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Old 03-24-2019, 03:19 PM
jonmcfatty jonmcfatty is offline
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Default 0 Compression on all six 4.0 sohc 4wd m/t

Can anyone tell me why I am getting 0 compression on a motor that was rebuilt in August and was running great, then started idling rough. When I tried to start it it would not start. Confirmed fuel and spark but still would not fire after putting starter fluid in the manifold? Now I am getting 0 on my compression test. What's up?
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Old 03-24-2019, 04:12 PM
Dirtman Dirtman is offline
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Default Re: 0 Compression on all six 4.0 sohc 4wd m/t

Your compression guage is broken... Loosing all compression on all cylinders would only happen under an absolute catastrophic failure, or the starter is not actually turning the engine over.
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Old 03-24-2019, 06:44 PM
crowdpleazer crowdpleazer is offline
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Default Re: 0 Compression on all six 4.0 sohc 4wd m/t

Definitely the gauge. I've seen engines with gouges in the cylinder walls, broken rings, and a broken timing belt still have about 20 psi compression (that is still not enough to run btw).
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