'78 280CE runs rough after warmed up - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 07-18-2009, 01:14 PM Thread Starter
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'78 280CE runs rough after warmed up

I've had the oil changed, i even tried the 10w40 oil for older cars, i've changed the spark plug wires, the air filter, and i don't think the vacuum is leaking.

once my car is warmed up, especially if it's a hot day, the engine will shake a bit and sometimes the car will stall when stopped at a light. i often have to put it in neutral and give it a little bit of gas at stop lights if i've driven it for a little while and the car has warmed up.

it also doesn't go well from highway driving to city driving.

any ideas?
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post #2 of 9 (permalink) Old 07-19-2009, 06:19 PM
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what kind of plugs did you use?

'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
"83 300D with 174,000 miles

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post #3 of 9 (permalink) Old 07-19-2009, 06:40 PM
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Stewart, it seems that he only replaced the spark plug wires. Could be a case of a dead spark plug.

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post #4 of 9 (permalink) Old 07-19-2009, 10:45 PM Thread Starter
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i hope that's all it is...

today it was worse. i drove for a while and the car started to lose acceleration going up a hill. i managed to get it back, but it did backfire once. then it wouldn't start up again. i'm wondering if too much gas is being sent into the engine.
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post #5 of 9 (permalink) Old 07-20-2009, 03:25 AM
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Check your plugs - you'll have significant fouling if it's too rich...
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post #6 of 9 (permalink) Old 07-25-2009, 04:44 PM Thread Starter
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OK. the plugs were the problem for it losing engine power, but i'm still having trouble with a rough idle after the car is warmed up. the car shakes and sometimes stalls at lights once it is hot. what could this be?
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post #7 of 9 (permalink) Old 08-06-2009, 06:46 PM
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I had that problem when I first got my 1980 280ce. It just required an adjustment of the mixture screw and idle screw. Other areas to check would be your warm up regulator, fuel filter, fuel pump...
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post #8 of 9 (permalink) Old 08-08-2009, 05:53 PM
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Run a can of 44k in the gas, you have injectors spraying improperly. A thread, not a cone. A common problerm.
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post #9 of 9 (permalink) Old 08-16-2009, 08:39 PM
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Edited to add, that vacuum connections and old important rubber lines are enemies of proper mixtures. Leaks suck, literally.
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