Epc mercedez benz c220d - 220 Mercedes-Benz Cars & Trucks

SOURCE: while in park 1988 mercedez benz 190e idles rough and sometimes

This is an interesting part, and I spent quite some time to fix the problem. I list it here those steps in the order could fix the problem ranging from least expensive to most expensive steps. It just happened to me the last one really eliminated the problem. 1- Make sure it gets turned up first. 2- Adjust cables to increase idle. There are two cables. You remove the air filter to see them clearly. a- one for the gas, the other for transmission. b- clean the area well so you can see a micro switch. This switch called cut off switch. c- whatever adjustment you make, the level of the switch has to press on the switch to maintain the idle. If you see it off, you can bend the metal part to keep it in place 3- Take off the Fuel distributor to clean the throttle below it. 4- Replace all the injectors. These are not Electronic Fuel Injectors so you don't have to deal with Injector module. 5- Replace the fuel distributors. Good luck.

SOURCE: FIRING ORDER OF 420 SEL MERCEDEZ BENZ 1991

15486372 With the number on thru 4 cylinders on the right bank and 5 thru 8 on the left bank as seen from the drivers seat.