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Old 10-19-2001, 02:25 PM
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sixto sixto is offline
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
With the relatively low torque values of MB heads and the special tool that only allows 90-degrees of rotation at a time, it takes a real idiot to overtorque a head bolt. I suspect someone tried to put a long head bolt in the wrong location.

I doubt valves are the issue if it smooths out beyond idle. A compression test should tell you if the valves aren't seating properly.

How does the economy/vacuum gauge respond to the rough idle?

91 300SE
81 300SD
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