NO SPARK!!! HELP

[sergk]

Ok so I had to pull my engine to replace the bell housing, and changed upper oil pan. I got this m35x from an auction. The front driveline came loose and took some things with it. It started and ran fine before the engine got pulled. I have got everything hooked up, and now its cranking but not starting, I got no spark!!! I changed the crank position sensor also. What else could be causing no spark??

[MY06M45S]

Are all your grounds hooked up?

[sergk]

yeah i checked that, supposedly all hooked up

[DeanM45]

Check to see if the coils have voltage (they are negative trigger). If no voltage, check fuses. If fuses are good then probably a bad ECU.

[sergk]

I did check the coil packs and they had voltage and fuses were good...
I was reading in the service manual about wheel sensors have something to do with ignition, my wheels/control arms/axles not connected so I will try to connect all that and give it a shot tomorrow. Hopefully she fires right up

[DeanM45]

OK, I didn't realize that you did not have everything hooked up. Yep, the speed sensors regulate the traction control which regulates the ignition (this is not the RPM limiter which primarily cuts fuel). Even without everything mounted if you just plug the sensors in it should fire up.

[sergk]

So I got the wheel sensors plugged in and still same thing, If I had my PCM disconnected for engine removal, would I have to reprogram it to run the car? its the same one..

[DeanM45]

Are the injectors firing? (get someone to push the start button while you have your finger on one of the injectors to see if you feel a "click").

Also, get a scanner or if you have one check for DTC codes - it may not be receiving crank and/or cam signals which it needs to fire.

[sergk]

I don't think I can stick my fingers that far under the plenum lol.
And I did hook up the scanner and Im getting no codes.

[DeanM45]

Stick a hose in and get near or touch the injector. You will hear a very noticeable click if it is opening.
On the scanner, when cranking, what rpm value does it show? If it is zero then it is not receiving cam/crank signals.

[svard75]

For no spark ensure the following are connected and functioning

Crankshaft position sensor (POS) Input Signal to ECM Engine speed.
Piston position Camshaft position sensor (PHASE)
Mass air flow sensor
Engine coolant temperature sensor
Throttle position sensor
Accelerator pedal position sensor
Battery (obviously is)
Knock sensor
Park/neutral position (PNP) switch
Wheel sensor

[sergk]

I've been through that list of sensors already... one thing that is strange is as soon as my ignition is turned to the on position, the radiator fans turn on also. Not sure if that helps or not

[EdBwoy]

Not familiar with the radiator fan setup on the M35s, if is connected by a belt and is not driven by the crankshaft, then you might have wired the coolant sensors wrong such that the car thinks you're overheated. I've seen cars refuse to start when overheating.

My other guess would be your signal plate. Remove the crankshaft position sensor(the one between the oil pan and bellhousing) and make sure you can see your signal plate. You said you replaced the bellhousing and changed the upper oil pan. I'm guessing you had to remove the flywheel & signal plate while at it. Hopefully you did use your old one and not the flywheel from your donor car.

[sergk]

Ok we got some progress, unhooked the crank position sensor and she turned a bit but fired up.. So got another sensor from a doner car and hooked it up and no spark again, I got 2 doner cars, so got the other one and it fires up and immediately dies. But now i'm getting a code for crank position sensor, so I went to O'reilly and picked up a new one and she ran like new. Second time starting, its kinda rough and a few seconds longer dies, but I think the battery might be getting weak from all the cranking before

[EdBwoy]

Some progress, that's good to hear. If you've got all M35s as donors, you should be in good shape. A good battery will be your friend when starting up projects.

[sergk]

so I didnt have a chance to be around the car lately, but I figured out what was wrong, the signal plate got bent when engine was being put in I assume, because it works fine with some pressure on the crank sensor. When letting go it sputters and dies.
I will be removing the transmission and putting a new flywheel on from the other engine tomorrow. When everything is complete I will update

[EdBwoy]

Thanks for reporting back with your progress sergk.

Not trying to be funny here, but did you use the same size bell housing? You're not using a washer between the sensor and bellhousing, right? What you described sounds like the sensor is slightly pushed/ angled out.
Before going all out on the replacement, I'd first have somebody turn the crankshaft 2 or so turns while I got under there with a flashlight to see if the signal plate was really bent. Again, it is really hard for the signal-dependent systems to run with a bent plate (even if you pushed the sensor in) - and if they will run, you will most probably get a check engine light... Although you mentioned a code for crank already, so that might be it

[sergk]

I pulled the transmission and swapped the flywheel/signal plate, it was slightly bent, new one is in and running like new!!! when I was put the engine in the first time, I would barely turn by hand, something didn't seat right I'm guessing or something, but I checked everything from new sensors to wiring, this was the last thing left I could think of

[EdBwoy]

Glad that worked out for you, and again thanks for reporting your progress. Enjoy your M