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Old 10-24-2001, 09:15 PM
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Question Is there a rev limiter @ 4000rpm for the W124 M104 engine?

This afternoon I was slowly revving up my engine to see if there was anything amiss with the ignition, timing, etc. The gauge is clearly marked with a redline zone starting at about 6900 rpm, but right when I got the engine up to 4000 rpm, it started to stumble. It was not so much a stumble, as a deliberate shutting down of cylinders to prevent revving beyond that point.

Am I correct in determining that the factory has a rev limiter built in at this point, or do I have a problem that needs further investigation?

I don't drive the car hard, so it really never gets past 3500 rpm.
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Old 10-24-2001, 09:16 PM
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Yes, in drive and neutral you will have a rev limiter.
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  #3  
Old 10-24-2001, 09:37 PM
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Park/Neutral , 4K limiter for torque converter protection.
Over-ridden by speed sensor once car is moving in excess of 3 MPH.
The limiter works by interrupting FI and retarding timing.

There is also a power- train limit of 3500 for 1 sec. when
engaging the trans at speeds below 18mph.
Lastly, for in gear engine protection, first 3.5 sec. limit is 6600, 6400 after 3.5 sec.
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Old 10-24-2001, 10:33 PM
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I forgot to mention that the transmission was in "Park" when I performed this test.

Whew!! Thanks for the reassurance!! Now that THAT'S figured out, I can continue fixing all of the other little quirks needed to get the ole 93 back to 100%!

Wish every car I've owned worked as well as a Benz!
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  #5  
Old 10-24-2001, 11:52 PM
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Hey, on the same idea, I have a 92 300E with the m103?? engine?? Yea, I think so, well, its the 3 litre inline 6 that comes stock, anyway, when you are in drive, and hold down the brake, is the engine only supposed to rev to 2k rpm? I was getting new tires the other day, and I figured id do some burnouts with the old tires just for kicks, but when I held down the brake and mashed the accelerator, the engine stopped at 2k rpm. Not wanting to break anything, I immediately backed off and just went and got the tires changed. But yea, is it normal for the revs to stop at 2k? And does this mean no burnouts in my benz? (Not that I would do it often, just a good thing to know before you try to do an obnoxious peel-out for a bunch of ricers... and then find out that you can't... and lose face...)
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Old 10-25-2001, 10:23 AM
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Yeah, it's the "Lose Face to Ricer" feature.....
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