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9th January 2018, 08:50 | #1 |
Regular poster
MG ZT-T 190 Join Date: Dec 2017
Location: Manchester
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Does everyone else's cruise control "pump" on and off?
Hi there,
I've owned a 190 ZT-T for a little over a month now. Do all 75s/ZTs exhibit this obvious "pumping" behaviour on cruise control where the ECU applies power for a few seconds until it's slightly over speed, then comes off the power until it's slightly under and repeats like that endlessly? Is it just MG Rover's archaic cruise control, or is mine broken? Thanks. |
9th January 2018, 08:53 | #2 |
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Rover 75 CDTi Tourer Join Date: Aug 2011
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I can't say I've ever noticed that no. It doesn't sound right. On my car it's no different to the cruise on any other I've driven.
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9th January 2018, 09:01 | #3 | |
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MG ZT190, MG ZS TD, MGF VVC, R200 TD bubble, Austin A35 Join Date: May 2017
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Quote:
How frequent is the 'pulsing' ? |
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9th January 2018, 09:05 | #4 | |
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MG ZT-T 190 Join Date: Dec 2017
Location: Manchester
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Quote:
It's not moving up and down by 10 mph or anything like that, it's just quite clearly going up and down between probably 69mph and 71mph every 5 or 6 seconds and you can tell when it's pulling and when it's "resting" on a continuous cycle. |
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9th January 2018, 09:52 | #5 |
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75 Tourer CDTi Connie SE Join Date: Jun 2017
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Hi, I have a slightly older 75 but recently made great use of CC whilst driving to Norfolk from Scotland. Only noticed the increasing revs going up hills/reducing revs going downhill as already mentioned. No 'pumping' and it certainly made the journey very easy!! Good luck with solving your issue.
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My 75 Tourer CDTi was born Saturday, 21st June 2003 @ 09:50 My 75 was the 18,749th 75 Tourer to run off the production line, out of 27,407 It was the 195th 75 Tourer CDT Connoisseur SE (135) to be made out of 2,074 and the 1,789th 75 Tourer in Wedgewood Blue Metallic (code: JEL) to be made out of 1,871 Wedgewood Blue Metallic 75 Tourers |
9th January 2018, 10:08 | #6 |
I really should get out more.......
MG ZT-T 260 Join Date: Feb 2016
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My ZTT is perfect on cruise but as others have said I have felt the sensation you are talking about on other makes of cars, it is usually on Turbo cars especially if they have been tweaked.
The worse one I had was a Saab 9000 Aero, tweaked to about 300bhp and the cruise was almost unusable, below 60mph it was acceptable but anything above that and even passengers were complaining after a few miles. Does the Cruise get its speed input from the same source as the speedo on these cars? I know on some makes they use a different ABS Sensor for cruise than the speedo. |
9th January 2018, 10:14 | #7 | |
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Ford Join Date: Nov 2012
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Quote:
Someone willl correct me if that's wrong Nige |
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9th January 2018, 10:41 | #8 |
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2005 MG ZT & 1996 MGF Join Date: Dec 2017
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I've not noticed mine pulsating. Mine's quite smooth.
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9th January 2018, 13:41 | #9 |
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MG ZT Join Date: Sep 2015
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ZT Cruise Control
My ZT 180 Auto has factory fitted cruise which works very smoothly with no discernible "on/off" action that you describe. I would suspect there is something not quite right with yours.
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9th January 2018, 15:23 | #10 |
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Ex CDT Auto Join Date: Oct 2017
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No pulsing or pumping on mine.
Just the initial boost when going up a hill to keep up to set speed. No different to the merc I had previously. |
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