Thread: preheat light
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Old 05-29-2002, 05:07 PM
JimSmith JimSmith is offline
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596

That sounds like you have a single or maybe two glow plugs that are not performing correctly, or are on their way out. If they are burned out the system usually causes the glow plug indicator lamp on the dashboard to light up oddly. If they are getting poor electrical connection to the system, they will just not get hot enough in the allotted time. I do not think the timer circuit is "smart" enough to notice whether or not the electrical connections are good or bad as long as they are not open or short. I would check the connections, clean them and put them back carefully, then check the performance again. If it is still bad, maybe you have some bad plugs, in which case, take them out and check them with an Ohmmeter. Jim
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

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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