I want to clean the MAFs on my 4.2L XKR. Manual says located someway past the air cleaner. I peeked in the engine bay and couldn't see where they were.

Are they accessible from the engine bay or do the wheel arch covers have to come off?

Thanks in advance - Mac.

 

Described in the workshop manual. Go into the wheel arches.

 

Unless you’ve got a specific reason, I’d leave them alone. The filters do their job keeping things clean and in 25+ years I’ve never had a need to clean one.

 

The problem is rough idle for around 60 secs on a cold start. This is after the JLR dealer smoke tested the vehicle when the valley hose replacement job they did and managed to screw up the throttle body gasket. From googling around one of the causes for poor cold idle is dirty MAF(s). I'm just trying to eliminate other causes than them doing a poor job. It may they haven't torqued down the intake plenums to the inlet manifolds.

The LTFT was +3 when I turned the car off last night after a good run around.I can still feel a slight roughness to the idle when warm. I didn't notice that prior to the valley hose job. It's too bad I didn't check the fuel trims before having them do the work. The dealership is a 3 hour drive, so it's not like I can just drop in with the car.

I'm going to get a shop nearby do a fuel trim check on both the banks to see if that my indicate a small vac leak on one compared to the other.

 

Behind the wheelarch liners (see items 15 and 20):





If it wasn't running rough BEFORE the valley hose replacement, check all inlet trunk joints for leaks and engine bay harness connectors are properly connected. Many dealer 'technicians' are working beyond their capabilities or experience on anything more complicated than an oil or brake pad change.

Graham

 

Thanks Graham - I found that pic in the manwell eventuallyyyy. Odd arrangement in those manwells.

 

Ok, so I ordered new air filters - got one done - location of MAF/IAT - bottom pic is looking up at the MAF from inside the filter box (sorry about the focus) - no way I'm going to dismantle that to clean the MAF sensor....Grrrrr.







Looking up to the MAF sensor:

 

AGREED. Not exactly user friendly navigation.

An improvement on the old JTIS (Jaguar Technical Information System) used for older models because there's no application installation and configuration required but the indexing needs work. I use the search facility in Adobe Acrobat but you need to know the right word or phrase to avoid stepping through sometimes hundreds of matches.

Graham

 

 

+3 LTFT is not bad at all, Jaguar denso ECUs don't throw check engine code until +-20% LTFT
Don't bother cleaning the MAF, these don't get dirty with the correct filters installed properly.

You can access the filters without removing the wheel if you turn the wheel inward and unbolt the flap bolts
then fold the flap back.