E-Class (W210) 1995-2002: E 200, E 220D, E 240, E 290TD, E 300TD, E 200, E 240, E 280, E 320, E 420, E 430 (Wagon, Touring, 4Matic)

Rough idle when hot, after long drive press clutch and motor shutdown

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Old 05-10-2018, 04:02 AM
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E200 2000
Rough idle when hot, after long drive press clutch and motor shutdown

Hello,

I live in Europe, in Slovakia, a couple months ago I bought a 2000 E200 gas/lpg with manual six-speed transmission. The car has 456 000 kilometers and runs rather well. Glad about buying it for 600 euros! Got a bit more in the car now with needed repairs.

Here we have inspections evrey two years for mechanical and emisions.
I was just in for my emissions test and the car failed. A mechanic friend was talking about opening the motor putting new piston rings and so on. His toughts were that the emison fail was simply due to normal wear from the engine.

I am wondering about the cause of the emisions fail as the motor does not have any major issues. I do have minor issues with idle sometimes. It made me wonder if the emisions problems could be related to a sensor or something like it.

Starting: most of the time, the motor starts fine but sometimes I will need to hold it 5-10 second to start and when that happens it idles rough (maybe just normal that it idles rough after that).
Driving: After driving at the same speed for a while (on the highway for example), if I press the clutch and just let myself go, often the motor will almost always shutdown.
After a long drive, if I stop at a light the idle will most often be pretty rough

If I have to open the motor, I will, but if the cause could be simpler, of course I would be happy.

I have a very minor exhaust leak on the exhaust manifold on one cylinder.
I do not have any lights on.

Tell me your toughts
What do you think?

Last edited by SlovakiaE200; 05-10-2018 at 04:04 AM.
Old 05-12-2018, 09:55 AM
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Can you suggest an excellent Slovak wine??
Old 05-12-2018, 02:52 PM
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1999 E240, 2007 GL500, 2004 Suburban Z71, 1997 Ford Escort MK7, 1979 VW Beetle
Hi Slovaskia, have you tried to replace the spark plugs and spark wires? Can you test the energy that the ignition coils use when the engine is working using a oscilloscope? This test can indicate if the coils are bad and also helps identifying a spark plug and spark wires.
My car had an issue like that and were the spark plugs and spark wires, after replacing then it worked fine.
Old 05-14-2018, 03:31 AM
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Originally Posted by Plutoe
Can you suggest an excellent Slovak wine??
Anything from Modra or Topolčany I would say
Old 05-14-2018, 03:35 AM
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Originally Posted by machadosl
Hi Slovaskia, have you tried to replace the spark plugs and spark wires? Can you test the energy that the ignition coils use when the engine is working using a oscilloscope? This test can indicate if the coils are bad and also helps identifying a spark plug and spark wires.
My car had an issue like that and were the spark plugs and spark wires, after replacing then it worked fine.
Good thinking! I have already changed the spark plugs when I bought it, but not the small cable. I could take out the valve cover and spray water on one by one and see what that does. I do not have an osciloscope, but I will take it to a shop that could see if the problem lies with a sensor or egr or anything like that.

It really does not feel to me like the engine is the problem. But I might be wrong, everyone says the norms are so strict for petrol engines here that simple wear could be the problem failing emmisions...
Old 05-28-2018, 03:17 PM
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Hey,

in the end the problme was the fuel pressure regulator that went bad and a little hose that was unplugged. The hose out from the feul pressure regulator was broken open too.

All fixed

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