96xjokie

I have a 96 xj sport with the 4.0 h.o. Sometimes when idling down the road the engine dies but will start right back up. Any suggestions on my problem.

Dan4governor

I have a 96 xj sport with the same problem, weird. I'll be back to see if anyone can help us both.
Thanks for starting the thread.

Firestorm500

Maybe crank position sensor?

solderjunkie

There are a dozen things it can be... I deal with problems like this every day.

I have a four-channel data-recording scope. I connect a test lead to the crank sensor output, distributor sensor output, coil trigger, and injector pulse. When it shuts off, I hit "pause" and rewind the wave array to see what sensor-signal dropped away.

Then I isolate that sensor... for example, a crankshaft position sensor has three wires: reference, signal, and ground. I will monitor each to see if the problem is the sensor, or if it is a signal-loss issue in the harness or PCM.

If you have no way of monitoring what is actually happening, you have to wait until the part fails completely to diagnose it.