92 RS 305

Moved the car the other day and now if won't start. It will start for a few seconds if I spray carb cleaner though and then stall.

Things I've checked so far,

ICM was tested at parts store.
Fuel Pressure 10psi
Fuel Relay ok
Inline fuse near battery ok
I can hear pump priming
Dash fuses are all good
No security lights

No spraying injectors...

This is a real pain in the ***...what else is there to check besides injectors? not sure of the pickup coil can cause this.
I hope no one dumped crap into my tank.

 

If the injectors aren't spraying than it is likely your pickup coil. Crank your engine and I bet your tach stays still, it should be bouncing.

 

Do you mean the external ignition coil?

 

No I mean the pickup coil inside the distributor. In order for the injectors to pulse the ECM needs to have a RPM signal.

You have spark since it fires when you spray carb cleaner in it.

 

Probably not the pickup coil; the spark is generated from that too. Therefore if it was not working, there'd also be no spark.

Try pouring a gallon of gas in the tank.

 

I did that today just to remove any doubt. I checked the injectors today and was able to verify there is no pulse to the injectors.

My RPM guage does work when I start the engine with carb cleaner.

Right now, I am thinking my ECM is toast.

Have I missed anything?

P.S going to have the ICM checked at NAPA this time just to remove any doubt. The dude at Advance seemed inexperienced. Will update until problem solved.

 

I've had no injector pulse, but still had spark before...I replaced the icm with no change, it was the pickup coil. The only things that will stop the injectors from pulsing would be no tach signal to the ecm, VATS which would also cause a no crank symptom unless the starter relay was bypassed at some point, a bad ECM, or no fuel, but even then the injectors may pulse?

does your rpm gauge work when you are just cranking without using carb cleaner?

also since your supplementary information is not filled out I have been assuming this is a tbi car, is this correct?

 

I checked ICM again today and it's good. I'm going to yank out the dizzy later today and check it out with a meter.

 

Quick update. Pulled the distributer out to inspect it and the manual calls for 500-1500 resistance on the pickup coil terminal.

I got an infinite reading. So, I think problem solved.

 

Alright. After having replaced the entire distributer because of the pickup coil, I continued to have no spraying injectors. The problem turned out to be a bad ECM. As soon as I swapped ECMS the car fired right up. (I wish there were a test for this). The computer still flashed and had it's self diagnostic tests working. The only reason why I swapped ECMs is because the same thing happen to me on a 84 camaro decades ago. In total, the repair set me back 150 bucks. So yes, a bad ecm will also cause no spraying injectors.

I Hope this helps someone else down the road.

 

Yes a bad ECM will cause a no pulse symptom...You said that your tach worked when you cranked while adding carb cleaner, but never answered my question if it bounced while cranking or just stayed stationary....

 

It would bounce only if I sprayed in fuel.

Thanks for all your help.