Rs4 b9 issue

[Smara]

Hi,

I have an Rs4 b9 with 1500 miles. Yesterday for the second time I experienced the following:

When travelling in the motorway in high gear between 2000 and 3000 rpm constant speed (with or without the speed limiter) the car every 20-30 seconds loses speed for a couple of seconds). It is barely noticeable but you can feel it. As a proof when setting the speed limiter, say at 80 mil/hr and watching the instant fuel consumpion indicator, you can see that when that happpens the ecu compensates the decrease in power with some more power. That happened twice after many min les after start. I still haven’t checked with Audi dealer.

Does anybody has had similar experience?

Thank you very much for you answer,

Andrew

[Terminator_X]

Nope not on mine now 5k in.

TX.

Sent from my BBB100-2 using Tapatalk

[KiwiRS4driver]

I’ve not had this either, and I’ve done quite a bit of driving up and down a new stretch of motorway at around 120km/h both with and without cruise control. It’s smooth as a baby’s bum so I’d definitely notice if there were little blips like you’re experiencing. You say it happens with our without cruise control on, so it’s not the adaptive cruise kicking in then (I recently discovered the adaptive cruise won’t let you go past traffic if you are on the outside (slow) lane and some moron is sitting in the fast lane). Back to the dealer I say. Sounds like an electronic gremlin of some kind.

[Smara]

Will do hoping in a easy solution. I’ve read in some forums problems with the torque converter, but signs seem to be slightly different. Will keep you posted

[Markp]

Is it the fuel saving coast function?

[Smara]

It doesn’t sound like, as this function operates when removing power (decelerating) and not at constant throttle.

[Markp]

It doesn’t sound like, as this function operates when removing power (decelerating) and not at constant throttle.

Coast works on lifting throttle (decelerating). Gearbox indicator changes too.

[Smara]

Isn’t coast the disengagement of the gearbox to save fuel ? Sorry maybe I got it wrong

[MikeFish]

Does this engine have the cylinder on demand function?

[Graeme4130]

I don't get that on mine, and its 3.5k miles in
Saying that, it's pretty rare I sit at 80mph

[Smara]

I don't get that on mine, and its 3.5k miles in
Saying that, it's pretty rare I sit at 80mph

[Smara]

Does this engine have the cylinder on demand function?

I don’t think so

[PieterZ]

Strange. What do you mean by losing speed?
Do you keep the throttle in the same position and it then drops in speed?
If so I never noticed this in mine if that helps. I have almost 5k km now.

[Smara]

As if it was a misfire for one or two seconds, barely noticeable but you can feel it.

[Markp]

Isn’t coast the disengagement of the gearbox to save fuel ? Sorry maybe I got it wrong

Yes - as you lift (decelerate) you sometimes get a momentary “cough” as it cuts in or out.
No COD on the 4 but occasional hesitation common on 6 when COD cuts in and out.