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Home > General (L494) > Slow speed chugging/misfiring on 3.0 SDV6 2014 A/B RRS

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ali5711

Member Since: 04 Jan 2016
Location: notts
Posts: 36

Slow speed chugging/misfiring on 3.0 SDV6 2014 A/B RRS

Had 3 occasions in last 2 days at steady 30 and 40 mph in auto and the drive is chugging/misfiring but no alarm fault evident. It is fine at higher speeds and accelerating. Any ideas thanks B4 I trouble LRA?

Thu Aug 04 2016 3:54pm

ali5711

Member Since: 04 Jan 2016
Location: notts
Posts: 36

It is not misfiring but auto gear changing up/down and back with steady throttle at 40mph, maybe a control system point with low load?

Mon Sep 05 2016 6:25pm

wilf

Member Since: 08 Nov 2012
Location: on the naughty step
Posts: 939

See if it does it in "S". MY2016 HSE D SDV6 - gone due to fuel dilution problems.

By the age of 50 you have the face you deserve - George Orwell.

Mon Sep 05 2016 7:29pm

ali5711

Member Since: 04 Jan 2016
Location: notts
Posts: 36

will do tonight.

Tue Sep 06 2016 4:34pm

PauloAmore

Member Since: 27 Jan 2007
Location: Bonnie Scotland
Posts: 1292

Mine did that.

Fix was; remove the Petrol from the diesel tank.
- and replace £9k of stuff. 2022 P440e AB

Tue Sep 06 2016 5:10pm

ali5711

Member Since: 04 Jan 2016
Location: notts
Posts: 36

No petrol in thankfully, although I have had suspect fills of diesel quality.
In Sport it does not happen, only in auto under min load and steady speed around 40 mph - must be hunting in the auto gear change point?

Fri Sep 09 2016 5:36am

wilf

Member Since: 08 Nov 2012
Location: on the naughty step
Posts: 939

Could be that being in Sport stops the 'box going into too high a gear - I find mine tries to do that on occasion, and then I get the driveline vibration/shunting as if I as in manual car in top at 15mph.

Well, OK, maybe not quite that bad, but the same issue at it's root.

So, maybe the next time yours does it, paddle it down a gear and see if it clears? MY2016 HSE D SDV6 - gone due to fuel dilution problems.

By the age of 50 you have the face you deserve - George Orwell.

Fri Sep 09 2016 7:01am

ali5711

Member Since: 04 Jan 2016
Location: notts
Posts: 36

Will do thanks Wilf

Fri Sep 09 2016 8:15am

wilf

Member Since: 08 Nov 2012
Location: on the naughty step
Posts: 939

Another lead for you. Saw a very similar problem on a jag forum (same engine and gearbox). Problem lay in a faulty brake pedal switch. Worth getting that checked out. MY2016 HSE D SDV6 - gone due to fuel dilution problems.

By the age of 50 you have the face you deserve - George Orwell.

Thu Sep 15 2016 12:31pm

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