I hope you can keep helping me. My sweet guy's bitching and I'm starting to despair.
First of all, the data. It is a 100 C4 S4 with a 4.2l ABH engine. Year of construction 93.
Symptoms: There is a significant lack of performance. Wave-like acceleration. He usually takes the gas very late or goes down to his knees until he goes out. If I want to drive constantly with the same speed it will slow down and accelerate again etc.
In the stand gas he also orders from 400-900 revolutions up and down.
So I went through this and tested myself.
When I put out The Lambda, I didn't have any change.
So let the nice next to and read out.
LMM was shown to be too low a signal and Lamda regulates sporadic.
So the Lamda I had tried unsuccessfully so I bought and exchanged a new LMM. No change .
Since the latest he runs only when I take out the Lmm but continues with the above symptoms and he goes out in the stand gas lansam . When the LMM is plugged in, it dies immediately after launch. And since I've disconnected the battery, my speedometer has failed. The speed and the odometer do not move any more. The security is all right.
I suspect my ECU dies and hope for something easier
.I'll thank you in advance.
Greetings Timo
