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

[ST1G]

Any at the yards?

I snagged one from the yard I'm going to try. But if it doesn't work I don't fully trust it.

[ThatOneEuroE30]

Yep. I'm getting 12v at the coil. I am to the point that I think I might just spring for a new CPS. It could be my problem for sure.

Any at the yards?

[ST1G]

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?

Yep. I'm getting 12v at the coil. I am to the point that I think I might just spring for a new CPS. It could be my problem for sure.

[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?

[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?

[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.

[ThatOneEuroE30]

Got that crank sensor?

[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.

[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 :)

[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]

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]

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]

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

[///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]

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.