My Passat 1.8T 20 valve turbo had this problem. The throttle body is caked with hardened oil residue which stops the throttle plate closing correctly affecting air flow and confusing the ECU. Just clean inside the throttle and the throttle plate with a clean lint free rag using WD40 and lightly spray the throttle spindle/bush on either side.
My Passat 1.8T 20 valve turbo had this problem. The throttle body is caked with hardened oil residue which stops the throttle plate closing correctly affecting air flow and confusing the ECU. Just clean inside the throttle and the throttle plate with a clean lint free rag using WD40 and lightly spray the throttle spindle/bush on either side.
residue.
clintcoza 2 months ago
Correct its a bad iac valve and you can't just swap that out. You have to get a different throttle body
ahhbee23 2 months ago
idle air control valve or air leak.
jamie211983 2 months ago
Throttle body bad....
gti150 3 months ago
could be the air bo plugs . it happend on mine and one was loose i put it bk on and it run fine
cwtrehill 10 months ago
did you ever figure out what caused this?
I have a similar problem
mazetechsystems 10 months ago
@mazetechsystems Not really but in the description you can see what I did to fix it...
madsipuli 10 months ago
@mazetechsystems most likely the MAF (Mass Air Flow) just clean it if you haven't already.
Evolancer276 9 months ago