MASS AIR FLOW METER

Moderators: JimMann, aaj, mike020150

lovejags
Posts: 33
Joined: Thu Nov 26, 2015 8:07 pm
Location: MALTON YORKSHIRE

MASS AIR FLOW METER

Postby lovejags » Wed Aug 15, 2018 7:29 pm

Hi i have a 2007 xkr two fault codes have come up P0171 P0174,computer says system too lean bank1 and bank 2. I take it there's no easy way of finding a leak as i guess it isn't bound to be the sensors.

mike020150

Member
Posts: 2353
Joined: Wed Feb 08, 2006 6:26 pm

Re: MASS AIR FLOW METER

Postby mike020150 » Thu Aug 16, 2018 10:51 am

If the fault codes read lean, you have all the usual possibilities to check, from leaking vacuum pipes to blown exhaust manifold gaskets, in addition to the lambda sensors & maf. However, since lambda sensors are just like spark plugs (their performances deteriorate steadily), if they are the original 2007 items, they have to be pretty high up the list of suspects. Mike.
2014 XK Dynamic R convertible; 1977 Daimler Double Six Coupe; XE S

davidr

Moderator
Posts: 1877
Joined: Thu Sep 08, 2005 8:31 pm
Location: Salisbury, Wilts

Re: MASS AIR FLOW METER

Postby davidr » Thu Aug 16, 2018 9:16 pm

Leaks in the induction system can be checked by a specialist with a smoke machine. It pumps smoke into the inlets and then you look for any smoke emerging from any joins, splits etc.

User avatar
Delboy
Posts: 24
Joined: Thu Jan 07, 2010 10:36 pm

Re: MASS AIR FLOW METER

Postby Delboy » Sun Aug 19, 2018 1:10 pm

If the code result is definitely fuel mixture lean on one or both banks then I suspect this is because of a particular leaking vacuum pipe.
The first place to look is quite easy and if its what I think it is, it is also an easy and cheap fix.
Remove the XKR plastic engine cover. Shine a torch down onto the top of the supercharger unit. Just to the drivers side of where the letters V8 are embossed on top of the supercharger look down and you should see a thin plastic pipe with rubber connector on the end attached to the side of the SC housing. I'm guessing all you'll see is a shiny metal nozzle sticking out where the rubber connector has come off.
If that is the case, have good look around in the dip as it will be in there somewhere, there's no way out for it. You will see the plastic pipe laying along the gulley next to the SC. You should be able to re-attach the rubber elbow to the pipe and push it back onto the SC nozzle as a temporary fix. Secure it with a cable tie or two. Once the cable tie is tight, pull it off the nozzle, tighten it just one more click, then push it back on. It should stay put okay but it is obviously very worn.
After while the EMU warning light should go out.
The replacement part is still available from Jag dealers, cost about £24 and is part number AJ811093. It is quite easy to remove the old part and refit the new part. Be sure to pull the protective cover off the other end of the vacuum pipe before fitting.
I hope this helps, good luck.

lovejags
Posts: 33
Joined: Thu Nov 26, 2015 8:07 pm
Location: MALTON YORKSHIRE

Re: MASS AIR FLOW METER

Postby lovejags » Mon Aug 27, 2018 2:58 pm

Thanks del boy had a look this morning you were spot on, just ordered vacuum pipe from sng barratt,will fit and keep you posted.

lovejags
Posts: 33
Joined: Thu Nov 26, 2015 8:07 pm
Location: MALTON YORKSHIRE

DRIVE/SUPERCHARGER BELTS

Postby lovejags » Tue Aug 28, 2018 8:43 pm

Hi is it quite a straight forward job to change the two belts on my 2007 xkr?

mike020150

Member
Posts: 2353
Joined: Wed Feb 08, 2006 6:26 pm

Re: MASS AIR FLOW METER

Postby mike020150 » Wed Aug 29, 2018 3:00 pm

Changing the belts is reasonably straightforward as long as you have suitably long tools and a strong right arm to hold back the tensioners. If the belts are well worn, changing the tensioners too wouldn't be a bad plan. Don't forget to draw a pic of the belt routeing before you start. Mike.
2014 XK Dynamic R convertible; 1977 Daimler Double Six Coupe; XE S


Who is online

Users browsing this forum: No registered users and 6 guests