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#1
01-20-2007, 10:28 AM
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1988 300E Strong Surging and Electrical System Fluctuations
My 300E, a manual transmission model, has begun to experience engine surging as the temperatures have dropped here recently, and, along with the engine (and speed) surging there is a brightness fluctuation of the head lights and dash lights. I suspect the voltage regulator has given up the ghost, but don't understand how that would cause the engine to surge. Anyone else ever have this same experience? Any fixes? Thanks, Jim
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Own: 1986 Euro 190E 2.3-16 (291,000 miles), 1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000, 1988 300E 5-speed 252,000 miles, 1983 240D 4-speed, purchased w/136,000, now with 222,000 miles. 2009 ML320CDI Bluetec, 89,000 miles Owned: 1971 220D (250,000 miles plus, sold to father-in-law), 1975 240D (245,000 miles - died of body rot), 1991 350SD (176,560 miles, weakest Benz I have owned), 1999 C230 Sport (45,400 miles), 1982 240D (321,000 miles, put to sleep) 
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#2
01-23-2007, 01:32 AM
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Just to finish out this topic for anyone else having similar symptoms, it was the voltage regulator. At idle it was turning out 19 Volts DC and less than half a Volt AC, and at speed it was likely tripping the OVP relay, which shuts off the fuel pump, among other items. So the varioius protected items would shut off and wait for the engine rpm to drop low enough to bring the voltage below the threshold for the OVP interceding to protect various items. Which showed up as surging and bucking. Battery may have been damaged too, so I rinsed the area with a copious dousing with water and baking soda.
All is back to normal. The new voltage regulator is a Bosch item made in Spain, I believe, while the old one was a wierd brand I never heard of before, god knows where it was made. It looked fine, more than half the brush length still there. Jim
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Own: 1986 Euro 190E 2.3-16 (291,000 miles), 1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000, 1988 300E 5-speed 252,000 miles, 1983 240D 4-speed, purchased w/136,000, now with 222,000 miles. 2009 ML320CDI Bluetec, 89,000 miles Owned: 1971 220D (250,000 miles plus, sold to father-in-law), 1975 240D (245,000 miles - died of body rot), 1991 350SD (176,560 miles, weakest Benz I have owned), 1999 C230 Sport (45,400 miles), 1982 240D (321,000 miles, put to sleep)
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