My 2001 ML 320 is still having problems starting on the first try. The mechanic who installed a new CPS said that there was a lot of oil in the location of the CPS.

Do you think that the CPS was installed improperly or maybe there's another problem?

If the truck always starts(even if it takes 2 tries) then the crank sensor "most" likely isn't the problem.

Fuel pressure bleed-off causes most long cranking & re-cranking problems.

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