Register Login
The UK's No.1 Chrysler Owners Forum
Reply
 
Thread Tools
Old 29-04-2007   #1
Join Date: Apr 2007
Location: Lisboa
Posts: 2
Thanks: 0
Trader Rating: 0
Portugal 
poor mpg on fiat punto 1.2 8v,please help!

Hello everybody!

About 2 months ago I bought a third hand fiat punto 1.2 8v,with aproximately 100.000kms on the clock.And since then,I have been registering a very high fuel comsumption,really poor mpg!I have changed the air filter,plugs,spark plugs and even took it to a diagnostic machine to check for faulty sensors,but the ECU is found to be in great shape,no faulty sensors whatsoever.The mechanic tould me that it was burning all the fuel properly,there were no CO2 problems with the exaust meaning that thereīs really nothing wrong with O2 sensors.I also changed the clucth 2 days ago,but all in all,mpg remains the same.I drive like a very old granny,no town driving,just 80 kph on freeway,and going very easy on the throttle.tyre pressure is ok,but 175/70 are fitted,instead of the 155/60,can this be causing all the problmes?
Iīm registering an average of about 9litres per 100 kms,not normal.
And the car seems to be pulling fine,no trouble at all.
A friend told me I could have a ruptured exhaust,or fuel line,but theres no smell not even noise.
Please excuse my english,Iīm from portugal!
hope someone can help me.
many thanks!

p.s.:altough having this problem(and some others),I just love my punto
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

Srgio de Faria e Silva is offline Reply With Quote Quote 
Old 01-05-2007   #2
puntopower!
 
matty seasider's Avatar
Join Date: May 2003
Location: northwest
Posts: 1,218
Thanks: 96
Trader Rating: 6
matty seasider has donated!
United Kingdom 
Re: poor mpg on fiat punto 1.2 8v,please help!

id recomend fitting a new thermostat.

i have the 1.8 punto hgt, and mine had real poor fuel economy, fitted a new thermostat yesterday, and its gone from doin 22mpg, to 28mpg, what a difference from a Ģ20 thermostat.

very easy to install, on your engine its on the righ hand side of the cylinder head...

try shopforparts.co.uk for a good price on one.

you should be able to tell if your thermostat is a bit dodgy, it may take a while to get to half on the gauge, not stay at half, etc.

chers and hope it works for ya!
Thanks Robs thanked for this post
Likes Robs liked this post
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

matty seasider is offline Reply With Quote Quote 
Old 01-05-2007   #3
Join Date: Jun 2006
Posts: 1,349
Thanks: 27
Trader Rating: 0
fenton_jd has donated!
United Kingdom 
Re: poor mpg on fiat punto 1.2 8v,please help!

Mine has exactly the same problem, although my engine is totally shagged but it doesnt feel lacking in performance.

I cant find any leaks anywhere, Its doing my head in.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

fenton_jd is offline Reply With Quote Quote 
Old 02-05-2007   #4
Join Date: Oct 2006
Posts: 33
Thanks: 0
Trader Rating: 0
Spain 
Re: poor mpg on fiat punto 1.2 8v,please help!

Quote Originally Posted by Srgio de Faria e Silva View Post
Hello everybody!

About 2 months ago I bought a third hand fiat punto 1.2 8v,with aproximately 100.000kms on the clock.And since then,I have been registering a very high fuel comsumption,really poor mpg!I have changed the air filter,plugs,spark plugs and even took it to a diagnostic machine to check for faulty sensors,but the ECU is found to be in great shape,no faulty sensors whatsoever.The mechanic tould me that it was burning all the fuel properly,there were no CO2 problems with the exaust meaning that thereīs really nothing wrong with O2 sensors.I also changed the clucth 2 days ago,but all in all,mpg remains the same.I drive like a very old granny,no town driving,just 80 kph on freeway,and going very easy on the throttle.tyre pressure is ok,but 175/70 are fitted,instead of the 155/60,can this be causing all the problmes?
Iīm registering an average of about 9litres per 100 kms,not normal.
And the car seems to be pulling fine,no trouble at all.
A friend told me I could have a ruptured exhaust,or fuel line,but theres no smell not even noise.
Please excuse my english,Iīm from portugal!
hope someone can help me.
many thanks!

p.s.:altough having this problem(and some others),I just love my punto
Hola Sergio,

I have suffered a similar problem and I went almost crazy trying to identify what in hell was wrong (I have a Fiat Punto 75S 1995, 105000km). In my case the injectors warning light would turn on after some driving (no always though) so I was sure it was some fuel injection related issue. The car was also lacking power, it could not make it any faster than 140km/h.

One day I finally got the problems solved by doing these 3 things in that order:
1. I tested the compression which resulted to be really low, especially on two of the cylinders. I sorted this out by cleaning the pistons.
2. I change the ht leads.
3. I reset the ECU

Now the car can reach about 160km/h (it takes its time though) and uses the same amount of fuel described on its technical specifications (which by the way its still quite high for such an small car/engine).

I hope this helps.

Saludos desde Espaņa :-)

/N
Likes puntonew liked this post
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

newstor is offline Reply With Quote Quote 
Old 02-05-2007   #5
Join Date: Oct 2006
Location: Scotland
Posts: 1,583
Thanks: 6
Trader Rating: 0
Punto.Power has donated!
United Kingdom 
Re: poor mpg on fiat punto 1.2 8v,please help!

As said above, replace your thermostat also i would change my lambda sensor and fuel filter, have you gave it an oil and oil filter change lately? Then after all of those have been done reset the ECU by disconnecting the battery over night, this should help the fuel consumption.
Likes puntonew liked this post
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

Punto.Power is offline Reply With Quote Quote 
Old 04-05-2007   #6
Join Date: Apr 2007
Location: Lisboa
Posts: 2
Thanks: 0
Trader Rating: 0
Portugal 
Re: poor mpg on fiat punto 1.2 8v,please help!

Hello again!

I would like to thank all of you who managed to find some time to reply to this!Iīm soon going to spend some more time trying to find the cause to all this,but still,my punto must be needing an oil change.I didnīt knew that it would cause mpg issues,so,that will be on the top of my priority list to do on the damn car!(I just love it still...)
About the thermostat,I went to a parts store and looked at a thermostat,but I really canīt figure out how it can cause any mpg issues as it has no sensors envolved whatsoever,itīs basically a mechanical part.About the pistons,Iīll give it a try,but that doesnīt seem to be the problem īcause Iīve manached to reach 170 km per hour for several miles!It pulls away nice as well,altough it seems that in low gears,it seems a bit sluggish...the fuel filter has been changed at aprox. 60.000kms,donīt know if itīs necessary to replace that...
Once again,thank you all for your kindness!

(iīm just glad I have a cute little smart roadster when thereīs not that much money to spend on gas )

__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

Srgio de Faria e Silva is offline Reply With Quote Quote 
Old 10-05-2007   #7
Join Date: May 2007
Location: fradley, 1/2 hr from brum
Posts: 3
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: poor mpg on fiat punto 1.2 8v,please help!

have you chaned the HT leads, my 1.2 8v was really sluggish at low revs, i found it had 2 split HT leads, changed the leads and the plugs, an it goes better than it ever has.
Likes puntonew liked this post
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

philj69 is offline Reply With Quote Quote 
Old 12-05-2007   #8
Join Date: May 2007
Posts: 3
Thanks: 0
Trader Rating: 0
Re: poor mpg on fiat punto 1.2 8v,please help!

I assume that your brakes are not binding! Check to see if they are hot.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

nch is offline Reply With Quote Quote 
Old 13-02-2012   #9
Join Date: Aug 2011
Posts: 11
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: poor mpg on fiat punto 1.2 8v,please help!

Quote Originally Posted by matty_oakley View Post
id recomend fitting a new thermostat.

i have the 1.8 punto hgt, and mine had real poor fuel economy, fitted a new thermostat yesterday, and its gone from doin 22mpg, to 28mpg, what a difference from a Ģ20 thermostat.

very easy to install, on your engine its on the righ hand side of the cylinder head...

try shopforparts.co.uk for a good price on one.

you should be able to tell if your thermostat is a bit dodgy, it may take a while to get to half on the gauge, not stay at half, etc.

chers and hope it works for ya!
Thank for the info as my punto's temp is never at half and always lower.so i will replace temp gauge.makes sense as when i got the car the temp was normally in the middle, thanks!
Likes puntonew liked this post
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

Robs is offline Reply With Quote Quote 
Old 13-02-2012   #10
Join Date: Mar 2006
Location: Liverpool
Posts: 27,181
Thanks: 1199
Blog Entries: 3
Trader Rating: 5
fingers99 has donated!
United Kingdom 
Re: poor mpg on fiat punto 1.2 8v,please help!

Replace thermostat, not temp guage. Id the thermostat is jammed open, or missing, the engine will run cold. The ECU will compensate by running rich -- effectivelt like driving with the choke on, all the time.

Binding brakes will make a terrific difference to fuel consumption.
Thanks Robs thanked for this post
Likes puntonew liked this post
__________________
M12 fund Ģ20

Last edited by fingers99; 13-02-2012 at 16:21.
fingers99 is offline Reply With Quote Quote 
Old 13-02-2012   #11
Join Date: Aug 2011
Posts: 11
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: poor mpg on fiat punto 1.2 8v,please help!

Quote Originally Posted by fingers99 View Post
Replace thermostat, not temp guage. Id the thermostat is jammed open, or missing, the engine will run cold. The ECU will compensate by running rich -- effectivelt like driving with the choke on, all the time.

Binding brakes will make a terrific difference to fuel consumption.
sorry my bad i meant thermostat,yes i agree jammed open i think coz car takes age's to warm up.running at 38mpg

So im going to replace it.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

Robs is offline Reply With Quote Quote 
Reply
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump
Similar Threads
Thread Thread Starter Forum Replies Last Post
(G) How many Puntos are there on the Forum? - The Thread FiatStiloJTD Punto (Mk2/2b) 543 06-06-2008 17:15