1972 250c wont idle and have to keep foot on gas pedal? - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 06-26-2008, 09:33 PM Thread Starter
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1972 250c wont idle and have to keep foot on gas pedal?

Hello My 250 c wont idle in park or in gear. I have to keep the foot on the gas or it will stall. The carburetors seem very responsive and work flawlessly other wise. Is there something that is supposed to keep the car running electronically on the carburetors? I have cleaned them with carb cleaner and still no help. If you stand on the passenger side and look at the carbs there is a white round plastic piece on each of them..my rear one has a burn mark on it. What are these and can I raise the idle on these? Thanks so much in advance. Nate
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post #2 of 12 (permalink) Old 06-27-2008, 11:47 AM
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One common problem is the idle solenoids. They are in the front of the carbs and have a pair of wires running to them. With the ignition on, unplug them and plug them back in. You should hear a click each time. If you don't, replace as needed.

Chuck Taylor
Falls Church VA
1998 SL500
1959 220S
1970 280SL
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post #3 of 12 (permalink) Old 06-30-2008, 11:33 PM
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i have had many problems with my carbs, including the problems you have. i sent them out and had them rebuilt by an old school merc mechanic. never had a problem after
jimmy
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post #4 of 12 (permalink) Old 07-01-2008, 10:30 AM
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Quote:
Originally Posted by ctaylor738 View Post
One common problem is the idle solenoids. They are in the front of the carbs and have a pair of wires running to them. With the ignition on, unplug them and plug them back in. You should hear a click each time. If you don't, replace as needed.
Hi - Do you know where I can find these replacement idle solenoids? I can't seem to find them online.

Thanks
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post #5 of 12 (permalink) Old 07-02-2008, 08:33 AM
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The moderator

of this forum, Ron at GermanStar comes to mind...


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post #6 of 12 (permalink) Old 07-03-2008, 10:16 AM
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thank you!

i meant to post that i managed to find the solenoids from weber directly. thanks for the hookup to germanstar though. that place looks like a gold mine.
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post #7 of 12 (permalink) Old 07-04-2008, 06:00 AM
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If you have problem with these things, don't try to resolve them on the net. Many people does that and it's not quite good. You can resolve your problem at the moment, but later? What if you'll have a bigger problem? My advise is to see a doctor. Not you of course. A car doctor.
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post #8 of 12 (permalink) Old 07-08-2008, 10:43 AM
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You should have told us that you have Webers! I assumed you had the original Zeniths.

Did the idle solenoids fix the problem?

Chuck Taylor
Falls Church VA
1998 SL500
1959 220S
1970 280SL
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post #9 of 12 (permalink) Old 07-10-2008, 08:06 AM
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I actually bought the car from porschapower, so there has been a small time-lag between his original post and my picking up on this thread.

Weber are sending them out (hopefully today), and I'll report back as soon as I have them in my grubby hands!

In other news, I've noticed white smoke from the exhaust and the oil pressure gauge is maxing out as soon as I turn the ignition. I fear that it's the head gasket, but the car hasn't been driven for some time and the fluids are old. Is there a chance at all that it might just be condensation in the oil tank and that flushing the fluids might fix the problem - or something equally easy to remedy? (I know that I'm not mechanically competent enough to attempt a head gasket fix sadly.)
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post #10 of 12 (permalink) Old 07-11-2008, 03:31 PM
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the idle solenoids arrived today and when i unpacked them they were different parts to that which i thought they were. nevertheless, i replaced them with the old ones and nothing happened. i then unplugged the wires from what i thought the idle solenoids were (the burned out looking, round white plastic things which are beside where the idle solenoid is) and plugged their wires into the idle solenoids and the car works fine.

my question now is, what did i unplug (and is it bad to have that unplugged), and where could the cables which should be running to the idle solenoids have disappeared to (or where should i run new ones from)?
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