My TJ is pre-canbus so I wouldn't get a no bus message, but I had a similar thing happen in Feb.
In short, the ASD relay was sticking. Longer version below...
After rebuilding my engine I drove home from work, and upon arrival the engine kept running with the key removed. Knowing it won't run without fuel and spark I thought a relay was sticking. Even if the fuel pump relay was staying on, I figured loss of spark from the ASD relay switching off would have stopped the engine. With that in mind I went to lift the hood but as soon as I did the engine stopped.
Swapped relays about with the horn relay and all tested ok. All relays were put back in original positions and multiple start stops were fine.
The very next day The engine continued running again. This time I got to pull the ASD relay and it stopped the engine immediately. I swapped it with the horn relay, figuring I could live with the horn sounding continously if necessary. As soon as I had a new relay, I broke open my old ASD relay and the contacts looked black and had obviously been sticking.
Last edited by Jonny Jeep; 13-12-2019 at 06:18 PM.
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