A warning.

sjc · 11th February 2012, 18:46

I've copied and pasted this from the tech section about what happened today, please be aware while it's below freezing...

WARNING !
OK. Guys thanks for this thread, as I've had that exact problem today, and although I dealt with it easily enough, it would not have been good if someone else was driving, unaware of what was happening.
Started car, temp showing minus 3 degrees. After a couple of miles the temp went down to -5 and then quickly to -8, and we were on a Motorway and set Cruise to which may or may not have been something over 70 leptons.Nice quiet road, no dramas until a car pulled out in the distance so I touched the brakes and the Cruise lights duly went out. Still all fine, until I realised that the car has stayed at the speed and is now driving it self! No amount of pedal playing would free it, but using brakes would slow the car, but not seemingly the revs! As it was a Motorway, and felt I had a bit of control, I carried on until it became a duel carriageway and was able to pull over in a layby.Slowing to a halt, with my foot hard on the brakes, it was obvious that the car was still trying to pull forward,I put it in neutral( it's an Auto) and the revs were stuck at 4000rpm.With my foot hard still on teh brake, I put it in park,and turned teh ignition off. Restarted a couple of times and it was still stuck at 4000rpm, and no amount of blipping the throttle would do it. Flipped the bonnet, and played with the throttle manually, and after a couple of attempts it freed itself, ideld a bit lumpy for a few seconds and then fine.Continued the journey not going over 2500 revs and all fine, as was the same journey on the way back, again keeping the revs at sensible levels.
Looking at the number of occurences,there seems to be a link between anything colder than -5 degrees below and the throttle sticking?
Please all of you, be very careful, it's not a pleasant experience

blacknwhite · 11th February 2012, 18:53

I'm sorry, but that is really hard work trying to read AND understand that. I've tried twice.

marley · 11th February 2012, 18:54

Ooh! Sounds scarey! I wont be using my cruise, if its minus then! Thanks for that!

Leyland Worldmaster · 11th February 2012, 18:59

Quote:

Originally Posted by blacknwhite

I'm sorry, but that is really hard work trying to read AND understand that. I've tried twice.

V6 engines suffer from sticking throttles in cold weather beware...

stocktake · 11th February 2012, 19:36

Quote:

Originally Posted by leopard680

V6 engines suffer from sticking throttles in cold weather beware...

They only suffer it there is a problem with the way the engine breathes, this is now well documented on how to ensure the breather system is in good condition.

http://www.the75andztclub.co.uk/foru...d.php?t=104108

2Diesels · 11th February 2012, 19:55

Most car handbooks discourage the use of cruise control in wintery or very wet conditions as it can be very dangerous, I find cruise very scary at the best of times & generally only use it for keeping at the right speed through long stretches of roadworks or where the speed limit is difficult to adhere to

oggy · 11th February 2012, 20:20

My cruise control works fine in all temperature ranges,never had a problem. Then again it is my right foot.

Brabus · 11th February 2012, 20:20

Quote:

Originally Posted by 2Diesels

Most car handbooks discourage the use of cruise control in wintery or very wet conditions as it can be very dangerous, I find cruise very scary at the best of times & generally only use it for keeping at the right speed through long stretches of roadworks or where the speed limit is difficult to adhere to

As above,I do the same.Generally I just use me foot.But its a good warning.

FLYER · 11th February 2012, 20:23

That sounds very scary , thank the lord i dont have cruise .

Tim_Burgess · 11th February 2012, 20:31

Quote:

Originally Posted by 2Diesels

Most car handbooks discourage the use of cruise control in wintery or very wet conditions as it can be very dangerous, I find cruise very scary at the best of times & generally only use it for keeping at the right speed through long stretches of roadworks or where the speed limit is difficult to adhere to

Don't have cruise now, but when I did I generally only used it to keep legal in stretches of camera-infested roadworks.

11th February 2012, 18:46	#1
sjc Posted a thing or two MG ZT-T 180 Sports +, 2007 completely restored XJ 4.2 LWB Sovereign,Noble M400,LR Discovery 3 Join Date: Dec 2009 Location: Little Baddow Posts: 1,315 Thanks: 65 Thanked 148 Times in 70 Posts	A warning. I've copied and pasted this from the tech section about what happened today, please be aware while it's below freezing... WARNING ! OK. Guys thanks for this thread, as I've had that exact problem today, and although I dealt with it easily enough, it would not have been good if someone else was driving, unaware of what was happening. Started car, temp showing minus 3 degrees. After a couple of miles the temp went down to -5 and then quickly to -8, and we were on a Motorway and set Cruise to which may or may not have been something over 70 leptons.Nice quiet road, no dramas until a car pulled out in the distance so I touched the brakes and the Cruise lights duly went out. Still all fine, until I realised that the car has stayed at the speed and is now driving it self! No amount of pedal playing would free it, but using brakes would slow the car, but not seemingly the revs! As it was a Motorway, and felt I had a bit of control, I carried on until it became a duel carriageway and was able to pull over in a layby.Slowing to a halt, with my foot hard on the brakes, it was obvious that the car was still trying to pull forward,I put it in neutral( it's an Auto) and the revs were stuck at 4000rpm.With my foot hard still on teh brake, I put it in park,and turned teh ignition off. Restarted a couple of times and it was still stuck at 4000rpm, and no amount of blipping the throttle would do it. Flipped the bonnet, and played with the throttle manually, and after a couple of attempts it freed itself, ideld a bit lumpy for a few seconds and then fine.Continued the journey not going over 2500 revs and all fine, as was the same journey on the way back, again keeping the revs at sensible levels. Looking at the number of occurences,there seems to be a link between anything colder than -5 degrees below and the throttle sticking? Please all of you, be very careful, it's not a pleasant experience __________________ The 75... " It's lovely isn't it ? Makes you wonder why people are obsessed with modern rubbish". Tiff Needell

11th February 2012, 18:53	#2
blacknwhite Posted a thing or two Black Rover 75 Connie CDT and Twilight Chromactive ZT Turbo Join Date: Jun 2011 Location: Newcastle upon Tyne Posts: 1,602 Thanks: 15 Thanked 16 Times in 7 Posts	I'm sorry, but that is really hard work trying to read AND understand that. I've tried twice.

11th February 2012, 18:54	#3
marley Avid contributor rover 75 cdti. conn. s.e. Join Date: Jul 2009 Location: pontypridd Posts: 241 Thanks: 0 Thanked 1 Time in 1 Post	Ooh! Sounds scarey! I wont be using my cruise, if its minus then! Thanks for that!

11th February 2012, 19:55	#6
2Diesels Trader ZT 260SE, Connoisseur CDT Join Date: Mar 2009 Location: The Ancient Shire Of Bedlington Posts: 12,597 Thanks: 68 Thanked 506 Times in 305 Posts	Most car handbooks discourage the use of cruise control in wintery or very wet conditions as it can be very dangerous, I find cruise very scary at the best of times & generally only use it for keeping at the right speed through long stretches of roadworks or where the speed limit is difficult to adhere to

11th February 2012, 20:20	#7
oggy Regular poster Rover 75 Join Date: Oct 2009 Location: ipswich Posts: 81 Thanks: 6 Thanked 0 Times in 0 Posts	My cruise control works fine in all temperature ranges,never had a problem. Then again it is my right foot.

11th February 2012, 20:23	#9
FLYER Banned rover75 cdti AUTO TOURER 160 bhp. Join Date: Jul 2010 Location: Glasgow Posts: 35,346 Thanks: 2,985 Thanked 3,685 Times in 2,463 Posts	That sounds very scary , thank the lord i dont have cruise .