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Old 08-02-2006, 01:13 PM
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Sounds like the classic injector/return line problem. Engine roughness is due to so much liquid being in the crankcase, which is interfering with the dynamics of crankshaft rotation.

You should be able to detect a problem with an injector by looking at injector balance with a Tech II. There's also a fuel injector return flow test that can be done to confirm/eliminate the injectors.

However, getting a new pump might be a good thing if it's on their dime - even if they have to replace the injectors later on. If it's on your dime, I'd push for them to replace the injectors first.

Jim
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