JTS Injectors DONE - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Thread Tools Search this Thread
(Post Link) post #1 of 11 Old 09-09-12 Thread Starter
Status: -
AO Member
Join Date: Jan 2012
Location: United Kingdom
County: Greater London
Posts: 19
JTS Injectors DONE

For the last 3 or 4 months I've been having problems with my 156 JTS, rough idling and bad flat spots when accelerating and constant MCSF light on the dash board.
The fault codes P0100, P0101 & P0172, all relating to misfire issues.
I cleaned the spark plugs, MAF, swapped around the coil packs but to no avail, everything still pointed to cylinder No 1 misfire. So reluctantly I got my trusty "indy", Phil @ Alfa Craft to remove the injectors. I'd made arrangements and took the injectors to Richard @ ASNU the specialist in ultra-sonic injector cleaning. Richards initial comments were, they were some of the dirtiest injectors he'd seen and the white seal on the injector spout showed signs of engine over heating. The injectors were put on the Spray Pattern test rig, fault found immediately, injector No 4 did not spray, merely dribbled. The second test was through flow, the perfect score was 100. Inj' 1 =96, 2=85, 3=90 & 4=35, injector 4 failed. I have attempted to upload some pictures,
Pic' 1 showing dirty injectors
Pic' 2 showing spray pattern test, not a great photo but Inj' 4 is clearly not spraying.
Pic' 3 showing flow through volumes, cylinder 4 clearly has limited flow through.
All injectors were ultra sonically cleaned, the flow through rates on injectors 1 to 3 improved, injector 4 remained the same.
What caused injector 4 to fail, no one can be 100% certain, I would agree with engine over heating from a previous owner.
A NEW injector found it's way to cylinder 4 and everything put back to how it was before.
Richard advised to run the engine at idle for 15 mins to let to ECU start to relearn or remap
itself and then to proceed with some vigorous driving.
I've had the car back for 5 days and its driving like a dream, I'm still working on the remapping exercise , lots of long acceleration unto 5000 revs and up hill climbing, its fun.

So are injectors the bane of the JTS, probably, but only the fact that are awkward remove when they need cleaning. I am informed by the experts that injectors rarely fail they just need a little TLC from time to time.

Attached Images
File Type: jpg IMG_0618.jpg (38.8 KB, 83 views)
File Type: jpg IMG_0619.jpg (65.8 KB, 76 views)
File Type: jpg IMG_0621.jpg (60.8 KB, 96 views)
Reid123 is offline  
Sponsored Links
Status: I have a GTA now!
AO Member
Alfa156Melb's Avatar
Join Date: Oct 2011
Location: Australia
County: Victoria
Posts: 930
Images: 14
Great post!
Alfa156Melb is offline  
Status: Still very confused
AO Member
Join Date: Feb 2005
Location: United Kingdom
County: Cheshire
Posts: 846
I am experiencing the same issues to a point, I have had a spare set of injectors cleaned and I am just waiting for my moment of madness to do the job. thanks for sharing your experience.
Philjay50 is offline  
Status: 00 V 00
AO Silver Member
alfamj's Avatar
Join Date: Jul 2010
Location: Ireland
County: Dublin
Posts: 1,313
Images: 16

Member car:

'05 350z

Interesting post. Glad you got it sorted.
alfamj is offline  
Status: OEM++
AO Silver Member
Egon's Avatar
Join Date: Jan 2012
Location: United Kingdom
County: Kent
Posts: 2,008

Member car:

147ts plus bits

I took 4 out of my 1.6 ts and changed the bucket filters, orings and dropped them in our ultrasonic cleaner at work along with some unpronounceable chemicals pumped through them at the same time.
There was a fair amount if crud in them for 80,000 miles.
Much nicer to drive after.
Egon is offline  
Status: -
AO Member
Join Date: Dec 2011
Location: United Kingdom
County: Gloucestershire
Posts: 118
Images: 4
Very helpful post Reid. How long did it take and do you think that cleaning as opposed to replacing is the way forward. We have a Gt low miles, with similar problems and don't want to ruin the cat. It seems to run rich, plugs and exhaust sooty, comes on under load. What does it cost to clean the injectors? Thanks in advance. I posted on this a few days ago, title, replacing injectors?
Dickymint99 is offline  
(Post Link) post #7 of 11 Old 10-09-12 Thread Starter
Status: -
AO Member
Join Date: Jan 2012
Location: United Kingdom
County: Greater London
Posts: 19
The guys at ASNU can clean them to almost NEW, if there's no actual mechanical fault. My flow through rates after cleaning were Inj' 1 = 102, 2 =91 & 3 = 96 out of 100 (yes I know). The ECU has an adaptation range of 15% + or -. I was lucky enough to watch the whole process, they are now near perfect. Cost for cleaning was about 120. Cost for removal & replacement is between me and my mechanic but a lot less then any price I've seen on this forum. It's a 2 or 3 day process, remove, send for cleaning and replacement. I looked after the cleaning aspect which helped speed up the process.
I'll check your post.
Reid123 is offline  
Status: -
AO Member
Join Date: Aug 2008
Location: Singapore
County: -
Posts: 11
Thanks for the post and pictures of the injectors. I am planning to clean my injectors to cure a rough idle issue (having done all the usual swaps etc)

Injector 4 is clearly faulty, I wonder why the ECU fault code did not show that but point to others. Makes me wonder now if my cylinder 1 and 3 fault code are injector related.

fgc is offline  
Status: -
AO Member
Join Date: Nov 2007
Posts: 66
Images: 2
I've been searching the forum but can't find a post which runs through removing the injectors. Is there any online guide ? thanks
sjn2004 is offline  
Status: -
AO Member
Join Date: Oct 2009
Location: Estonia
County: Parnumaa (Parnu)
Posts: 108
Images: 10

Member car:


Had my JTS injectors tested last week. Car has 90000 km on clock and I had it from 45000 km.
First test was leakdown and all four passed OK.
After that spray patterns were also OK.
Flow through test results were Inj' 1 =94, 2=95, 3=94 & 4=97.
Because we were the not sure what test to run we choosed the 30 sec. test.
What is the max. allowed flow range difference between injectors still to be acceptable?
Those values seemed good to the operator so we didn't ultrasonic clean them.
All seals were changed. Visually checked the injector filters as well and didn't replece them as they seemed to be in good contitions.
I have been using injector cleaner after every 5000 km.
Seems to be working good when looking at the test results or what.
Kristop is offline  
Status: -
AO Member
Join Date: Mar 2010
Location: New Zealand
County: Canterbury
Posts: 52
Images: 18


Do y'all think that a faulty injector could give me a low reading on a leak down test? I have one pot that is down a bit on a leak down test.
Was running like last week ...and....i have replaced a downstream O2 sensor that was showing on diag as no good. We found the downstram ones had spacers too!! The new one is not using the spacer.
It also 'piks' a bit even on 98 octane. It is a little better since the O2 sensor.


'05 2.0JTS with 59000km

[/QUOTE][/QUOTE]If "Lucas is the Prince of Darkness" - 'Spaggetti' Marrelli does a good impersonation!!!
NZOLIVER is offline  

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

idling , injectors , jts , jtsengine

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