Main distributor

[964968]

My 964 will not run on the main coil/ignitor plug. I can plug the main in either ignitor with the secondary unplugged and it won't start. I can disconect the main ignitor and plug the secondary in either ignitor and car will run.
Distributor belt is not broken and I sent the ecu out to be checked and it came back 100%.

Thanks David

[Nine9six]

Originally Posted by 964968

If I disconnect the plug to my secondary coil ignitor my 964 will not start. I can plug it into main or secondary ignitor and car will start.
If I disconnect the secondary and plug in the main to either ignitor car will not start can anyone help diagnose my problem?

The initial issue/problem seems to be adequately describing the problem...Punctuation would definitely help; as the whole thing seems so convoluted.

The first two sentences seem to contradict themselves.

I strongly suspect the problem statement needs to be reworded so that it makes sense.

Perhaps if you try providing the correct nomenclature to the word, "it" throughout your problem statement, things may make better sense?

[DCinVA]

I looked at this question yesterday and was totally confused.
Agreed that it needs to be reworded so that it makes sense.

[964968]

Sorry for the mass confusion. My 964 conv with tiptronic will not start if I disconnect the plug from the secondary coil module/ignitor.

[964968]

Originally Posted by DCinVA

I looked at this question yesterday and was totally confused.
Agreed that it needs to be reworded so that it makes sense.

My 964 conv w/tiptronic will not start if I unplug my secondary coil module/ignitor.
Sorry for the mass confusion

[DCinVA]

Thanks for the better explanation!
Clearly an issue in the primary circuit somewhere. I would start by examining the plug at the ignitor. I have seen cases where the wire connector was not firmly seated in the plastic housing for the plug, and therefor not making a good electrical connection. The wire connectors snap and lock into the plug housing. Typically you can push the connector back into the housing and snap it back into place. If that is not it start tracing it back using the wiring diagram. Check the plug at the ECU, DME and related components as well.
Good luck

[wesleyc]

I'm still confused ? Read original post yesterday morning. Once out loud. Needless to say it took a extra cup of coffee to unwrap my head from this quiz.

[bazar01]

If the secondary ICU (ignition control unit) and coil work, then the problem is in the main ICU and coil circuit.
The firing signal only comes from one pin on the DME to both the main and secondary ICU. So it cannot be a missing firing signal.

It could be a bad main plug/wiring or a bad main ICU. Swap the main and secondary coils too to confirm.

[Nine9six]

Originally Posted by wesleyc

I'm still confused ? Read original post yesterday morning. Once out loud. Needless to say it took a extra cup of coffee to unwrap my head from this quiz.

Thank God!...Thought I was having negative effects from the 70's.

[964968]

Thank you BAZAR01
That's exactly what I was asking all day. I tried secondary plug on both Main and secondary and car will start on both.
So I will trace the wiring down.
Again thank you so much and I will keep you informed
David

[964968]

Originally Posted by bazar01

If the secondary ICU (ignition control unit) and coil work, then the problem is in the main ICU and coil circuit.
The firing signal only comes from one pin on the DME to both the main and secondary ICU. So it cannot be a missing firing signal.

It could be a bad main plug/wiring or a bad main ICU. Swap the main and secondary coils too to confirm.

I check both plugs with my ohm meter they are both reading the identical same when I turn the key on.
So needless to say I am baffled as to how the secondary plug will start the car from either ICU yet it won't start at all wiith the main plug.

I don't know if this is all related but once it warmup the car will continue to run but the tach will go down to 0 while idling.
Any ideas?