Car cranking, but not starting(Now with spark!)

[ST1G]

Get that new crank sensor in and then go from there

Yeah... I stop by the parts store. $80 I'm going to see if I can snag some from the yard that test okay.

[ThatOneEuroE30]

Yea. When I thought it was mine for the m30 I priced mine at around 100 or something. To much to pay for something that may not be the problem

[ST1G]

Well, twist of events. I realized today at the yard I tested the harness on my car, not the sensor. So I grabbed a good sensor at the yard and come home and retested the resistance of the CPS and it tests within limits... So I don't think that's the problem.


So, no I have no clue what the problem is. I guess I'll try a new distributor for giggles :(

[ST1G]

Talk about frustrating. I'm really just unsure where to go from here. I pulled and visually inspected the CPS. It was covered in oil and debris. I cleaned it and reinstalled, it's testing even closer to spec for resistance.

After reinstall I'm still not getting any spark

Here is the dirty sensor.



Updated: hooked a spark plug directly into the coil via the coil sender wire. Grounded plug with jumper cables and go no spark. Moved the same spark plug and wire to my running e30 and got spark for days. Moved the working coil over, and still had no spark. So I think it's safe to say that my issue is up stream of the coil.

[///M42 sport]

hmm I had a similar issue...turned out to be the main relay. You mentioned the no fuel issue...look anymore into that? Fuel pump?

[ST1G]

hmm I had a similar issue...turned out to be the main relay

I have jumped the main relay and that didn't solve the problem.

Tomorrow I'm going to try a known 173 ecu

[HennaE30]

I have jumped the main relay and that didn't solve the problem.

Tomorrow I'm going to try a known 173 ecu

If the ECU doesn't fix it, I would start checking grounds for everything, even just a loose bolt will cause some of the dumbest things like this.

[ST1G]

If the ECU doesn't fix it, I would start checking grounds for everything, even just a loose bolt will cause some of the dumbest things like this.

If ecu doesn't do it, I think I'm going to verify the harness between the ecu and the engine bay has continuity.

At that point I'll start checking grounds.

[HennaE30]

If ecu doesn't do it, I think I'm going to verify the harness between the ecu and the engine bay has continuity.

At that point I'll start checking grounds.

Ah yes, forgot that step. Good luck! Hopefully it's something simple and easy on the pocket book, let us know how it goes.

[ST1G]

Ah yes, forgot that step. Good luck! Hopefully it's something simple and easy on the pocket book, let us know how it goes.

If it gets too expensive I might have to just go 24v :)

[ST1G]

Update: Tried a working 173 ecu, no spark. My 173 ecu in the other car, works perfectly.

Soooo we can rule out the ECU.

[ThatOneEuroE30]

Got that crank sensor?

[DiM]

I'm having this same issue. Cranks but no start. Replaced fuel pump/filter, cap/rotor, spark plugs/plug wires, crank sensor, coil, fpr and she still doesn't turn over.

[ST1G]

I'm having this same issue. Cranks but no start. Replaced fuel pump/filter, cap/rotor, spark plugs/plug wires, crank sensor, coil, fpr and she still doesn't turn over.

Do you have spark?

[Skoobeesnak]

My old CPS was testing as good but the new replacement I got was bad. I would get an OEM CPS or take a known good one and try it. I went through something very similar a month or two ago. Are you getting voltage at the coil?