I have a late year 2000 S4 Avant.
Shortly after buying it I took it to Kim Collins for a 300bhp chip and a Miltek cat back exhaust.
The upgrade made an immediate improvement, and the car went fairly well.
Recently it has started to be very sluggish with minimal boost in the gears. I took it back to Kim who changed the airflow meter - no effect, then changed the lambda probes - also no effect.
He agreed performance was flat and the VAG box he uses to plug into the car showed (i think only one) cyl bank running weak.
Changing the lamda probes mde a short term difference, but today I have discovered that disonnecting and reconnecting the battery restores full performance for about 40 miles or so before it starts to drop off again.
So I guess the fault is somthing to do with the learning ability of the closed loop ECU, but I know little about the ignition and control managment on an S4 or any other modern turbo car.
My first question is: HAs anyone else experienced this and what could be wrong...????
My second question is: Does anyone know of a way to reset the ECU to the default map? (I read on a US site that if you leave the ign on for 3 minutes it resets the map to default - is this true and should it be doen hot or cold?
Thx in advance - help greatly appreciated.
AW
Shortly after buying it I took it to Kim Collins for a 300bhp chip and a Miltek cat back exhaust.
The upgrade made an immediate improvement, and the car went fairly well.
Recently it has started to be very sluggish with minimal boost in the gears. I took it back to Kim who changed the airflow meter - no effect, then changed the lambda probes - also no effect.
He agreed performance was flat and the VAG box he uses to plug into the car showed (i think only one) cyl bank running weak.
Changing the lamda probes mde a short term difference, but today I have discovered that disonnecting and reconnecting the battery restores full performance for about 40 miles or so before it starts to drop off again.
So I guess the fault is somthing to do with the learning ability of the closed loop ECU, but I know little about the ignition and control managment on an S4 or any other modern turbo car.
My first question is: HAs anyone else experienced this and what could be wrong...????
My second question is: Does anyone know of a way to reset the ECU to the default map? (I read on a US site that if you leave the ign on for 3 minutes it resets the map to default - is this true and should it be doen hot or cold?
Thx in advance - help greatly appreciated.
AW