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This engine will crank, start and shut off after five seconds or so of running?

Tiny
VAUGH
  • MEMBER
  • 1991 ISUZU TROOPER
  • 2.6L
  • 4 CYL
  • 4WD
  • 231,000 MILES
During the brief time that the engine does run after starting all of the dash warning lights stay illuminated. When the "engine" relay is removed from the E/C fuse box, the engine will start and continue to run, but the warning lights for the O2 sensor, battery, low fuel level do not illuminate with key on. With the engine running if the "engine" relay is installed the engine will continue to run but all the dash lights illuminate.
We have replaced the relay twice.
We have tested the alternator.
We have substituted a new electrical ignition switch.
We have checked for stored codes (12) indicating no problems.
The problem was intermittent at first, no it is consistent.
We have wiggled the engine harness.
We have checked all fuses and fuse links.
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Wednesday, May 9th, 2018 AT 6:14 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,924 POSTS
When the engine stalls do you lose fuel or spark? Can you hear the pump running in the tank?

Here is a guide to help you test for spark:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Check toward the bottom of the guide. We need to know which system is failing so we can go from there. I do not think the relay has anything to do with it, but to be sure can you make a short video of the problem and upload it in your response?

Please let us know what you find.

Cheers, Ken
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Friday, May 11th, 2018 AT 11:02 AM

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