another EMU and nothing. I have been going thru most of he f150 forums trying to figure out whats going on and every other thread its either the crank sensor or the coils. I was wondering if anyone have a clue what this might could be? The owners of the car must have drive it with a blown head and one day they tried to start it... it did not want to start.

 

checked your grounds? timed correctly?

 

Fuses? More specifically #30 under the dash. The injector isnt blinking...not familiar with that one. Any fuel pressure? PCM fuse under hood maybe. I shorted an O2 sensor and blew the main once that was fun. What year is this vehicle and is it COP or pack? I cant imagine power to the coils and not the plugs thats a bit strange. I assume it is cranking at least? A few more technical details would be nice.

 

Sorry you said '97 so its coil packs. I would pull a plug boot and crank it and see if it arcs to something then you'll know about the power issue. My money is on a timing issue.

 

Also, check the inertia switch.

Your sure you have the timing correct?

 

I have seen several times after a modular reassembly that the HDR wheel was reinstalled backwards. its the large gearlike wheel with the teeth around it's perimeter that goes on the crankshaft for the cranksensor. There is only one way it can go on and have the engine fireup. You will get no signal for the ECM/PCM to fire.

 

I check the inertia switch.. its fine.

Power is going to the coil packs... from the coil packs its not producing any sparks..

Its getting Fuel so its ok.

we went and got another ecu and nothing.

tried a new crank sensor and nothing.....

cam sensor is ok.

The gear teeth that goes in one way is fine.. the timing is all on the marks.

The truck is just not producing sparks to the spark plug boots. We pulled the spark plug boot off and stuck a long flathead into the tube and cranked the motor. No spark the powers wire that goes to the crank sensor has power coming from it.

So the story of the car.. its a customers of ours car and what they told is that they drove the car with the check engine light on while sometime and ignored it.. so then im guessing one day they drove it... and the next day they tried to start it and the car didnt want to start. So idk if they knew they was driving it with a blown head gasket... and just continued to drive it like that until the car didnt want to start. We have been working on it for the past week and we checked out everything.

 

Look in the crank sensor hole and look at the HDR wheel inside that sits on the crank. If the teeth are centered in the hole then its on right if the teeth are sitting back toward the back part of the sensor hole then the wheel is on backwards and the sensor magnetic pickup will not pickup a signal. Sounds like thats the problem to me.

 

^^ You are correct. Here is a little update. After fighting the truck for 2 week testing and double checking everything out.. we decided to take apart the timing to double check everything out. After puling timing cover off we here a CLANK! Looked down to the floor and we saw that the timing crank gear was split into 2. After all of this time of not getting spark it turns out that th crank gear had split somehow. Now we are in the process of inspecting the car and waiting for the new crank gear. Hopefully this is it lol

ill keep you guys posted i just thought id update you guys.