1993 lumina no spark, and clueless!!!

[Otter7450]

New ICM, New Crank Sensor, i have 12v going into ICM, also had New ICM tested and its good. Good continuity going to crank sensor, all connections are made, and still have no spark, help, out of ideals....

[jeffcoslacker]

A little more info...were these parts installed to try to fix the no-start? This is a 3.1 I guess?

Was any other work done prior to the problem?

Aside from continuity, can you see an alternating signal form the crank sensor when the motor is turning over?

You have a cam position sensor too, behind the alternator in the intake manifold. Have you checked it? It seems to my memory that they would continue running without a cam position signal, but might not start. Not 100% sure, it's been a while. Worth a check though.

[Otter7450]

About two wks ago it wouldn't start, so I replaced the crank sensor first, then had the ICM tested and that what was bad, put a new one in, it ran good for a week. Now, same thing, cranks but no start... It is a 3.1... No other work was done, the car was running good for awhile. We did have alternating signal from the crank at 1.8v ac.. I will look for the cam sensor, I didn't think it had one but I gonna check, thank a lot dude, this effing thing I'd driving me to more drinking....

[Tech II]

Have you checked for spark and fuel pressure?

Will it start if you spray carb cleaner into the intake?

[Otter7450]

Tech II, yes, no spark....

[jdl]

Did you check for ground at the ignition module? Usually the voltage and ground at the ignition module is a two wire connector. Voltage is pink, ground is black. If you take the connector loose, key on, use a test light between the terminals. If the light comes on, you have voltage and ground.

Engine cranking, do you have a fuel injector pulse, just curious? At the ignition module, the purple wire with white tracer carries rpm signal to computer, engine cranking. Without rpm signal, no injector pulse. The rpm signal is a dc pulse, if you have a dmm with a tach or anything that will react to a dc pulse, you can check that signal, engine cranking.

Did you ever check for codes, anything?

[Tech II]

This car has two crank sensors? One in the block and one behind the harmonic balancer.....did you replace the one in the block?

[jdl]

According to Mitchel, the calif vin T has two. except calif vinT, only one. Of course you never know about these databases. I have seen mistakes.

[jeffcoslacker]

Yeah I seem to remember the early DIS 3.1's having just the block mount CPK...AZ's part locator seems to think it has a cam sensor too, like I said.

[jdl]

Yeah, it depends on which vehicle the person owns. Vin T for California use shows two crank sensors and a cam sensor. The vin T outside California only shows a crank sensor and no cam sensor.

California has their own vehicle regulations. The person asking the question didn't give enough info. You guys could very well be right about the two crank sensors and cam sensor. It doesn't look like the person that asked the question is going to post up about the fix? We may never know? Have a good day.