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Old 01-14-2008, 02:32 PM
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low compression

Any thoughts on minimum compession preasures fo a early 99 7.3?

Thanks
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Old 01-14-2008, 02:36 PM
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They should be around 400 psi, but what your are looking for is any major difference from cylinder to cylinder.
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Old 01-14-2008, 03:32 PM
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Thanks, That's what I thought, this heap has a bunch of problems, but the big two are hard to start cold and loses power and white smoke after half throttle, checked glow plug system, ok, fuel preasure and hp oil ok, injector buzz test ok but some of the injectors sound slightly muted, checked compression 350-375 psi across the board, wanted to rule out tired iron, turbo fins looked good, starting to suspect injector problems.

Any ideas are appreciated,

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Old 01-14-2008, 06:09 PM
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have a cylinder contribution test run it'll catch problems that a buzz test will not
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