I'm pretty new to this but the things that jump out at me from the FSM is

1) Clear the fault codes after testing
2) The procedure for setting the mixture is pretty involved - see chapter 07.3-110 para 24 for example

FSM is available for free and legal download via www.startekinfo.com
Click on B workshop resources
Click on CD/DVD
Click on W201(easiest to reach M103 data this way as the W124 manual sometimes has internet glitches)

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!