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  #1  
Old 10-31-2020, 03:30 PM
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75 450sl (107) lopes when cold start

Hi, Car lopes when cold start but is ok when warmed up. Any suggestions?
Looked for vac leaks can't find any. Thanks all.

Joe R.

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Old 10-31-2020, 09:35 PM
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Originally Posted by joedee View Post
Hi, Car lopes when cold start but is ok when warmed up. Any suggestions?
Looked for vac leaks can't find any. Thanks all.

Joe R.
Likely the AAV (aux air valve) sticking. You could try taking it off and soaking it in solvent an/or simple green. Cool the bulb then heat it and repeat cycle including cleaning in-between.

The valve should close at about 150F and be fully open when cold.

If this does not work, you can dismantle the valve and give it a more thorough cleaning.

Several threads here in and in Benzworld 107 forum. This is a long one but you will find out how to dismantle fairly early on: https://www.benzworld.org/threads/aav.1592399/
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85 300D,72 350SL, 98 E320, Outback 2.5
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Old 11-02-2020, 08:23 AM
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AAV is correct, but the ECU cuts out the fuel at 1500 rpm I think, and then starts it up again. So maybe you can resolve the problem by tightening the idle screw a bit.


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Old 11-02-2020, 09:55 AM
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AAV is correct, but the ECU cuts out the fuel at 1500 rpm I think, and then starts it up again. So maybe you can resolve the problem by tightening the idle screw a bit.
You are right Fonzi. joed could try that. But then he should see what idle speed is - might be too low. Should be about 700rpm when warm.

The other thing he could try (if it is still flexible enough), is to squeeze the elbow on the outlet of the AAV when car is warmed up. The idle speed should hardly change if the AAV is doing it's job and has closed.

joedee, you might check out the Benzworld 107 forum. Much more active regarding 107s and djets.
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  #5  
Old 11-04-2020, 06:14 PM
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450 sl lopes

HI,

Thanks for the info. Will try looking a the AAV cleaning and saee what happens.

Thanks again,

Joe R.

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