Hi all
I posted this in the ML forum with no response...can anybody help me out? Could this be something like a sticking EGR valve?

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Hi

I guess when it rains, it pours. Having probs with my SL also, but hopefully someone here can help with this ML problem.

My 98 ML starts right up, and runs great when cold. When the engine gets above 80C, it idles rough. Throttle repsonse off-idle is perfect, and the ML runs great at all speeds, accelerates fine, etc. Fuel mileage does not seem to affected. Only at idle, when warm, and then only about 80% of the time, it runs real rough.

At first, no "check engine" light came on, so it didn't set a code. But now the check engine light comes on and stays on when the ignition switch is on. I have no idea how to pull a code, but based on the series of events, I would guess that whatever is causing the intermitent warm idle roughness eventually threw something else off-kilter, causing the check engine light to illuminate.

What can I check?

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport