S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

rough when cold and other probs :( this car is driving me nuts!

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Old 02-29-2008, 10:05 PM
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merc 126 500 sec 1984
rough when cold and other probs :( this car is driving me nuts!

hi, can anyone suggest what i should check and how?

im assuming its something to do with the auto choke or a sensor??


also, sometimes the rev counter seems to think i'm reving twice as much as i really am and then it seems to hit the limiter too early.

how do i get to the sensor on the gear box that senses when im in park?


the other day the engine temp went quickly and crazily up to 110 on the motor way and then went back to normal... no signs of mayo in oil or water, no trouble since... faulty gages??
thanks ppl!!



wonder if i will ever run out of questions!!!
Old 03-01-2008, 05:04 AM
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It sounds like you are having some electrical problems. Some of the rouhs running when cold can be due to temperature sensors being bad, but since you car seems to have electrical issues, I would check the grounding and check for shorting in the electronics before replacing parts that may be working properly.

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