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Ether is not to be used on the 6.2L. Diesel. It will work fine on other Diesel designs, like the M939 series 8.3L. It can and will cause internal damage as already mentioned. The Military and General Motors state very explicitly, in literature and decals on engine air cleaner, etc. not to use...

Ether is not fine. There’s a reason that the Military, GM and the 6.2L design says not to do it. If you want to use it on your stuff....ok. But to say it’s fine to use when it’s clearly not and has been proven so isn’t good advice.

Yes it could be glow plugs and it could also be something else or a combination of things. The CUCV TMs have a troubleshooting guide to help solve issues, including it not starting. A search of the old threads will help as the issue has been discussed many times. DO NOT spray ether unless...