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#1
01-22-2007, 07:40 PM
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77 450 sl surging and stalling
I took my 450sl for a ride this weekend, and a problem repeated itself again that I thought was gone. After the car runs for approx 5 minutes it starts to surge like it losing fuel delivery. When I came down to a idle, the tach bounced from almost stalling to 1400 rpm. When this happened the fuel pump could be herd surging up and down. This was very rythmatic and continued until I shut the car off. Let it sit for 5 minutes and off you go for a couple of minutes and the cycle repeats itself. Anyone ever had a fuel pump relay cause this? Givin enough time the car will stall out.
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#2
01-23-2007, 01:41 AM
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Similar symptoms on my 1988 300E, turned out to be the voltage regulator. When it is acting up check the voltage at the battery terminals. Should be about 14.5 Volts or less at idle, no other loads. Mine was 19 Volts. Check the A/C voltage too, should be less han half a Volt, any more and the rectifier diodes are gone. New alternator or a rebuilt needed to fix that. The high voltage on my car causes the overvoltage protection (OVP) relay to deengergize the fuel pump, the ABS system and some other stuff, which causes the engine to nearly stall. At the lower engine speed the system voltage drops below the point where the OVP intercedes to protect, and the relays are reengergized, and the engine springs back to life. 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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#3
01-23-2007, 09:22 PM
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for the 77 450 sl what is the basic idle rpm hot if adjusted over 1,000 rpm may cause high idle to be to high causing to much air to enter fuel injection system causing surge reajust idle screw on engine to 700 rpm also may have faulty warmup fuel regulater causing fuel ratio problems
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#4
02-05-2007, 08:00 PM
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Ok, I can report as to what my problem was. The fuel tank was dirty causing the screen to plug up on the bottom of the tank. This would starve the fuel pump and cause it to surge up and down as it got fuel. This caused the idle to to jump up and down until the car stalled.
The cure was to pull the fuel tank, have it cleaned and religned. Change the screen in the tank, and replace the fuel filter.
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