Regen - power delivery - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Thread Tools Search this Thread
(Post Link) post #1 of 4 Old 22-07-15 Thread Starter
Status: -
AO Member
Join Date: Sep 2014
Location: United Kingdom
County: Derbyshire
Posts: 50
Regen - power delivery

I've wondered for a while so thought I'd ask ...

My 159 JTDM 1.9 regens quite regularly. I notice it happening almost immediately and not just because of negative aspects such as the drop in MPG.
I seem to get better, smoother power delivery, a quieter turbo whine and the car feels more responsive with the power delivery - almost twitchy!

Does anyone else get similar?

Are there any engine component that gets bypassed during regens?
Rosso159 is offline  
Sponsored Links
Status: Why is the rum gone?
AO Member
Join Date: May 2012
Location: United Kingdom
County: Greater Manchester
Posts: 627

Member car:

159 2.0JTDm SW

How often is 'quite regularly'?

Mine regened every 300 miles or so when the DPF was end of life.

The increase in performance 'might' be a sign that your car is running lean in normal operation, As the regen chucks more fuel in (albeit during the exhaust stroke, it will still result in some extra fueling for the compression stroke)

the turbo will be quieter as it's doing less during a regen, if you take your foot off the gas pedal the turbo spools down completely.

Running lean is either because there is not enough fuel or too much air.

First thing I'd try is reset the ECU, (disconnect battery for 20 mins)

then check injector correction values and flow rates (IIRC MES tells you both these figures)

(could be a knackered injector or two)


Or there might not actually be anything wrong (just realised the first thing I thought was, it might be broken, but re-reading your post it occurs that it might just be the way your car is?)

My 1.9 got louder when regenning, but I never noticed an increase in performance, but like you say I could definatly tell when it was doing one, not just because of the fuel consumption.

FiremanAxe is offline  
(Post Link) post #3 of 4 Old 22-07-15 Thread Starter
Status: -
AO Member
Join Date: Sep 2014
Location: United Kingdom
County: Derbyshire
Posts: 50
Like you say, it could just be a 'feature' of my car
Mine regens every 300 to 400 miles. The last time a reading was taken it was at 60%

I wonder if I have a leak or split pipe somewhere causing the engine to run lean...
Rosso159 is offline  
Status: 159 Cruiser and Guilietta pocket rocket
AO Silver Member
giblets46's Avatar
Join Date: Jul 2012
Location: United Kingdom
County: Warwickshire
Posts: 4,206
Regen - power delivery

My 1.9 regened once per tank (700miles), understand it's more regularly for the 2.4. It's normally done on time or pressure (in the DPF)

Interestingly during regens the EGR remains closed throughout the cycle (or it would be allowing fuel enriched air back into the manifold and cylinders (not a greatsc idea), so the turbo spools up quicker as a result!

Any spelling/ grammatical errors are purely there to annoy!
giblets46 is offline  

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

delivery , power , regen

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