Does this sound right...?

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Does this sound right...? #1538817 21/05/2015 21:41 21/05/2015 21:41
B Batty Unregistered
Batty Unregistered B	Evening all I know this has been covered quite alot but thought would just seek some opinions.... My x reg 20v turbo returning around 23mpg... That's a 30 mile commute, half A road and motorway and half stop and start but NEVER thrashed, sad I know! Reason I ask is temp gauge...for first 8 miles of commute lovely open flowing roads but the gauge doesn't even move. Once idling hovers around 60 ish. If left stood rises eventually to 90 ish, once driving again and moving it drops back towards 60. I hear constantly on here about dodgy thermostats causing bad mpg, does this sound like the case here or just standard coupe idiosyncrasy?! Thanks

Re: Does this sound right...? [Re: ] #1538818 21/05/2015 21:46 21/05/2015 21:46
Joined: Apr 2009 Posts: 2,719 My name is Daniel Burbum123 club member 1891
Burbum123 club member 1891 I need some sleep Joined: Apr 2009 Posts: 2,719 My name is Daniel	Sounds like a failing thermostat to me !

Re: Does this sound right...? [Re: ] #1538819 21/05/2015 21:47 21/05/2015 21:47
G glenn1960 Unregistered
glenn1960 Unregistered G	temp gauge seems ok, up to 90 if in traffic, 60 otherwise. Unsure what mileage you should get from a 20v though, aint got one ! [ yet ]

Re: Does this sound right...? [Re: ] #1538820 21/05/2015 21:53 21/05/2015 21:53
Joined: Feb 2012 Posts: 735 Yorks (near Rhubarb Triangle) Robotrish Enjoying the ride
Robotrish Enjoying the ride Joined: Feb 2012 Posts: 735 Yorks (near Rhubarb Triangle)	Could be Coupe paranoia ! Which is quite normal

Re: Does this sound right...? [Re: ] #1538821 21/05/2015 21:55 21/05/2015 21:55
B Batty Unregistered
Batty Unregistered B	Mpg seems very low bearing in mind I never drive it as they should be driven simply because of the current mpg. I was considering a fc mapping, but if themo is no good then no real point. Apart from that I'm well happy, been off the road for over two years, had full service etc and running lovely. Maybe its just a thirsty coup!!

Re: Does this sound right...? [Re: ] #1538824 21/05/2015 21:59 21/05/2015 21:59
Joined: Apr 2009 Posts: 2,719 My name is Daniel Burbum123 club member 1891
Burbum123 club member 1891 I need some sleep Joined: Apr 2009 Posts: 2,719 My name is Daniel	Rough mpg ?? Coupes are thirsty

Re: Does this sound right...? [Re: ] #1538825 21/05/2015 22:00 21/05/2015 22:00
B Batty Unregistered
Batty Unregistered B	23...

Re: Does this sound right...? [Re: ] #1538827 21/05/2015 22:30 21/05/2015 22:30
Joined: Apr 2009 Posts: 2,719 My name is Daniel Burbum123 club member 1891
Burbum123 club member 1891 I need some sleep Joined: Apr 2009 Posts: 2,719 My name is Daniel	Not much below average but low mph could be a lot of things thermostat as you say , spark plugs , a good service , have you taken the plugs out and checked the colour of them ? Last edited by Burbum123; 21/05/2015 22:31.

Re: Does this sound right...? [Re: ] #1538829 21/05/2015 22:49 21/05/2015 22:49
Joined: Aug 2007 Posts: 8,057 Southsea G Gunzi Club member 189, Former Club President
Gunzi Club member 189, Former Club President Je suis un Coupé G Joined: Aug 2007 Posts: 8,057 Southsea	The thermostat has failed, and needs replacing as it's stuck open, a common 20vt fault. It's worth doing the temperature sensor at the same time. The simple test is start the car from cold and place you hand on the large pipe coming out of the top right hand corner of the radiator which leads to the thermostat. If it warms up slowly the stat is stuck open and needs replacing, this explains what you see on the dials while driving. If it stays cold then suddenly gets hot the stat is ok.

Re: Does this sound right...? [Re: Gunzi] #1538833 21/05/2015 23:01 21/05/2015 23:01
Joined: Oct 2012 Posts: 836 Hereford H HiraethHuw Enjoying the ride
HiraethHuw Enjoying the ride H Joined: Oct 2012 Posts: 836 Hereford	As above ^^ - change the thermostat. Sounds exactly like my n/a when I bought it. It's a different car now it's been changed. Also, have you changed the CHOD - coolant hose of death? This connects onto the back of the 'stat then runs around the back of the engine - another common failure point but can be terminal to the engine if it fails and you lose your coolant. Mozza has his fail after the garage changed his thermostat - have you seen his post ? And then get it to FC performance Last edited by HiraethHuw; 21/05/2015 23:05.

Re: Does this sound right...? [Re: ] #1538840 21/05/2015 23:42 21/05/2015 23:42
B Batty Unregistered
Batty Unregistered B	Cheers everyone.

Re: Does this sound right...? [Re: ] #1538848 22/05/2015 07:37 22/05/2015 07:37
Joined: Dec 2005 Posts: 33,568 Berlin barnacle Club Member 18 - ex-Minister without Portfolio
barnacle Club Member 18 - ex-Minister without Portfolio Forum Demigod Joined: Dec 2005 Posts: 33,568 Berlin	Getting the temperature to the right place will almost certainly improve your mileage since the engine won't think it's still warming up. You should see an indicated 70-80C (84C actual) when cruising, rising 15C or so when in traffic - that's controlled by the fans, since the stat is wide open by then. The gauge always reads a little low. Don't get no respect! Coupe Fiat 1994-2000 - an owner's guide <-- clicky!

Re: Does this sound right...? [Re: barnacle] #1538851 22/05/2015 11:45 22/05/2015 11:45
Joined: Dec 2005 Posts: 2,330 Leeds phil_20VT Competition Level
phil_20VT Competition Level Joined: Dec 2005 Posts: 2,330 Leeds	23 mpg is a little low for the type of driving you are doing but not out of the ordinary. The new stat might improve it slightly. I found the best solution for worry about the low mpg was to stop monitoring it.

Re: Does this sound right...? [Re: ] #1538855 22/05/2015 12:13 22/05/2015 12:13
Joined: Mar 2007 Posts: 16,834 Auld Reekie Edinburgh Club President, member225
Edinburgh Club President, member225 Forum veteran Joined: Mar 2007 Posts: 16,834 Auld Reekie	Originally Posted By: Batty Evening all I know this has been covered quite alot but thought would just seek some opinions.... My x reg 20v turbo returning around 23mpg... That's a 30 mile commute, half A road and motorway and half stop and start but NEVER thrashed, sad I know! Reason I ask is temp gauge...for first 8 miles of commute lovely open flowing roads but the gauge doesn't even move. Once idling hovers around 60 ish. If left stood rises eventually to 90 ish, once driving again and moving it drops back towards 60. I hear constantly on here about dodgy thermostats causing bad mpg, does this sound like the case here or just standard coupe idiosyncrasy?! Thanks I get 22/23 mpg driving around town mostly, sometimes under in the winter. That works out to about 5 miles per litre. On a smooth run I get 7+ mpl which equates to about 32/33 mpg. From your description of the route it does sound low and as said a properly working stat will help fuel economy. BumbleBee carer

Re: Does this sound right...? [Re: ] #1538856 22/05/2015 12:35 22/05/2015 12:35
Joined: Dec 2005 Posts: 17,367 Staffordshire Nigel Forum veteran
Nigel Forum veteran Joined: Dec 2005 Posts: 17,367 Staffordshire	60 degrees on the move is definitely too low - should be mid-80s (80-ish on the gauge) new thermostat will make quite a bit of difference

Re: Does this sound right...? [Re: ] #1538910 23/05/2015 01:19 23/05/2015 01:19
S Slugcatcher1 Unregistered
Slugcatcher1 Unregistered S	Had exactly the same temp reading myself and after changing the thermostat the gauge now sits around 78 degrees and of course goes up in traffic. I do a 36 mile commute but with a heavy foot, and average 23 to 24 mpg. If I drive like a nun I get 30 mpg. I reckon your mpg is about right due to the stop start side of things.

Re: Does this sound right...? [Re: ] #1538924 23/05/2015 09:26 23/05/2015 09:26
P Pondman Unregistered
Pondman Unregistered P	My usual mantra: If you change the thermostat, change the CHOD at the same time. Issues usually occur if not!

Re: Does this sound right...? [Re: ] #1538926 23/05/2015 09:40 23/05/2015 09:40
Joined: Mar 2007 Posts: 16,834 Auld Reekie Edinburgh Club President, member225
Edinburgh Club President, member225 Forum veteran Joined: Mar 2007 Posts: 16,834 Auld Reekie	Originally Posted By: Pondman My usual mantra: If you change the thermostat, change the CHOD at the same time. Issues usually occur if not! Sometimes stats are only lasting 2 years or so! BumbleBee carer

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