2.0 auto using excessive fuel

volcol · Jan 13th, 2006, 06:58

Hi All
i have a 97 2.0i auto that appears to be using an excessive amount of fuel ,around town it has dropped to around 22mpg, it used to be around 28-30 but has recently started to use more,it has done 75k fully serviced new transmission fluid ,but it does seem to hang on to gears not changing into top untill about 3-3500 rpm is this normal? engine temp seems to be around 65-68 degrees oil temp around the same again would this be normal ? it has noticiably dropped during the recent very cold spells ,any help or advice would be greatly appreacited
Col

bigandquick · Jan 13th, 2006, 18:06

I have no experience of 40 series auto boxes, but can generalise.
Problems upshifting I have found usually result from incorrect trans fluid levels. Check yours as it has been changed recently. If it's overfull you need to drain some pronto. Follow the handbook for the correct way to check it.
Your engine temperature is too low. It should run at 80-90 degrees. This will be causing overfuelling, assuming 80-90 is what your gauge used to read and it's not a faulty gauge. If your gauge is reliable, change the thermostat. If the temp is still low, change the coolant temp sensor. In that order, cheapest first.
Let us know how you get on

Rooster · Jan 13th, 2006, 19:44

Think i agree it sounds like your thermostats stuck open and the cars not getting warm my old s40 used to run around 82 degrees under normal driving.

I would change thermostat and temp senser at same time as you need to take cover off that holds stat in place to replace sensor so while you do stat you might aswell put a senser in aswell for peace of mind.

I put a new stat and senser in mine last month 108k on clock cos engine warning light came on and said fault with sensor.

vjck_uk · Jan 13th, 2006, 21:35

the temp is way to low it should be around 90 ,mine was running at 85 and i put a new stat in .its now gone up 2 mpg contastantly

volcol · Jan 13th, 2006, 22:46

Many thanks to you all for replying ,it seems i need a new thermostat then in all fairness this was suggested to me on an earlier posting but i dismissed it because heater was ok ,i dont actually have a guage in mine just got a digital display multifunction thing ,and even on a very hard run temp doesnt go much over 70 ,is it a fairly easy job to replace

once again very many thanks to all took trouble to reply it is much appreciated
Col

volcol · Jan 15th, 2006, 13:56

Once again many thanks for advice i fitted a new thermostat yesterday at a total cost inc antifreeze of less than a tenner ,and on usual trip today average consumption is rising from the 22mpg i was getting up to around 24 and hopefully will keep climbing
Col

vjck_uk · Jan 16th, 2006, 11:12

if its still slow in changing up you havent by any chance got the sports switch on have you ?

Jan 13th, 2006, 06:58	#1
volcol Junior Member Last Online: Oct 28th, 2007 19:14 Join Date: Dec 2004 Location: bristol	2.0 auto using excessive fuel Hi All i have a 97 2.0i auto that appears to be using an excessive amount of fuel ,around town it has dropped to around 22mpg, it used to be around 28-30 but has recently started to use more,it has done 75k fully serviced new transmission fluid ,but it does seem to hang on to gears not changing into top untill about 3-3500 rpm is this normal? engine temp seems to be around 65-68 degrees oil temp around the same again would this be normal ? it has noticiably dropped during the recent very cold spells ,any help or advice would be greatly appreacited Col

Jan 13th, 2006, 18:06	#2
bigandquick Premier Member Last Online: Mar 18th, 2024 12:36 Join Date: Dec 2003 Location: Cambridge	I have no experience of 40 series auto boxes, but can generalise. Problems upshifting I have found usually result from incorrect trans fluid levels. Check yours as it has been changed recently. If it's overfull you need to drain some pronto. Follow the handbook for the correct way to check it. Your engine temperature is too low. It should run at 80-90 degrees. This will be causing overfuelling, assuming 80-90 is what your gauge used to read and it's not a faulty gauge. If your gauge is reliable, change the thermostat. If the temp is still low, change the coolant temp sensor. In that order, cheapest first. Let us know how you get on __________________ Tim '16 XC60 SE Lux Nav

Jan 13th, 2006, 19:44	#3
Rooster Speed freak Last Online: Apr 3rd, 2020 22:04 Join Date: Nov 2003 Location: Yorkshire	Think i agree it sounds like your thermostats stuck open and the cars not getting warm my old s40 used to run around 82 degrees under normal driving. I would change thermostat and temp senser at same time as you need to take cover off that holds stat in place to replace sensor so while you do stat you might aswell put a senser in aswell for peace of mind. I put a new stat and senser in mine last month 108k on clock cos engine warning light came on and said fault with sensor. __________________ 04 XC90 D5 --- Big bus 00 pug 306HDi --- Run about 88 pug 309GTi --- Project track car 07 CB600 Hornet --- 2 wheel fun

Jan 13th, 2006, 21:35	#4
vjck_uk Premier member Last Online: Jul 29th, 2017 15:54 Join Date: Nov 2002 Location: southern edge of birmingham	temp the temp is way to low it should be around 90 ,mine was running at 85 and i put a new stat in .its now gone up 2 mpg contastantly

Jan 15th, 2006, 13:56	#6
volcol Junior Member Last Online: Oct 28th, 2007 19:14 Join Date: Dec 2004 Location: bristol	Update Once again many thanks for advice i fitted a new thermostat yesterday at a total cost inc antifreeze of less than a tenner ,and on usual trip today average consumption is rising from the 22mpg i was getting up to around 24 and hopefully will keep climbing Col

Jan 13th, 2006, 22:46	#5
volcol Junior Member Last Online: Oct 28th, 2007 19:14 Join Date: Dec 2004 Location: bristol	Many thanks to you all for replying ,it seems i need a new thermostat then in all fairness this was suggested to me on an earlier posting but i dismissed it because heater was ok ,i dont actually have a guage in mine just got a digital display multifunction thing ,and even on a very hard run temp doesnt go much over 70 ,is it a fairly easy job to replace once again very many thanks to all took trouble to reply it is much appreciated Col

Jan 16th, 2006, 11:12	#7
vjck_uk Premier member Last Online: Jul 29th, 2017 15:54 Join Date: Nov 2002 Location: southern edge of birmingham	gears if its still slow in changing up you havent by any chance got the sports switch on have you ?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)