147 2.0 Poor Mpg - Alfa Romeo Forum
You are currently unregistered, register for more features.    
 
Thread Tools
(Post Link) post #1 of 20 Old 25-08-16 Thread Starter
Status: Just wait for it...
AO Member
 
Garakis147's Avatar
 
Join Date: Jun 2013
Location: Greece
County: Greece,Crete
Posts: 185
147 2.0 Poor Mpg

My 147 gets around 15 l/100km which is very bad mpg for my driving. I usually do most miles in country roads without hard starts or reving hard and always I get it warm up
So far I have replaced
Maf
Thermostat
Air filter
Lamda and cats 3 years ago
I have steady temperature and idle revs but I am struggling to get 100km from 13 litres.
My fuel gauge is totally ok because I tested it and it wouldn't start a morning because of fuel lack.
Spark plugs have been replaced 3 years ago or 40.000km
I have cleaned air intake and throttle body and there are no leaks.
The only thing I can suspect for such a poor mpg are the cats.
If I remove pre cats will I see big improvements in mpg?
I have ordered elm327 to see if there is any fault.
Also I have reseted ecu.
Garakis147 is offline  
Sponsored Links
Advertisement
 
Status: -
AO Silver Member
 
alfizta's Avatar
 
Join Date: Jun 2008
Location: Portugal
County: -
Posts: 2,677
Images: 10
I think Cats would only affect mpg if they are broken inside.
would check lambdas for proper operation, but ecu fault code reading is necessary as well the output signals.
alfizta is online now  
Status: SOLD my 156!
AO Gold Member
 
gazza82's Avatar
 
Join Date: Jan 2003
Location: United Kingdom
County: Buckinghamshire
Posts: 8,467
Images: 12
Garage
If Lambda's aren't Bosch, they don't send the right signals!
gazza82 is offline  
 
Status: if it works, take it apart to finde out why
AO Silver Member
 
GTV-TB's Avatar
 
Join Date: Dec 2008
Location: Sweden
County: Skåne
Posts: 1,063

Member car:

GTV-TB

Engine temp sensor faulty? the temperature you see on the temp gauge are maybe not the same as engine ECU sees, the temperature sensor is 2 in 1 (gauge + engine).
GTV-TB is offline  
Status: Vivat least vaguest.
AO Member
 
Join Date: May 2016
County: -
Posts: 708
I've personally experienced the front cats failing inside and choking the car terribly.
addo is offline  
(Post Link) post #6 of 20 Old 26-08-16 Thread Starter
Status: Just wait for it...
AO Member
 
Garakis147's Avatar
 
Join Date: Jun 2013
Location: Greece
County: Greece,Crete
Posts: 185
Lambda are bosch genuine.
Will diagnost see the temperature that ecu sees?
Garakis147 is offline  
Status: On Alfa number 15
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
County: Oxfordshire
Posts: 34,361
Images: 13
Brakes binding?

Was the MAF a genuine Bosch
symon is offline  
Status: -
AO Silver Member
 
Join Date: Jul 2004
Location: United Kingdom
County: Derbyshire
Posts: 5,826
Quote:
Originally Posted by Garakis147 View Post
Will diagnost see the temperature that ecu sees?
I had a temperature sensor fail on my 145. The temperature shown on the gauge was OK, but diagnostics showed that the ECU was seeing a low reading, which meant that it was overfuelling as the temperature data it was seeing indicated that the engine was still cold even when it was up to normal operating temperature.
Dave Brand is offline  
jwq
Status: Giulia Veloce AWD ordered
Club Member
Membro Premio
 
jwq's Avatar
 
Club Member Number: 857
Join Date: Jan 2005
Location: The Netherlands
County: Zuid Holland
Posts: 4,524
Images: 16
Quote:
Originally Posted by Garakis147 View Post
Will diagnost see the temperature that ecu sees?
Temp you read via OBD is the temp the ECU "sees", and on the 147 this is also the temp displayed on the temp guage, though it displays 90 degrees for all temperatuurs between 80 and 100 degrees .....
Attached Images
File Type: png Knipsel.PNG (61.9 KB, 13 views)

Last edited by jwq; 26-08-16 at 13:01.
jwq is offline  
(Post Link) post #10 of 20 Old 26-08-16 Thread Starter
Status: Just wait for it...
AO Member
 
Garakis147's Avatar
 
Join Date: Jun 2013
Location: Greece
County: Greece,Crete
Posts: 185
My variator is ticking a little bit at cold start.Does this affects mpg?
Maf is genuine
Garakis147 is offline  
Status: if it works, take it apart to finde out why
AO Silver Member
 
GTV-TB's Avatar
 
Join Date: Dec 2008
Location: Sweden
County: Skåne
Posts: 1,063

Member car:

GTV-TB

Quote:
Originally Posted by Garakis147 View Post
My variator is ticking a little bit at cold start.Does this affects mpg?
No.
GTV-TB is offline  
Status: On Alfa number 15
AO Platinum Member
 
symon's Avatar
 
Join Date: Dec 2005
Location: United Kingdom
County: Oxfordshire
Posts: 34,361
Images: 13
Quote:
Originally Posted by GTV-TB View Post
No.

It will do if it has failed to the point of not operating the variable cam timing correctly.

Normally they will rattle all of the time when this happens though.


Just a thought, when was the cambelt last changed and were the correct cam locking tools used?

Incorrect cam timing will reduce the engines power and torque output, so you will have to press the accelerator harder (and use more fuel) to travel at any given speed.
symon is offline  
(Post Link) post #13 of 20 Old 27-08-16 Thread Starter
Status: Just wait for it...
AO Member
 
Garakis147's Avatar
 
Join Date: Jun 2013
Location: Greece
County: Greece,Crete
Posts: 185
Well,cam belt should had been replaced 1 month before but it has 40.000km
It has been done by specialist so no reason to worry.
Garakis147 is offline  
(Post Link) post #14 of 20 Old 28-08-16 Thread Starter
Status: Just wait for it...
AO Member
 
Garakis147's Avatar
 
Join Date: Jun 2013
Location: Greece
County: Greece,Crete
Posts: 185
How can I test a broken cat?
And how will I "read" a failed lambda in diagnostic ?
Garakis147 is offline  
Status: Vivat least vaguest.
AO Member
 
Join Date: May 2016
County: -
Posts: 708
Visual inspection of both ends of a cat, is one way. Else you need to check pressure before and after the cat when you are pushing the car, just idle or light loading will not give an accurate result. You should be easily able to see through a cat with a bright light on the far side of it.

A dying lambda sensor may not cycle around its typical designed operating voltage on a fully warmed motor, or you can put it on a scope. Else use a gas analyser or third party lambda sensor temporarily hooked to the end of your car's exhaust pipe.
addo is offline  
(Post Link) post #16 of 20 Old 31-08-16 Thread Starter
Status: Just wait for it...
AO Member
 
Garakis147's Avatar
 
Join Date: Jun 2013
Location: Greece
County: Greece,Crete
Posts: 185
Both lambdas are working and okay.
Diagnost doesn't show anything wrong.
Maf is okay as well.
Coolant temperature is between 87 and 95.
Precats were removed yesterday.
Consumption is still the same
Garakis147 is offline  
Status: SOLD my 156!
AO Gold Member
 
gazza82's Avatar
 
Join Date: Jan 2003
Location: United Kingdom
County: Buckinghamshire
Posts: 8,467
Images: 12
Garage
Is this with or without the turbo on it .. ???

15l/100km ??? Need to work out what this is in english .. (mpg!)

OK .. that seems to be about 18 mpg .. I can do that in my 2.0 IF I have my foot on the floor everywhere ..
gazza82 is offline  
(Post Link) post #18 of 20 Old 31-08-16 Thread Starter
Status: Just wait for it...
AO Member
 
Garakis147's Avatar
 
Join Date: Jun 2013
Location: Greece
County: Greece,Crete
Posts: 185
Without turbo
Just decat, hks air filter and smaller crankshaft pulley.
15l/100 is around 18 mpg yes you are right
Well I sometimes hit my leg on the floor but not very often.
I would be worried if there was a performance drop.
Garakis147 is offline  
Status: SOLD my 156!
AO Gold Member
 
gazza82's Avatar
 
Join Date: Jan 2003
Location: United Kingdom
County: Buckinghamshire
Posts: 8,467
Images: 12
Garage
The only time my 2.0TS was thirster than normal was when I had the wrong lambda fitted (NTK not Bosch) but that also shoed on the diag system. (And not that thirsty, but you also have more lambdas!)

Is the HKS one of those cone filters? Cone filters aren't that great according to posts on here ..
gazza82 is offline  
(Post Link) post #20 of 20 Old 04-09-16 Thread Starter
Status: Just wait for it...
AO Member
 
Garakis147's Avatar
 
Join Date: Jun 2013
Location: Greece
County: Greece,Crete
Posts: 185
Parked her last night with a little bit less than a half tank of fuel and today it was almost empty ?
Diagnost shows 49.8 % fuel remaining.
Which one should I believe?
Also I can hear the fuel pump being louder than usual.
Attached Images
File Type: jpg Screenshot_2016-09-04-17-21-20_1472999310374.jpg (16.4 KB, 12 views)
Garakis147 is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Alfa 147, 156 & GT

Tags
147 , mpg , poor

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
Replace with
For the best viewing experience please update your browser to Google Chrome