Unstable acceleration at specific car speed

Hi Jun,
seems someone has made a bore through the cap to inject some grease or other fluid.

This is false. The TPS has to be kept clean anf dry, 
Because of the very low electrical current any fluid or oil will lead to misfunction.

Regards
Norbert

Hi, Norbert, 

Thank you for your advice.
I understood !1


Many thanks,

JUN

Hello Dr. D-Jet,

According to your advice I drove with TPS unconnected.

Engine start. First 3 minutes it was no problem with his idling. After that "Hunting" start. (Engine RPM is up and down and repeat it).
Normally most of time my car has this kind of Hunting at idling, but this time it was more bigger.

The Hunting was bigger and bigger and finally Engine stalled.
Just before the Engine stall, I confirmed that the push rod of the AT kick valve (in the picture) pushed throttle valve lever with a big stroke and back to standard position. Go and back repeated and finally, Engine stalled itself. I couldn't drive out,

I connected TPS again and Engine idling back to normal although small "Hunting" was there.
Today I replaced 4 injectors with new ones but the subjected problem still occurred. (Especially at staring of accelerating from idling, there is some flat spots)  

From this fact, if you could advise me what is the possible root cause it would be highly appreciated.


Best Regards,


JUN 

Hi Jun,
what you call 'AT kick valve' is called 'Drehzahlregler' in German. This means 'Speed controller' in English.
Following the manual, you have to adjust idle speed there.

Did you try to correct the idle by adjusting the screw / nut M5 at the rod?
There is a specific adjustment procedure for earlier and later engines.
Do you have all this information?

Regards
Norbert

Hello Norebert,

Thank you for your advice.
The attached information is the all I have.
Once I tried to do it and did it but I am not sure if it was correctly adjusted or not.
This time I really want to adjust it correctly.
If you could share further information it would be highly appreciated.
 

Best Regards,

JUN
 

Hi JUN,
I'm sorry I don't have any further information.
The information you have in English is the same I have in German.

Regards
Norbert