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Compression on Cylinder 6


This is a discussion on Compression on Cylinder 6 within the Mechanic's Corner forums, part of the TMC TECHNICAL category!
2000 ranger xlt regular cab automatic 3.0 Engine replaced with engine from junkyard. Would get 0 on cylinder 6 for ...

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Old 02-01-2017, 02:44 PM
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Compression on Cylinder 6

2000 ranger xlt regular cab automatic 3.0

Engine replaced with engine from junkyard. Would get 0 on cylinder 6 for compression. Go drive it for awhile recheck compression get 100. Go drive it again awhile recheck get 0. Any ideas on whats causes this.
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Old 02-01-2017, 03:51 PM
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Is this with just a compression gauge or leak down gauge?
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Old 02-01-2017, 03:58 PM
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Compression tester
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Old 02-01-2017, 04:05 PM
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I'd go with sticking valve.

Can you perform a leak down test? This will confirm if it is a valve or not.
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Old 02-01-2017, 04:10 PM
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Quote:
Originally Posted by Draenor View Post
I'd go with sticking valve.

Can you perform a leak down test? This will confirm if it is a valve or not.
So how fix a sticky valve if thats what it is.
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Old 02-01-2017, 04:14 PM
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Are you loosing power?

You can try running some ATF or Marvel Mystery oil for 100 miles then do another oil change. If that doesn't work, then you may need to pull the head.
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Old 02-01-2017, 04:17 PM
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Quote:
Originally Posted by Draenor View Post
Are you loosing power?

You can try running some ATF or Marvel Mystery oil for 100 miles then do another oil change. If that doesn't work, then you may need to pull the head.
Not losing power but every once in awhile it spits n studders. But goes away after giving it gas.

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Old 02-01-2017, 07:00 PM
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I'd try the leakdown test.
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Old 02-02-2017, 01:19 AM
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Burnt valve, bent valve.

The gauge has a check valve, and it holds the highest pressure achieved. Not uncommon to hit a measly 100 psi on a warm engine with a burnt valve.

Regardless, you need to pull that head
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