Rs4 b9 issue

2.9 V6 24v TFSI - 444 bhp
Smara
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Rs4 b9 issue

Post by Smara » Sat Jun 30, 2018 10:37 am

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
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Re: Rs4 b9 issue

Post by Terminator_X » Sat Jun 30, 2018 12:10 pm

Nope not on mine now 5k in.

TX.

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KiwiRS4driver
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Re: Rs4 b9 issue

Post by KiwiRS4driver » Sat Jun 30, 2018 1:29 pm

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.
_____________________________________________
2018 B9 RS4
2016 Range Rover Sport 3.0 HSE
2015 B8 RS4 (gone)
2014 Mini Cooper S (gone)
2012 Mini Cooper S (gone)

Smara
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Re: Rs4 b9 issue

Post by Smara » Sat Jun 30, 2018 3:47 pm

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
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Re: Rs4 b9 issue

Post by Markp » Sun Jul 01, 2018 7:33 am

Is it the fuel saving coast function?

Smara
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Re: Rs4 b9 issue

Post by Smara » Sun Jul 01, 2018 8:21 am

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

Markp
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Re: Rs4 b9 issue

Post by Markp » Sun Jul 01, 2018 10:30 am

Smara wrote:
Sun Jul 01, 2018 8:21 am
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
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Re: Rs4 b9 issue

Post by Smara » Sun Jul 01, 2018 7:09 pm

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

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MikeFish
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Re: Rs4 b9 issue

Post by MikeFish » Sun Jul 01, 2018 7:16 pm

Does this engine have the cylinder on demand function?
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graeme4130
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Re: Rs4 b9 issue

Post by graeme4130 » Sun Jul 01, 2018 7:19 pm

I don't get that on mine, and its 3.5k miles in
Saying that, it's pretty rare I sit at 80mph ;)
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Smara
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Re: Rs4 b9 issue

Post by Smara » Sun Jul 01, 2018 7:26 pm

graeme4130 wrote:
Sun Jul 01, 2018 7:19 pm
I don't get that on mine, and its 3.5k miles in
Saying that, it's pretty rare I sit at 80mph ;)
8) 8)

Smara
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Re: Rs4 b9 issue

Post by Smara » Sun Jul 01, 2018 7:27 pm

MikeFish wrote:
Sun Jul 01, 2018 7:16 pm
Does this engine have the cylinder on demand function?
I don’t think so

PieterZ
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Re: Rs4 b9 issue

Post by PieterZ » Sun Jul 01, 2018 8:23 pm

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.
All black B9 RS4

Smara
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Re: Rs4 b9 issue

Post by Smara » Sun Jul 01, 2018 8:24 pm

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

Markp
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Re: Rs4 b9 issue

Post by Markp » Mon Jul 02, 2018 7:33 pm

Smara wrote:
Sun Jul 01, 2018 7:09 pm
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.

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