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Old 08-09-2008, 01:59 AM
whunter's Avatar
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,363
Please look at

your fuel thermostat.

MB# 601 070 02 82

#. 125 in the attached picture.

O-ring #. 149 is a common failure item.

If the O-ring fails = sucking air into the injection pump.
Some symptoms:
* Sputtering
* Poor performance
* Erratic idle
* Lack of power
* Stalling
* Difficult or impossible to start

To test this, you can join hoses #. 197 and #. 191 = bypass it, and take the car for a 1 - 3 mile drive.

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