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Engine 4hf1 not starting

Tiny
ROMAN SERAVO
  • MEMBER
  • 2006 ISUZU NPR
  • 4 CYL
  • 2WD
  • MANUAL
  • 1,575,789 MILES
I've done a complete overhaul of the engine but it couldn't start.
Battery conditions perfect.
As in all other minor parts.
What could be a possible solution or have I missed something?
Thursday, August 22nd, 2019 AT 7:23 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
What we need to do to narrow this down is start with checking the basics. This means fuel pressure and compression. Due to this being a turbo diesel engine we need fuel and compression to get it running so I suspect we are missing one or the other.

https://www.2carpros.com/articles/how-to-test-engine-compression

This engine is slightly different as you are not checking fuel pressure but instead fuel vacuum. I attached this process below.

Plus, we need to check and make sure the timing is correct but this will show up in the compression check, but I attached that info as well. Please let us know what you find. Thanks
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Thursday, November 4th, 2021 AT 6:33 PM

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