Question about 1986 Chevrolet Chevy

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Motor doesnt build up vacuum pressure when running could it be the heads?

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You should have 21" of vacuum pressure, check for valve adjustment, also check ignition timing.Also check for a clog exhaust system.

Posted on Aug 03, 2010

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It could be the valves,and they may just need adjusting.

Posted on Aug 03, 2010

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Check the vacuum hoses first, if you haven't done that. That is usually the problem. Vacuum originates from hoses leading from the intake manifold

Posted on Aug 03, 2010

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check the PCV valve, If its plugged you'll get the same results, most back pressure in motors of any type is oil pump, defective check valve in the filter section , try this, remove the PVC valve and the oil cap at the same time and block the vacuum line to the PVC hose, this eliminates the PCV system, and see if that reduces the back pressure, the only other thing it could be is bad rings ( just a note, did you recently start using synthetic oil ?)

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How many time a day do you put water in the car. thats for you to know you could have a slow leak
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GO TO THE AUTO PARTS STORE AND THEM FOR THE KIT TO TEST TO SEE IF YOUR HEAD GASKET ARE BLOWN

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