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#1
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Car not Choking at cold start??
Just got this 89 260E. Have already had to replace the fan cluch and the water pump. Next planned repair is a Cruise control switch replacement. Then my auxilary fan keeps blowing it's fuse and will not work. But before that I would like to know why the car doesn't idle high when it's cold. I have to apply gas for the choke session (5-10min) or car will cut off; from being too cold I guess. Any Ideas?
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#2
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Has to be a bad idle control valve or a big vacuum leak. Idle control valve is under the air cleaner housing, two wire plug and two big hoses. Clean it out with carb cleaner, and replace the hoses if they are hard, they leak badly in that state.
You should get about 1000 rpm on initial startup, dropping to the normal 500 rpm in gear in a couple minutes. If you have to keep your foot in it to keep it running cold, you probably have a serious vac leak that the feedback system cannot compensate for. Check idle control valve hoses, trasmission modulator line, charcoal canister purge lines, and any other vac lines you can find. Typically, by this age all the rubber connectors are shot, so plan on replacing them all. You can use standard vac hose for the stragiht ones, but the "y" and "t" ones I'd get from Benz or an independent, you really need the proper ones. You will probably need to adjust the idle mixture after fixing the leaks. Merry Christmas! Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs! |
#3
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It is you water temp sensor! It tells the CIS-E system when the engine is cold and when to activate the Cold Start Valve as well as the IACV to increase idle. Less than $50 and is the most likely problem. I have posted test procedures for it a bunch of times here so search my userid.
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~Jamie _________________ 2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's. 1986 190E 2.3 Black, Auto, Mods to come soon..... |
#4
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Thanks for advise on the water temp sensor. I've been told there are numerous sensors associated with water temp. which one should I go after. the temp guage works fine.
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#5
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The cold start valve is controlled by what is called a "thermo time switch". It operates only when temp. is below 59degF and has no effect on the idle speed itself.
The cold start valve is only opened for a few seconds (about 20sec. at -20C) after the engine has started. So, if your car starts OK, but fails to idle, the problem is very unlikely caused by your cold start valve or the switch triggering it. Look for vacuum leaks, idle control valve, bad spark plugs, distributor cap, rotor or spark plug wires. A partially clogged fuel filter or low fuel pump pressure could also be the culprit. |
#6
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Quote:
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~Jamie _________________ 2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's. 1986 190E 2.3 Black, Auto, Mods to come soon..... |
#7
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Read through this thread It covers my experiences with a cold-blooded 260E and probably has your fix buried in it.
I'd start with the coolant temp sensor. It's on the top of the head, near the rear, driver's side. It's the one with two seperate contacts. The sensor with a single contact is for the dashboard gauge & the one with three or four turns the electic radiator fans on. Best of luck,
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Norm in NJ Next oil change at 230,000miles |
#8
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-20 15.7KOhm
-10 9.2KOhm 0 5.9KOhm 10 3.7KOhm 20 2.5KOhm 30 1.7KOhm 40 1.18KOhm 50 840Ohm 60 600Ohm 70 435Ohm 80 325Ohm 90 247Ohm There is the table. Yeah I did actually read that thread after I posted as I thought your issue seemed familiar. I mention the Temp Sensor as a start. It will verify at least if it is working before delving into the Idle Control section. I learned the hard way not to screw with that side until everything else is looked at and perfect first. Not that what you mentioned is not the problem just that it is easier to test the Temp Sensor First. With both of use maybe he can get it licked. Of course when I first posted I thought the 260 had the same exact engine as the 190E 2.6! It seems to be but now I am not so sure if there are identical or if the 190's is a newer design than the 260's was.
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~Jamie _________________ 2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's. 1986 190E 2.3 Black, Auto, Mods to come soon..... |
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