E12 Solex 4A1

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exorcism
Newbee
Posts: 11
Joined: Tue Jun 14, 2022 10:11 pm
My E21(s): E12 520 1981
Location: Bolsward
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E12 Solex 4A1

Post by exorcism »

Hello ,


I bought a pretty decent E12 from 1981 , model 520 with a solex carburator .
Its an automatic , and i have a problem with stalling .
When i start it cold , it runs good , when i push it to Drive of Reverse the engine RPM drop , and stalls most of the time .
I replaced sparkplug / filters / vacuum hoses last week . did not help 1 bit i thought it was a vacuum leak .
but i 'cheated' and turn in the screw at the idle control valve so i drive the car , but in park or neutral the RPM is pretty high , too high voor my liking .
also i dont think my second stage is working correctly .
when i do it manually 'full throttle' , 9 times out of 10 the second flap only opens 10% , and 1 in 10 times the flaps open all the way .

Answers in english or dutch ar appreciated :thnx


E12 520 automatic . F31 320D M-Sport
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BertjeConti
E21 Mad
Posts: 2749
Joined: Mon Nov 04, 2013 9:49 pm
My E21(s): E12 520-6
Location: nederland , Weert

Re: E12 Solex 4A1

Post by BertjeConti »

Sounds like the typical Solex 4A1 problems.

There is a vac. controlled system assisting the throttle when the engine is stalling, perhaps this isn't working fast enough anymore.

And about the second stage, probably a warped carburettor top, or also vac problems.
Second stage is also vac controlled and has a thermo switch which prevents engaging second stage if the engine isn't fully warmed up.
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Megasquirted '77 E12 520-6

Aspen Silver '96 E39 523i
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