Mercedes-Benz Forum - View Single Post - M103 Rough idle and vacuum leak
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post #119 of (permalink) Old 01-19-2018, 01:29 PM
BenzWorld Member
Date registered: Apr 2011
Posts: 75
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Quoted: 19 Post(s)
>>“lack of power before the car heats up“. And taking care of the matchingly missing, but necessary, proper signal to the CIS-ECU to activate acceleration enrichment (as confirmed in post 104) should be the next step, shouldn't it.<<

I am not sure. 5k ohms seems like an odd amount. 5M ohms maybe, which for all intents and purposes is an open circuit. When I go back to the original post, I see other signs that the engine is getting too much fuel. Stepping on the gas to start the car opens the micro switch, which, I believe, takes the car out of its start programming, which in most cases has fuel enrichment built in. i.e. cracking the throttle during start up actually supplies less fuel, which may have been why he was able to start the car that way. Note that I had to do just that, in fact, I put a little piece of vacuum hose under the micro switch to keep it open until I figured out that my FD was delivering too much fuel at idle and made what became the problem solving adjustment. No more micro switch always open band aide required.
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