79 XJ6 VP no start issue. Please help
Junior Member
Joined: Mar 2014
Posts: 3
Likes: 1
From: Saskatchewan
I respectfully disagree with Jay on the coolant temp sensor. 
The engine won't run (or shouldn't) run with it disconnected, and a running engine will die instantly if you unplug it. Some say a disconnected sensor stops injector pulse; others say it fattens the fueling so much that the engine dies. I'm in the former camp, not the latter.
Anyhow.....
Pull the connector and jump the terminals inside with a paper clip. This tricks the ECU into thinking the engine is fully warmed up and commands the injectors accordingly. If the engine now starts then you're on the right track.
Naturally you'll check the condition of the terminals while you're there.
Cheers
DD
The engine won't run (or shouldn't) run with it disconnected, and a running engine will die instantly if you unplug it. Some say a disconnected sensor stops injector pulse; others say it fattens the fueling so much that the engine dies. I'm in the former camp, not the latter.
Anyhow.....
Pull the connector and jump the terminals inside with a paper clip. This tricks the ECU into thinking the engine is fully warmed up and commands the injectors accordingly. If the engine now starts then you're on the right track.
Naturally you'll check the condition of the terminals while you're there.
Cheers
DD
Veteran Member
Joined: Mar 2008
Posts: 25,529
Likes: 11,721
From: Pacific Northwest USA
Hmmm. I think you have your hands on the wrong temp sensor.
On your V12 it's the two wire sensor just aft of the LH thermostat.
Cheers
DD
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