Engine 4hf1 not starting

2006 ISUZU NPR

1,575,789 MILES • 4 CYL • 2WD • MANUAL

ROMAN SERAVO

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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?

Aug 22, 2019 at 7:23 PM

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KASEKENNY

AUTOMOTIVE REPAIR CONTRIBUTOR
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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Nov 4, 2021 at 6:33 PM