w123 280e idle problems - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 09-27-2008, 12:37 AM Thread Starter
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Date registered: Sep 2008
Vehicle: 1980 w123 280e
Location: Johannesburg South Africa
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(Thread Starter)
w123 280e idle problems

Hi All,

I need some advice on a 280e.(K-Jetronic CIS fuel system)
Problem is when the car runs hot ie: in stop/start traffic it wont idle correctly.
It will either idle very low and or stall.I am able to restart the car easily,but it wont idle correctly.
Starting from cold is 100% but in a very hot engine it stalls.
I have replaced the following:
Fuel filter,fuel actuator,fuel pressure valve,and had CO2 level checked.

Any advice would be appreciated.
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post #2 of 5 (permalink) Old 10-19-2009, 02:38 PM
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Date registered: Jan 2009
Vehicle: SLK 230K auto
Location: Madrid, Spain
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Me too

I seem to have the same problem than you in a 1982 280 CE.

It was working fine until now and all of a sudden it commenced to stall at iddle but restarts again with no problem, to stall yet again. Being and auto i can´t play that easy with the gas to maintain revs at iddle so i get stuck everytime i come to a halt which in Madrid traffic is all the time.

So if it is not fuel nor battery or alternator, what it is then, any idea? I figure out some kind of regulator of some sort, but being myself pretty useless mechanically, I rather ask you for help.

Thank you guys

Life only happens once, enjoy!
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post #3 of 5 (permalink) Old 10-19-2009, 02:42 PM
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Check the vacuum hose that is connected to the warm-up reg.

'79 280CE with 226,000 miles
'76 240D 4 speed with 190,000
'85 300D Turbo with 266,000 miles

GONE but not forgotten
'76 300D with 195,300 miles
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post #4 of 5 (permalink) Old 10-19-2009, 02:44 PM
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this forum may have what you need already,

but off the top off my head, does your idle control screw adjust ok? sometimes they may stick one way or not change idle at all indicating the valve needs to be cleaned/replaced.

you may need to get a CIS pressure test kit and test fuel pressures at various places

the bently manual says to always check the cold start valve first to see it works correctly, a leaking csv will cause a rough idle, it is pretty much the cheapest piece of the puzzle. cause then next is the warm up regulator, distributor and accumulator.

for sale: Car Domain 80 EURO 280CE M110.984 english red, white cloth interior 194k
daily driver: 93 toyota MR2, black 5spd non-turbo, may just have to remedy that
mopar: 62 chrysler newport 4DR white 361 V8, 36k miles
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post #5 of 5 (permalink) Old 10-19-2009, 03:14 PM
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Thanks for early reply vipercrazy.

I will (my wrench rather) start from there and see if it is just that or have to follow more expensive routes.

Someone mentioned vacuum, lets hope is not that again, i have had to repair some fixtures on the vacuum lines to sort out the trans and still have to check the lines to the seats (they are not staying put). Hate the damn thing!

Life only happens once, enjoy!
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