Investigating Error Codes
#21
Been driving most of the week and monitoring the OBDC. P0174 and P0171 have been appearing after each clearing of the fault codes. Today removed all the 'pipes' from the air box to the throttle body. All the electrical connections are cleaned as well as the inside of all the 'pipes'. Removed the MAS and replaced with the new MAS that was causing the the other two fault codes. Will drive the XJ8 to day and see what fault codes may appear. I will replace this MAF if something appears in the TORQUE application. More to come ...
Hi Beartoy,
In my experience the P0171 and P0174 codes are most often caused by unmetered air entering through a leak in the intake air plumbing somewhere between the MAFS and the cylinder head. Just thinking out loud, is it possible that while performing the work that led to installing the new MAFS, you left an air duct or hose clamp untightened, or a hose not fully seated on its fitting, or did you possibly forget to reinstall one of the duct seals, Part 3 or 6 in the diagram below?
Cheers,
Don
The following users liked this post:
sparkenzap (07-26-2014)
#23
#25
Thread
Thread Starter
Forum
Replies
Last Post
KarimPA
S-Type / S type R Supercharged V8 ( X200 )
8
09-27-2015 08:46 AM
Dickie_L_J_O
XJ XJ8 / XJR ( X308 )
8
09-13-2015 07:44 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)