Idle speed, and ALDA adjustment?? - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 03-18-2010, 05:43 PM Thread Starter
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Idle speed, and ALDA adjustment??

I was wondering how to adjust the idle speed in my 85 300D. Oil pressure drops low to none right now, but if i give it just the slightest tip of the toe on the accelerator it runs much quieter and oil pressure stays at the perfect level. I figured speeding up the idle just a hair would be a good remedy.

I also was wondering how to go about adjusting the ALDA. I've heard it can be harmful if not done properly. I'm not looking to make it into a tire burning monster, just keep up a bit better at the lights. Could i just give it an 1/8th or 1/4 turn, or should I be adjusting other things as well when doing this. And I would guess the car could/should be running while doing it, but i figured better safe than sorry and assume that. I've never seen a puff of black smoke come out aside from one or two realllly cold starts. So I think i could give it a bit more safely.


any responses appreciated, pictures with them greatly appreciated. Thanks in advance! I've checked a few posts about the ALDA adjustments, but nothing to really gauge how much would be good to do.

"it's more fun to drive a slow car fast then a fast car slow"

1982 240d - DD
1985 300D - pickin and stripping away
1987 300TD - poor beaten work truck
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post #2 of 7 (permalink) Old 03-18-2010, 06:15 PM
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The idle adjustment is done with the screw between the IP and engine, it has a (14mm) lock nut at the bottom, I use a three inch socket to reach the lock nut, then just a flat blade screw driver. Clockwise to increase idle, go a little at a time.
The ALDA will probably have a black cap surrounded by a metal cup that covers the screw you need to get to. Remove the cover, loosen the lock nut, turn ccw a half turn, test drive.
Pics show one with the black cap, the other it has been removed.
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post #3 of 7 (permalink) Old 03-19-2010, 07:38 PM
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Make sure the banjo bolt is clean of soot or the alda won't sense added pressure. The bolt is on the rear of the engine by the air cleaner. Follow the lines from the alda to the pressure regulator then to the banjo.
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post #4 of 7 (permalink) Old 03-20-2010, 03:46 AM
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Originally Posted by drizzy View Post
I also was wondering how to go about adjusting the ALDA.
Do not adjust the alda except as a last resort after every other area that affects power has been explored.

Quote:
Could i just give it an 1/8th or 1/4 turn, or should I be adjusting other things as well when doing this.
No. Doing so only covers up any problems that might exist. There is a whole laundry list of things to check, clean and adjust before the ALDA.
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post #5 of 7 (permalink) Old 10-16-2010, 04:52 PM
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Correct Idle Speed for 85 300D-T?

Before I attempt an adjustment...What is the correct idle speed for the 617 turbo engine? In park? In drive with brake applied? I've seen different numbers listed in specs. Mine idles at close to 900 rpm in park. Seems a little high.
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post #6 of 7 (permalink) Old 10-16-2010, 07:10 PM
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Idle speed should be 700–800 rpm in P without A/C.

After adjustment, test in D with brake applied and with the A/C, see if the engine runs smoothly. If not adjust rpm upwards.

What kind of tachometer do you use? The on-board one isn't accurate enough.
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post #7 of 7 (permalink) Old 10-16-2010, 07:15 PM
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MB calls for ~750, 900 is too high, turn it down.

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