Long Term Sluggish Response Problem Solved
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From: Hampshire
Long Term Sluggish Response Problem Solved
Many months back I started a thread whingeing on about the sluggish throttle response in my yr 2000 XK8. I only realised it had the problem when I bought a yr 2000 Sovereign which, as soon as I touched the throttle, rocketted off. A solution was not forthcoming but a couple of peeps did post that felt they had the same problem. This post is for those people.
After a lot of trial and error by other XK owners in the UK we eliminated the TPS and the throttle body as the cause, and finally located it in the MAF. A new MAF off of eBay (£65 delivered) totally changed the car. Now if I push the pedal down (even a tiny bit), it accelerates. Previously it didn't until the pedal had moved a lot.
So if you feel that your throttle cable is connected to a sponge instead of the butterfly, change the MAF!
After a lot of trial and error by other XK owners in the UK we eliminated the TPS and the throttle body as the cause, and finally located it in the MAF. A new MAF off of eBay (£65 delivered) totally changed the car. Now if I push the pedal down (even a tiny bit), it accelerates. Previously it didn't until the pedal had moved a lot.
So if you feel that your throttle cable is connected to a sponge instead of the butterfly, change the MAF!
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From: Hampshire
If you suspect there's a problem just unplug the MAF. The car will run very lumpy and might stall on tickover, but it will run with 'restricted performance' (limited to 3000rpm), but if it suddenly goes much better then the MAF is faulty.
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I basically had the same problem.....Just wouldn't go...finally had to re-adjust the throttle cable on my 1998 Coupe.....The cable adjustment screw had backed-off and the cable slipped about a half inch. Adjusted it and off I went! (Sometimes it's simple)
Billy Clyde
Billy Clyde
I had this exact problem (I think I lived in denial over sluggish performance) and it started throwing a rich code. I had previously cleaned the MAF and replaced the TPS (it was throwing codes too) so I was thinking O2 sensors or something else. I finally gave in and took it to a dealer who must have done a better job cleaning the MAF. No codes and much better performance! Now I've got more coolant leaks and a hydraulic leak to the top to fix once I get her out of storage 
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purchase one and switch it between cars to establish cause and effect. FYI if you search around, the Mazda unit is usually the least expensive.
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from forum member jafari in the sticky thread https://www.jaguarforums.com/forum/x...-115180/page2/
This is a list of cars that use the same mass air sensor:
2000-2003 Jaguar Vanden Plas Exc. Supercharger
1999 Jaguar Vanden Plas
1999-2003 Jaguar XJ8
1999-2002 Jaguar XK8
2010 Mazda 3 2.3 Liters
2007-2009 Mazda 3 Turbo
2006 Mazda 6 Turbo
2010 Mazda CX-7 2.3 Liters
2007-2009 Mazda CX-7
2007 Mazda CX-9
2005-2006 Saab 9-2X
2004-2007 Subaru Impreza
2002-2003 Subaru Impreza 2.0 Liters
2008-2009 Subaru Legacy 2.5 Liters Turbo
2008-2009 Subaru Legacy 3.0 Liters
2004-2007 Subaru Legacy
2008-2009 Subaru Outback 2.5 Liters Turbo
2008-2009 Subaru Outback 3.0 Liters
2004-2007 Subaru Outback
2006-2007 Subaru B9 Tribeca
2004-2006 Subaru Baja Turbo
2004-2010 Subaru Forester
2008-2010 Subaru Tribeca
I used this info myself to get a hold of a used one for my Jag out of an old Subaru.
The most common one I came across (maybe OEM?) is Denso MB197400-3021, but there are others out there that fit all these cars.
Yes, for those looking to buy a new MAFS, the Mazda part from the 06' Mazda 3 is identical.
This is the part number 197400-2160.
The sensor also has this engraved on the plastic: L321.
This is a list of cars that use the same mass air sensor:
2000-2003 Jaguar Vanden Plas Exc. Supercharger
1999 Jaguar Vanden Plas
1999-2003 Jaguar XJ8
1999-2002 Jaguar XK8
2010 Mazda 3 2.3 Liters
2007-2009 Mazda 3 Turbo
2006 Mazda 6 Turbo
2010 Mazda CX-7 2.3 Liters
2007-2009 Mazda CX-7
2007 Mazda CX-9
2005-2006 Saab 9-2X
2004-2007 Subaru Impreza
2002-2003 Subaru Impreza 2.0 Liters
2008-2009 Subaru Legacy 2.5 Liters Turbo
2008-2009 Subaru Legacy 3.0 Liters
2004-2007 Subaru Legacy
2008-2009 Subaru Outback 2.5 Liters Turbo
2008-2009 Subaru Outback 3.0 Liters
2004-2007 Subaru Outback
2006-2007 Subaru B9 Tribeca
2004-2006 Subaru Baja Turbo
2004-2010 Subaru Forester
2008-2010 Subaru Tribeca
I used this info myself to get a hold of a used one for my Jag out of an old Subaru.
The most common one I came across (maybe OEM?) is Denso MB197400-3021, but there are others out there that fit all these cars.
Yes, for those looking to buy a new MAFS, the Mazda part from the 06' Mazda 3 is identical.
This is the part number 197400-2160.
The sensor also has this engraved on the plastic: L321.
Last edited by CorStevens; Feb 18, 2019 at 08:39 PM. Reason: additions
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From: on the road in NE Oklahoma
Z
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Yep. Same thing happened to me.
First off I tried cleaning the MAF please click here to see my post and click here too
Eventually I installed a new MAF. One of the easiest jobs you can do on our cars. Please click here to see what I mean.
First off I tried cleaning the MAF please click here to see my post and click here too
Eventually I installed a new MAF. One of the easiest jobs you can do on our cars. Please click here to see what I mean.
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From: Nevada, USA
don't about the 4,2 specifically, but likely, it's a rare part just like the MAF is on the 4.0 engines. I've looked high and low for a cross-referenced 4.0 MAF sensor. But the only cars that share the XKR 4.0 part are other Jaguar 4.0 supercharged engines, like the 4,0 XJR's for example.
Z
Z
http://densoautoparts.com/contact-us.aspx
try this link to contact them.
when i used the Denso website it produced no results for the XK8 MAF which is commonly available through many parts counters. they might not have an official record of the Jaguar installations for the reasons stated above. surely though they can match it from a part number.
Last edited by CorStevens; Feb 28, 2019 at 01:54 PM. Reason: additions
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From: Nevada, USA
yes, that is why it is better to contact them directly as described in my last post. with a part number they should be able to identify their own product.