Bad valve? cranking rhythm? V-6?


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Posted by Chriscase [107.194.22.254] on Thursday, May 08, 2014 at 15:53:06 :

In Reply to: GM HEI....I know, but it's in the Dodge. posted by Caleb in Manhattan KS [70.184.232.53] on Thursday, May 08, 2014 at 14:43:38 :

First step of every tune up- Cranking Rhythm Test. You can hear as little as 5 psi. :

Disconnect the coil, so no spark, and crank it. It should go wump-wump-wump-wump-wump-wump. If it goes wump-wump- oooo-wump-wump-wump, that means that one cylinder is low on compression. If so do a compression test w/ gauge, and get back to us. All cyls should be within 10%. Like 90-100, OK.

If it is a V6 Buick/GM, it may have mismatched components- cam, crank, dist must all be either even fire, OR odd fire.



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