Instrument Trip niggle

skin77 · 3rd November 2007, 00:11

I don't know if this will be posted in the right place but I'm sure someone will move it PDQ if it isn't

Today I turned on my trip computer to display the tank range and it had gone up amazingly from about 255 to 1000 miles, I have just rechecked it after driving on and off today and it is now down to 502.

Does anyone have any idea why this may happen ? Is it a fluke that may not reappear ?

Only having had the car a week, I'm not worried, but I really don't want it to go back under warranty to be sorted as I'm really enjoying it !

Answers on a postcard !

John

JohnDotCom · 3rd November 2007, 00:26

After you reset Computer, the MPG and the range will be inaccurate for a short time, as it computes from distance travelled in Total at that time.
If you have a Diesel and the Performance Enhancing Boxes such as Rover Ron's Synergy these also give an over optimistic reading.
Just use it as a Guide.
I've often had 700MPG indicated after Reset and coasting down hill as an example,
if only that was true.

skin77 · 3rd November 2007, 00:34

Cheers JDC.

I haven't reset it, I just turned it on ! it was fine up to today !

Its the petrol with the leaden footed pilot model !

David3807 · 3rd November 2007, 07:46

Happens to mine every now and again.

Just pop a little more fuel into the tank and it should cure it.

I find the 'wishful thinking' reading usually happens if I have been a bit quick in turning the ignition key for the start.

skin77 · 3rd November 2007, 08:21

Ok David, cheers I'll try that.
One of my mates suggested that, he's had that problem in a vectra, so I'm wondering if its a sensor thing. Maybe I've been round a corner quickly or something !

David3807 · 3rd November 2007, 08:26

Is there any other way to take a corner in a 190 ??? :lol:

I think its more likely that the electrics on a 75/zt are not that quick and if you do something a bit quick they can get confused.

Thats why the battery off reboot can work on so many occasions.

r44712 · 5th November 2007, 13:32

Quote:

Originally Posted by skin77

Does anyone have any idea why this may happen ? Is it a fluke that may not reappear?

I wouldn't worry about it, sometimes it seems to get a bit confused. There have been four 75/ZTs in my family and only ever one (my 1.8T at the time) did this once and gave an indicated range of ~1200 miles. Obviously not true.

I think its just a combination of factors that lead upto the wrong result being displayed, the range meter from what I have seen seems to take into account economy (which is averaged over time), average speed, and possibly current speed.

rdholmes · 6th November 2007, 10:52

Only a minor thing but as long as you have your car radio code you should be fine disconnecting the battery.......as long as....

If you have sat nav then search the threads for how to power it down to stop it busting .

Your radio will keep your presets. I have disconnected on number of ocassions and mine is fine.

3rd November 2007, 00:11	#1
skin77 Avid contributor MG ZT-T 190+ Starlight Silver Commission No. 13590 Join Date: Sep 2007 Location: Egham Posts: 133 Thanks: 0 Thanked 0 Times in 0 Posts	Instrument Trip niggle I don't know if this will be posted in the right place but I'm sure someone will move it PDQ if it isn't Today I turned on my trip computer to display the tank range and it had gone up amazingly from about 255 to 1000 miles, I have just rechecked it after driving on and off today and it is now down to 502. Does anyone have any idea why this may happen ? Is it a fluke that may not reappear ? Only having had the car a week, I'm not worried, but I really don't want it to go back under warranty to be sorted as I'm really enjoying it ! Answers on a postcard ! John __________________ .......the wind changed didn't it !

3rd November 2007, 00:34	#3
skin77 Avid contributor MG ZT-T 190+ Starlight Silver Commission No. 13590 Join Date: Sep 2007 Location: Egham Posts: 133 Thanks: 0 Thanked 0 Times in 0 Posts	Cheers JDC. I haven't reset it, I just turned it on ! it was fine up to today ! Its the petrol with the leaden footed pilot model ! __________________ .......the wind changed didn't it !

3rd November 2007, 08:21	#5
skin77 Avid contributor MG ZT-T 190+ Starlight Silver Commission No. 13590 Join Date: Sep 2007 Location: Egham Posts: 133 Thanks: 0 Thanked 0 Times in 0 Posts	Ok David, cheers I'll try that. One of my mates suggested that, he's had that problem in a vectra, so I'm wondering if its a sensor thing. Maybe I've been round a corner quickly or something ! __________________ .......the wind changed didn't it !

6th November 2007, 10:52	#8
rdholmes Avid contributor Rover 75 1.8T Conn SE Join Date: Nov 2006 Location: Woodley Posts: 174 Thanks: 0 Thanked 0 Times in 0 Posts	Only a minor thing but as long as you have your car radio code you should be fine disconnecting the battery.......as long as.... If you have sat nav then search the threads for how to power it down to stop it busting . Your radio will keep your presets. I have disconnected on number of ocassions and mine is fine. __________________ [SIGPIC][/SIGPIC] Cheers Roy

3rd November 2007, 00:26	#2
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	After you reset Computer, the MPG and the range will be inaccurate for a short time, as it computes from distance travelled in Total at that time. If you have a Diesel and the Performance Enhancing Boxes such as Rover Ron's Synergy these also give an over optimistic reading. Just use it as a Guide. I've often had 700MPG indicated after Reset and coasting down hill as an example, if only that was true.

3rd November 2007, 07:46	#4
David3807 Posted a thing or two 2002 R75 Conn SE 2.5l Auto Tourer, 2001 R75 Conn SE 2.5 Auto Saloon Join Date: Nov 2006 Location: Gravesend Posts: 1,897 Thanks: 0 Thanked 2 Times in 2 Posts	Happens to mine every now and again. Just pop a little more fuel into the tank and it should cure it. I find the 'wishful thinking' reading usually happens if I have been a bit quick in turning the ignition key for the start.

3rd November 2007, 08:26	#6
David3807 Posted a thing or two 2002 R75 Conn SE 2.5l Auto Tourer, 2001 R75 Conn SE 2.5 Auto Saloon Join Date: Nov 2006 Location: Gravesend Posts: 1,897 Thanks: 0 Thanked 2 Times in 2 Posts	Is there any other way to take a corner in a 190 ??? :lol: I think its more likely that the electrics on a 75/zt are not that quick and if you do something a bit quick they can get confused. Thats why the battery off reboot can work on so many occasions.