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cstaples

Mechanical E7 skip/pop

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My 97 mechanical E7 has a pop out the exhaust on 1 cylinder when idling or not under a load. Also when the throttle is unloaded (cruising)  around 1000 to 1300 it seams to skip and shake. No funny smoke cold or hot. Full load, no pop, no skip pulls VERY good. I have cracked the lines...does what its supposed to, adjusted valves, been to a good Mack garage and they couldn't find a good reason. Any thoughts? Thanks in advance, Chris

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swap injectors with a different hole and see if the problem follows,

how tight are the valve guides ? ........or possibly a sticky valve bridge.  

perhaps a broken valve spring .....enough pressure to close it most of the time....but not all the time. 

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