Car quit two days ago and no tach pulsing when engine cranks (no sign of wanting to start). Put in new RPM sensor and still no tach pulsing. Is this a bad sign, i.e. computer?

I have spare power stage, fuel pump relay, and radio suppression relay that I use for testing and replacing them made no difference. After supper I'll check for spark and fuel, but in the meanwhile, thought might get a quick answer on first place to look with no tach pulses with good RPM sensor.

Thanks,

Gary

Looking at '93 green book diagrams, I see that the pulse comes right off Power Stage terminal 1, then splits to coil terminal 1 (for spark) and panel terminal 5A-6 for the tach. I can give you point-to-point if needed.

It's basically the same for REX.

So the RPM sender is NOT directly tied to the tach.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

Bruce,

Thanks for the good information. I took out #2 plug to see if I had spark when grounded and the sucker started. Put the plug back in and letting the car warm up to see if it stops when hot. Maybe just need to get some fuel after replacing RPM sensor.

Thanks for kindly taking to time to look up the info for me.

Regards,

Gary