1999 XKR misfire under hard acceleration. Help please?
#1
![Default](/forum/images/icons/icon1.gif)
Hi all,
Any help appreciated please:
Under hard acceleration my 1999 4.0 XKR misfires and stutters at approx' 3000rpm, effectively cutting my top speed to around 90mph.
It doesn't get through it, clearing the other side, it hovers around 90mph top wack.
This is in "drive", and it makes no difference if I am in standard mode or sport.
If I change gears manually via the J gate however, it charges right up to the rev limiter in second.....
I can't say if third and fourth misfire using the manual gearchange, because on the roads I tested it on it wouldn't have been particularly clever to go any faster!!
But in drive, it definitely misfires.
Anybody else come across this? No error codes showing.......
Thanks, Martin (UK)
Any help appreciated please:
Under hard acceleration my 1999 4.0 XKR misfires and stutters at approx' 3000rpm, effectively cutting my top speed to around 90mph.
It doesn't get through it, clearing the other side, it hovers around 90mph top wack.
This is in "drive", and it makes no difference if I am in standard mode or sport.
If I change gears manually via the J gate however, it charges right up to the rev limiter in second.....
I can't say if third and fourth misfire using the manual gearchange, because on the roads I tested it on it wouldn't have been particularly clever to go any faster!!
But in drive, it definitely misfires.
Anybody else come across this? No error codes showing.......
Thanks, Martin (UK)
#3
#4
#5
Join Date: Jan 2018
Location: on the road in NE Oklahoma
Posts: 2,837
Received 1,686 Likes
on
1,001 Posts
![Default](/forum/images/icons/icon1.gif)
That said, the generic sensors for the 4.0 XKR’s leave a lot to be desired. I could never get any aftermarket MAF sensor to properly adjust the trim numbers, and I tried 3 different ones. In desperation I bought the pricey Jaguar part from a dealer. End of trim number issues.
The MAF for the XKR’s is not the same as the one for the XK8’s. Many different manufacturers use the XK8 type, and the price is reasonable. On the other hand, only the XJR uses the MAF sensor used by the XKR, as far as my research found out, and it seems there is something special about the unit that the aftermarket types do not replicate.
Z
Thread
Thread Starter
Forum
Replies
Last Post
XKRRR
XK / XKR ( X150 )
18
08-25-2020 12:14 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)