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Crank but no spark


Adam

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In the final leg of my 73’ restoration before paint. Just replaced the wiring harness went to start it and I’m not getting spark. The distributor is getting power and is spinning. I’ve checked all I can think of. It’s entirely possible I messed up the wiring but it seems like everything has power. 
It has an orange coil with a ceramic ballast resistor. It’s actually a 1.8 from a 320i. I can include pictures if that helps!

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7 minutes ago, Adam said:

The distributor is getting power

What kind of distributor?  Do you mean the coil is getting power?

The attached sketch might help you check your wiring, with the exception of the resistor wire instead of your external resistor.

 

2118581479_BMWIgnitionCircuit.thumb.jpg.7827d6c470dcc1942a39ad916d0f51e2.jpg

 

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Well the previous owner swappped a 320i m10 in which has a different distributor. It spins the other way and the condenser isn’t the same. Not even sure where it is, no cylinder on the outside which is about all I know

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So the coil gets power.

 

Does it get ground, through the points?

Does it blink a light when you crank it?

 

Here's where we're lost- the 320 reverse rotation

distributor has a reluctor in it that drives the electronic coil

driver/ignitor module of the 320.  So it won't work by itself

without the ignitor...

 

t

 

  • Like 1

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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On 10/30/2022 at 10:07 AM, Adam said:

Do you know how it’s wired? I’m sure I can find out online.

On the E21 its mounted on the firewall and there's normally a plug that connects to it. if the plugs not there it might be time to check out that wiring diagram.

If indeed thats what you have, hard to spoon feed you without pics😶

Edited by tech71

76 2002 Survivor

71 2002 Franzi

85 318i  Doris

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3 minutes ago, tech71 said:

On the E21 there's normally a plug that connects to it. if the plugs not there it might be time to check out that wiring diagram.

If indeed thats what you have, hard to spoon feed you without pics😶

Yes @jimk gave me the diagram

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