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Old 10-08-2010, 10:32 AM
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Ok now I have no idea.

I went out and did a little test. I have a pcv on one valve cover, and a breathr on the other.

- First I plugged the PCV hose, pulled the breather, and put duct tape over both holes in the valve covers. At idle and at part throttle, both buldge out like there is air trying to blow the tape off.

- Second, I put the pcv valve back in the valve cover and left the tape on the other valve cover. It sucked in, trying to pull the tape in the hole.

If I were to have an internal vacuum leak, wouldn't it have been trying to pull the tape into the holes to begin with?

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  #62 (permalink)  
Old 10-08-2010, 11:35 AM
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Okay we know that the pcv is working as it should. And you are probably right about the vacuum leak test . As for the blow by test. If you have a compression gauge with a hose , you can take the spark plug hose adapter off of the hose and hook up shop air to it . You will have to back off the rocker arms first . When you apply full shop air pressure the engine will spin a little to get the piston that you are checking to the bottom of the bore , so keep your hands clear of the fan , etc. If you have piston ring blowby , you will definitely hear it from the crankcase breather . If you have a valve problem you will hear it in the intake or exhaust depending on which it is. Check each cylinder . I would definitely do this before pulling any cylinder heads so that I would know how deep the problem is .
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Old 10-23-2010, 12:45 AM
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Okay, it is definately an internal manifold vacuum leak. I am going to have the intake milled unless anyone has a better idea. By the way, thanks again for the help folks!

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Old 06-25-2013, 10:08 AM
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