Diesel 75 auto driving a bit odd

Rick-sta · 16th December 2016, 20:13

Hi all,

Over the last couple of weeks my dad's mentioned a few times that his 75 diesel auto has become a little less responsive and a bit hesitant. Today I took it out and have also noticed the same thing. It seems to want to shift down a gear a lot of the time now whereas before it would stay in the same gear unless you really put your foot down. It also like to hesitate for about a 1 to 2 seconds deciding whether it should shift down a gear or two or not.

Power wise it feels fine, but just not as quick at responding as it used to be.

anyone had anything similar on theirs and came across a solution?

gozo ken · 16th December 2016, 20:19

If it were me.I'd try unplugging the MAF sensor temporally and see if there's a difference.
Also try the sports/normal/snow switch in each mode,my friends SLK had become disconnected and was in one mode,until reconnected,,although on the Rover this should revert to 'normal'.
Ken.

Stickman · 16th December 2016, 20:28

I'd agree with ken ref the maf rick
I recently had the pleasure of assistance from mike noc who plugged his box of tricks into my car
His reader said the maf sensor reading was on the low side
I had noticed the car was a bit slow and hesitant to accelerate
I had a spare maf which I duly fitted
Upon which I have pleasure to report an immediate improvement
Regards
Chris

Mike24 · 16th December 2016, 22:24

If unplugging the MAF doesn't do the trick you could try checking the intercooler for leaking joints and cracks. I had a similar situation a couple of months ago with the car changing down on gentle slopes and then up again. Another symptom was smoke under hard acceleration, the problem turned out to be a crack in the plastic endcap of the intercooler radiator. Once replaced the the car seemed to pull better and no longer changed down unnecessarily. Made a huge difference to the feel of the car.

Pete · 16th December 2016, 23:07

Has the transmission fluid been changed? If it's old and tired then it can affect gear changes.

t5tart · 16th December 2016, 23:21

Quote:

Originally Posted by Pete

Has the transmission fluid been changed? If it's old and tired then it can affect gear changes.

I was just going to ask the same

16th December 2016, 20:13	#1
Rick-sta This is my second home MG ZT 2.0 CDTI+ in Typhoon, MG TF 135 in Typhoon & Rover 75 Connoisseur CDTI SE in Pearl Black Join Date: Oct 2012 Location: Norfolk Posts: 7,534 Thanks: 2,718 Thanked 2,827 Times in 1,462 Posts	Diesel 75 auto driving a bit odd Hi all, Over the last couple of weeks my dad's mentioned a few times that his 75 diesel auto has become a little less responsive and a bit hesitant. Today I took it out and have also noticed the same thing. It seems to want to shift down a gear a lot of the time now whereas before it would stay in the same gear unless you really put your foot down. It also like to hesitate for about a 1 to 2 seconds deciding whether it should shift down a gear or two or not. Power wise it feels fine, but just not as quick at responding as it used to be. anyone had anything similar on theirs and came across a solution? __________________ How to retrofit Cruise Control on a diesel with no OEM wiring in place: Link How to retrofit heated electric memory seats with no OEM wiring in place: Link How to operate FBH and ATC via text Link How to restore cloudy projector headlights Link

16th December 2016, 23:07	#5
Pete Owners Club Director Rover 75 Join Date: Oct 2006 Location: Sherfield-on-Loddon Posts: 4,872 Thanks: 137 Thanked 996 Times in 444 Posts	Has the transmission fluid been changed? If it's old and tired then it can affect gear changes. __________________ Follow The Club On Twitter

16th December 2016, 20:19	#2
gozo ken Avid contributor R75 SALOON Join Date: Feb 2013 Location: Lincolnshire Posts: 226 Thanks: 20 Thanked 57 Times in 44 Posts	If it were me.I'd try unplugging the MAF sensor temporally and see if there's a difference. Also try the sports/normal/snow switch in each mode,my friends SLK had become disconnected and was in one mode,until reconnected,,although on the Rover this should revert to 'normal'. Ken.

16th December 2016, 20:28	#3
Stickman Posted a thing or two Rover 75 saloon Join Date: Nov 2012 Location: Bordon Posts: 1,856 Thanks: 250 Thanked 403 Times in 352 Posts	I'd agree with ken ref the maf rick I recently had the pleasure of assistance from mike noc who plugged his box of tricks into my car His reader said the maf sensor reading was on the low side I had noticed the car was a bit slow and hesitant to accelerate I had a spare maf which I duly fitted Upon which I have pleasure to report an immediate improvement Regards Chris

16th December 2016, 22:24	#4
Mike24 Loves to post Rover 75 CDTI Auto Saloon Connoisseur SE Join Date: Apr 2015 Location: Coventry Posts: 358 Thanks: 166 Thanked 67 Times in 56 Posts	If unplugging the MAF doesn't do the trick you could try checking the intercooler for leaking joints and cracks. I had a similar situation a couple of months ago with the car changing down on gentle slopes and then up again. Another symptom was smoke under hard acceleration, the problem turned out to be a crack in the plastic endcap of the intercooler radiator. Once replaced the the car seemed to pull better and no longer changed down unnecessarily. Made a huge difference to the feel of the car.