'82 spider L-jetronic ignition problem

[mtripoli]

Hi all, I'm new here. I wish I'd known about this when I did the bulk of the work on my car, lots of great information.

The car: '82 Spider with L-jetronic ignition.

I rebuilt the engine a while back and the car drove great. I stored it for a while awaiting further work and got it up and running again about 6 weeks ago. It hesitated to start after sitting for a while, but with a little starting fluid it fired right up and ran like a champ. Then it sat for a couple weeks and now it won't start up, no spark period. there's new plugs, wires, cap, rotor and coil, so it seems to be narrowed down to the magnetic flywheel sensor, of which there are 2, one for the tach and one for the ignition.

so my questions:

1) is my reasoning sound? what else could it be other than the computer?

2) is there a way to test whether the sensors are working when off the car?

3) I could just swap the sensors and sacrifice the tach for now, right?

Any other ideas? The car was running like a top the last time I started it, now no spark at all.

[ghnl]

Have a peek at the L-jetronic Spider diagnosis page. Link is in my signature.

Check for adequate battery voltage during cranking. It must show over ~ 10.3 volts otherwise the computer never wakes up to send out the spark & fuel signals. If it reads low charge or replace the battery (after making sure all battery cable connections & grounds are clean & tight).

You can check the flywheel sensors in the car or out. Info is in the L-jet page. Those sensors are for the computer (one for timing, the other for rpm's). The tach gets it input from a white wire attached to the coil. Not from the flywheel sensor.

[Tifosi]

Quote:

Originally Posted by mtripoli so it seems to be narrowed down to the magnetic flywheel sensor, of which there are 2, one for the tach and one for the ignition