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Tom, ASE Certified Technician
Category: Car
Satisfied Customers: 25954
Experience:  ASE Certified Master Technician
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Isuzu NPR: 1991 Isuzu NPR will not turn off. 4cycl diesel engine

Customer Question

1991 Isuzu NPR will not turn off. 4cycl diesel engine and automatic transmission. Any ideas?
Submitted: 4 years ago.
Category: Car
Expert:  Tom replied 4 years ago.
So the vehicle will not stop running correct?
Customer: replied 4 years ago.

That is correct

Expert:  Tom replied 4 years ago.
Will the vehicle turn off if you disconnect the battery?
Customer: replied 4 years ago.

Not sure on that cause I didnt have time to get tools either time. I went to the repair shop to get tires and had to choke it out. Then when I brought it home the same thing.


Both batteries are bad and had to jump them off in order to start it. Is it a possibility that the fuel solenoid bad or not communicating since the batteries are bad?


I just dont want to spend a lot of money if there a deeper issue then the fuel solenoid or batteries being bad.

Expert:  Tom replied 4 years ago.
Has the ignition switch been checked?
Customer: replied 4 years ago.

The ignition switch harness has just been replace. The actual switch has not been checked. But I dont think it has an actual switch like a car does. The key cylinder has a notch that goes into the harness itself and turns.

Expert:  Tom replied 4 years ago.
Yes if this is shorted out it will cause this. I would have this checked next to rule it out.