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1975 mercedes R107 450sl idle speed

  • stylesmerc
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22 Feb 2019 10:49 #203817 von stylesmerc
1975 mercedes R107 450sl idle speed wurde erstellt von stylesmerc
hi does anyone know how to adjust 1975 mercedes R107 450sl idle speed.
Mine is running about 200rpm in gear and when not in gear about 500rpm.
I know you can turn a screw next to the cold start valve but when i turn that up and start the car first thing in the morning
the engine idle go's high then low high and low for about five minutes till the cold start does it job or reaches temperature.
when i drive the car she's very smooth its only when i come to a stop she's very low.
Any help welcome mem.

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22 Feb 2019 12:28 #203821 von Obelix116
Obelix116 antwortete auf 1975 mercedes R107 450sl idle speed
Hi,
would be nice if you could tell us also your name , that makes the conversation nicer .

Greets
Christian

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22 Feb 2019 12:36 #203822 von stylesmerc
stylesmerc antwortete auf 1975 mercedes R107 450sl idle speed
sorry my friend its mehmet

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22 Feb 2019 17:15 #203833 von Dr-DJet
Dr-DJet antwortete auf 1975 mercedes R107 450sl idle speed
Hi Mehmet,

that sounds like a typical problem with your auxiliary air valve. They tend to hang and thus create either the sawing effect or too low engine rpm when cold then. I have described this AAV on my other website oldtimer.tips

Viele Schraubergrüße - best regards, Dr-DJet Volker, Admin und Betreiber dieser Webseite
Wir sehen uns bei Moseltour und Alpentour


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22 Feb 2019 18:53 #203841 von stylesmerc
stylesmerc antwortete auf 1975 mercedes R107 450sl idle speed
thank you dr-jet

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23 Feb 2019 12:15 #203877 von Dr-DJet
Dr-DJet antwortete auf 1975 mercedes R107 450sl idle speed
Hi Mehmet,

do the test that I describe there by clsoing air hose on hot engine. It will tell you whether AAV is still open and needs repair.

Viele Schraubergrüße - best regards, Dr-DJet Volker, Admin und Betreiber dieser Webseite
Wir sehen uns bei Moseltour und Alpentour


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23 Feb 2019 13:32 #203882 von stylesmerc
stylesmerc antwortete auf 1975 mercedes R107 450sl idle speed
ok will do

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23 Feb 2019 14:32 #203887 von stylesmerc
stylesmerc antwortete auf 1975 mercedes R107 450sl idle speed
i did as you described i took the top hose off and the engine went even higher then lower just as if the engine was cold but when i closed off the hose half way the engine was running good then i reversed it i took the lower hose off and that reduced the idle a little but not much this was done when the engine was warm.

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23 Feb 2019 15:12 #203891 von Dr-DJet
Dr-DJet antwortete auf 1975 mercedes R107 450sl idle speed
Hi Mehmet,

well I did not write take off the hose but close the hose by squeezing it so that air cannot pass. If AAV is closed you will then not notice a rpm change. If it is still open on hot engine, you will.

Viele Schraubergrüße - best regards, Dr-DJet Volker, Admin und Betreiber dieser Webseite
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23 Feb 2019 16:36 #203904 von stylesmerc
stylesmerc antwortete auf 1975 mercedes R107 450sl idle speed
Thank you for your advice D-jet i will try again but at same time mybe i buy a refurbished or new one just for peace of mind .
But i have a friend who is going to look at it for me and will see where it go's from there I'm in no rush but thank you again.
all the best mem

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23 Feb 2019 20:15 #203922 von Dr-DJet
Dr-DJet antwortete auf 1975 mercedes R107 450sl idle speed
Hi Mehmet,

be careful with the housing. Many people have already broken it as it is an aluminium cast. Bosch have made a repro product for the 8-cylinder engine. But it is clumsy and I was recently told that it costs 600€.

Viele Schraubergrüße - best regards, Dr-DJet Volker, Admin und Betreiber dieser Webseite
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23 Feb 2019 20:31 #203927 von stylesmerc
stylesmerc antwortete auf 1975 mercedes R107 450sl idle speed
will do i will look in to it before i buy
all the best mem

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