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Old 08-25-2004, 10:43 AM
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Join Date: Jan 2004
Location: San Antonio, Texas
Posts: 46
Start and Idle/Vibration problem. 300E (124)

I am amazed at what I learn here. I have had a problem for quite a while with hard start, rough idle, and vibrations at low RPM. I have even rigged a bypass on my cold start valve to assist cold starting. While reviewing posts, I ran across a mention of the OVP (Over Voltage Protector). The description seemed to be close to the problems I have. I did a search on OVP and reviewed other post and saw many cases that were similar to mine. I went right home and found my OVP (which I never knew existed) and low and behold, the fuse was blown. I replaced the fuse and I now have good starts, idle and a lot less vibration. What a cheap repair! all that for a fifty cent fuse. Another area I was concearned with was very low to no oil pressure at idle and fluctuating oil pressure at 2 to 3K RPM. Again the post suggested replacing the sending unit. That worked also. Pressure now holds a 1+ bar at idle with no fluctuations at speeds. . Thanks to all!

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Old 07-02-2005, 09:52 PM
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I have the identical problem. Where is this OVP??
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Old 07-03-2005, 12:36 AM
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Behind the battery. Pull off the black plastic cover over the computer and relays.

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