My 1984 300SD has a rough idle with the air conditioning on. The valves have been set and the a/c works (blows cold). Any ideas on how to remedy this? Thanks for the input.

It may be that you idle is just a tad low. I have the same issue with mine and if I just rest my foot on the pedal enough to raise the idle 100 rpm or so it smooths out. Eventually I will get around to adjusting the idle a bit but for now this method works ok.

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Joe

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1980 300SD - 495k miles - 'The Ambassador'
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Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD

I recently had a problem with my car doing the same thing - my alternator had a missing bolt holding it in place, and for some reason only "shook" the car with the ac on.

Mine had the same problem. The idle was set around 750 and when the compressor kicked on it would drag the idle down enough to cause some wicked shakes. I raised the idle to about 800, I'd say, and now it feels the same whether the compressor is on or off. You can't even really tell when the compressor kicks on.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo

I can't find a socket deep enought to allow me to loosen the locking nut to even adjust the idle. I have the same issue when the A/C compressor engages.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Look for a 1/2 inch drive socket, they are usually deep enough and you can fit a screwdriver through the opening to adjust the screw.

That is what I have, but the sloted part is up so high that the socket will not seat on the locking nut.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Thanks for the replies. I didn't realize that anybody replied until today. I guess this forum doesn't send an email out to advise you. My fault I didn't check.

You can set the forum to email you when there are responses to a thread you are subscribed to.
In the User CP under Edit Options.

__________________
Joe

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1980 300SD - 495k miles - 'The Ambassador'
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD

Thanks Joe

Kevin