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Old 04-06-2015, 04:52 PM   #3
enaberif
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Join Date: Jan 2009
Location: Calgary, AB
Posts: 1,181
Re: Low Vacuum? With good compression?

Quote:
Originally Posted by Wrenchbender Ret View Post
It could be a worn timing chain. You can get an idea by moving the balancer back & forth to see how much movement till it tries to move the cam. About 5 degrees is not bad. 10 or more is too much. How many miles are on it. If it is over 100K it could very well be bad. Those had plastic cam sprockets that wear out easily & the chain can jump a tooth.
From my recent rebuild. No clue on mileage of truck

http://i.imgur.com/qF8Guro.jpg
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