94 Lumina 3.1 cranks - won't start

[Tinman238]

Originally Posted by Rub_Dr

Hey your reply set off a lightbulb. Sounds similar to what mine did b4 it just gave up. After 2 yrs of tinkering on it in my spare time it ended up being the wiring was shorted from the crank sensor to the control module. A cheap way to check that, go find one in a junk yard that still has both connectors and make a new 1 you can loop under the car and plug in. Most of the junk yards will just give you the connectors or at least they do here where im at.

At least mine is running OK for now.. just need to clean the rats nest out of the duct work so i have heat again

I'm beginning to suspect wiring more and more. I will definitley check the wiring out. Thanks.

[luv my lumina]

similar problems here...replaced plugs and all things ya'll listed...ended up being busted timing chain.....maybe worth checking out eh?

[Bearwulf]

Originally Posted by Blue Bowtie

A '12' is the code for no ignition reference pulse. It doesn't mean that the system is in diagnostic mode, as most web sites erroneously report.

Then maybe you should inform GM about this as they state in their manuals as well as @ the shops that this is the indication of whether or not the ALDL is working.

[Manowarr]

This happened to my 92 lumina 3.1L V6. It would crank over but wouldn't start. They replaced a couple of coil packs and the crank sensor and it started fine after that.

[Tinman238]

Thanks for the input. Verified the timing chain is fine, checked ignition module, coils, new plugs and wires, new intake manifold gaskets, fuel injectors verified OK, new ECM, O2 sensor, crank sensor, fuel filter, etc. Seems to be that the ignition circuit is not getting consistent power. I'm thinking now that it could be something in the ignition switch or wires in the steering column. I bought a Tahoe cause I needed something that ran. Hopefully I'll work on the Lumina again in a week or so.