Strange fuel consumption (159 2.4 Diesel) - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Thread Tools Search this Thread
(Post Link) post #1 of 3 Old 10-03-15 Thread Starter
Status: -
Join Date: Mar 2015
Location: United Kingdom
County: Nottinghamshire
Posts: 6
Strange fuel consumption (159 2.4 Diesel)

I have owned my 159 2.4 ti for a couple of months now and have noticed some strange fuel consumption antics - just wondering if anyone knows what is happening, not a problem I am just curious.

I do a lot of motorway miles, so tend to set the cruise to 60mph (100kph) and let it do its thing.

I watch the instant fuel consumption and turbo gage, which both vary as you go up and down hill, but occasionally and only for around 5 minutes maximum, the instant fuel consumption drops from 40ish mpg down to 25ish mpg and the turbo drops to zero, unless we hit a big hill.

Does anyone know what is happening? Is it clearing out the DPF perhaps? Nothing else really varies dramatically during the 5 minutes, then all of sudden we are back to normal again.

nathon_chiry is offline  
Sponsored Links
Status: Remapped and loving it!
AO Member
emerycloth's Avatar
Join Date: Dec 2012
Location: United Kingdom
County: Nottinghamshire
Posts: 70
Sounds very much like the DPF going through it's regen cycle. My 2.0 JTDM did exactly the same....until I had it removed!
emerycloth is offline  
Status: proud owner of a 159 too now
AO Member
Join Date: Sep 2011
Location: United Kingdom
County: Essex
Posts: 896
Images: 4
Yes that is a regen or regeneration full name. What's happening is the car heats up the dpf to 600c to burn off the soot inside the dpf, it does this by injecting diesel in the engine on the exhaust stroke = more fuel is used. It can last up to 10 mins. Ideally you should let it finish before stopping the car. If your dpf( diesel particulate filter ) is in good condition it should do it even 16 - 20 hours of running. Nothing to be concerned about that's how the car I'd designed. Oh one more thing no need to rev the engine just drive normal idea 2,000 rpm.
phwspider is offline  

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Alfa 159, Brera & 946 Spider

159 , consumption , diesel , fuel , strange

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

Advanced Search

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

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