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If i have the gearbox in neutral and try to keep the engine on a steady RPM, let´s say 3000rpm,s it is totally impossible. The engine wanders between 2600rpm-3400rpm, and it is the same on any given rpm. Idle is steady as a rock at 850rpm and there is nothing to be noticed when driving. The car is due it´s MOT soon and part of the swedish MOT test is the CO emissions at 2500rpm. I suppose they will have a hard time doing it with this issue. Anyone got a clue what i should check?
Throttle position switch/potentiometer and MAF information
For starters, check the pins and their cleanliness (and position) on your mass air flow (MAF) sensor and throttle position switches, as per these two posts:
The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
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Might not be them but start there to eliminate the "usual suspects".
Might also be an air leak in one of your air box to turbo or turbo to throttle body hoses.
You're welcome. I appreciate the positive feedback.
I have posted the links below up before but just as a reminder, there is lots of C4 UrS info (lots of which translates in some form to the S2 and RS2) at these two posts (Remember to scroll down below their diagrams to their respective hyperlinks):
The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
just had a very similar issue on my 200q with a 3b conversion, having replaced the white 2 pin at the back of the head it may have been the wiring to the sensor, i have re made the connections and all seems good , this is after vag com , no codes, only an highlighted aux air valve connection , but i rec it was adapting the poor 2 pin signal
good luck
chris
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