PeachParts Mercedes-Benz Forum - View Single Post - How to systematically troubleshoot rough idle

stormyc88 · #2 02-05-2013, 07:02 PM

I guess it's possible there could be a small leak in either the EGR itself or the tube that foes from it and any associated connections, that may cause your exhaust smell in the cabin when stopped, if theres no leak in your exhaust system. I have no idea what the vacuum value is supposed to be there.

How's the fuel injectors? If they're old they might not being spraying like they used to...

And of course check the condition of all the rubber bits, such as the hoses to/from the ICV, the boot between the air meter and the throttle body, and the other little elbows/hard lines. There's tons of stuff that could play a part in a rough idle.