1192 190e 2.6 runs great on the go at a stop or red light it idles really rough rpms drop got a complete tune up in march started a week ago off and on mostly on

Just by chance a vac hose has slipped. Lift air breather assembly and look carefully at all vac lines/hose that may be disconnected.

Another member reported disconnected vac line was cause of sloppy engine idle. Just forgot to reconnect all of them when reattaching the breather assembly.

Hope this helps.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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coil???

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Timothy Evans
TimEvans35@gmail.com
CELL 310 990 6780


1985 380 SL
2010 CL 6.3 AMG
*2009 CL 550 Sport 4matic
New addition-1984 380 SE
Newest Edition 1986 300E AMG

all vacuum lines are connected, and in good shape i,ll keep trying. thanks.

Have you replaced the OVP and checked engine mounts?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
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2003 Gray Mercedes ML350 - 122k

it really sounds like the OVP or the CPS or the coil.

__________________

Timothy Evans
TimEvans35@gmail.com
CELL 310 990 6780


1985 380 SL
2010 CL 6.3 AMG
*2009 CL 550 Sport 4matic
New addition-1984 380 SE
Newest Edition 1986 300E AMG

replaced wires and plugs smooth out a little. what is the cps?

Crankshaft Position Sensor

Have you tried cleaning your Idle Control Valve? Recheck those vacuum hoses going to and from the Idle Control Valve...both ends!

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

I had the same issue end up replacing fuel filter, ignition cap, rotor and spark plugs. After replacing all these items the problem still persist. After awhile it got difficult to start. I found a post here and recommendation to replace OVP relay. I had a used one in my parts bin that finally fix the problem. I suggest find a use OVP in your local junk yard because this is expensive item to buy for testing unless someone in this forum can show you how to test your old OVP.

As you can see in the schematic, 12v Battery is supplied to terminal 30 and is fused on top. Ground on term. 31 and Ignition Battery on term. 15 operates the Relay, thus completing the circuit to supply term. 30 battery to terminals 87Eand 87L only when the relay is operated. I performed a bench test on my OVP relay to verify these measurements.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

thank you members, i will try these things and get back with you all.

cleaned the ICV, replaced the OVP, rechecked vacuum lines both ends of ICV still rough

OK, instead of throwing more parts at your car, try this. After the car is warmed up, remove the air cleaner and start the car. If it is idling rough, very very slightly push down on the air plate to see if it makes a difference.
When mine had the same problem I finally had to adjust the fuel mixture at the tower to correct it. It still had the factory seal, so I cut off the top to get to the adjustment. It's been a year now and still running smooth and strong.

The pictures are not of my car, but are used for reference.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

still rough done all the above, even more with the air conditioner could it be the coil???

OK, so you had a tune up in March. Were the spark plug wires replaced with Bosch original type? Non-resistor spark plugs? New rotor and distributor cap?
How about the O2 Sensor...has it been checked?

I would consider doing a compression test to eliminate a valve/head gasket issue.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible