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Engine runs on with Key turned off

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Engine runs on with Key turned off

Postby kasper58 » Sun Jan 12, 2020 1:03 pm

My son has a 1993 Isuzu Bighorn 3.1D that has developed an issue with the engine not stopping when the key is turned off and withdrawn.
The only way to kill it, is to remove the 15A Ign/ Eng fuse. Checked Ignition Switch with multimeter at that fuse supply side and switched key... powers on & off.
So some feed-back to supply side of Fuse?
The Alternater was replace a couple months ago with the same model and apart from that not a lot has been done to it.
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Re: Engine runs on with Key turned off

Postby stardog » Sun Jan 12, 2020 1:14 pm

I suspect it would be a stuck or crook fuel cut off solenoid on the fuel pump .
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Re: Engine runs on with Key turned off

Postby kasper58 » Sun Jan 12, 2020 1:51 pm

Fuel Cut-off Solenoid appears to be fine as Engine stops as soon as he pulls fuse.
kasper58
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Re: Engine runs on with Key turned off

Postby isuzurob » Mon Jan 13, 2020 3:52 pm

Mine is the charge relay or alternator is intermittent and if you rev it with key off it will stop
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Re: Engine runs on with Key turned off

Postby kasper58 » Mon Jan 13, 2020 5:02 pm

Just tried that, reved to 4k and bailed.
Thanks for the try.
kasper58
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Location: In the front seat, facing foward.
Age: 61
Country: New Zealand
City: Huntly
Vehicle: 1992 Isuzi Rodeo Camper


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