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#1
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1988 300SEL Low idle at operating temp
I know this is probably a can of worms and the idle is electronically controlled but you guys are pretty damn smart so maybe you have an easy solution.
Car starts and runs great but will fairly consistently drop to a low lumpy idle after it reaches operating temp. Only does it under load though, if its in neutral it will hold around 650-700. I replaced the plugs and wires yesterday and while I did clean up the contacts on the dist. cap, that component is well used. Would that be enough to offset the idle? Starting to like this car.
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1981 300TD 2005 C55 2004 E500 1999 ML430 1992 400E 1998 C43 2001 SL500 1988 300SEL 1986 190E 16V 1991 190E 2.6 |
#2
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The idle speed is controlled by the computer/idle control system....the idle quality depends on the condition of the electricals....plugs....injectors.....fuel quality.....etc...
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#3
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Yeah I agree, I think I will go ahead and get the dist cap and rotor done and monitor the fuel quality before I worry any more about it.
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1981 300TD 2005 C55 2004 E500 1999 ML430 1992 400E 1998 C43 2001 SL500 1988 300SEL 1986 190E 16V 1991 190E 2.6 |
#4
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I've replaced pretty much everything on our 300E (aside from the wires)....and it idles around 600 in drive....so smoothly that I can't even feel it. The most noticeable change in idle quality and performance was from using Redline SI-1 total fuel system cleaner.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
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