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    M104.980 high idle again

    Hi, Ray, Thanks for your response. The throttle cable seems ok, I keep lubricating the ball joints. But definitely will check it again. For vacuum leak, has not tested all possibility, thinking of trying a smoke test
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    M104.980 high idle again

    Hi, my Merc is a 92 300CE-24 with the M104.980 engine. One of the haunting problems is the high idle and would like to seek your advice. Three years ago (2019), the idle all of sudden stuck at 1500 rpm. My mechanic tried adjusting the duty cycle without success. It turned out the air...
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    weird rev after air con is on

    Hi, Coalville126, I'm from HK. I've done nothing on the air con system and the system is cool, indeed, I am surprised that it is so cool, no problem at all to cope with the hot weather here. Let me look at the pressure switch you mentioned this weekend Thanks!
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    weird rev after air con is on

    Thanks for the replies. I should have asked my question in a more accurate way. The rev fluctuation is normal when a/c turns on, my question should be if it is normal to happen so frequently, almost every minute
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    weird rev after air con is on

    I notice that the rev keeps bouncing almost every minute after I turn the a/c on. Usually, the 1st 6 to 7 minutes are fine, then the rev goes down and bounces back every 40s to 1 minute. Look like the a/c is on and off. Just wonder if it is normal. I recorded a video and it is here. In...
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    Vacuum tube to climate control air flow speed control

    Hi, I've just bought a 92 300CE-24. Once the engine is started, I hear "hee-hee" from the central console. It turns out coming from the air flow speed switch - the left dial in the following picture: I get it out As you can see there are 2 nozzles that connect to 1 vacuum tube in...
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