W

Waitey

New Member
On a cruise at 70 it's doing 16mpg and needs a hell of a lot throttle to get it to accelerate.

It doesn't missfire though.

Im going to renew the airfilter and plugs, maybe a new maf too?

Anything else I should look into?
 
Engine breather pipes are known to disintegrate and reduce engine performance, they're located at the rear of the engine block

Matt
 
Odd thing is it does about 16mpg on normal use and is quick on kickdown. It just won't accelerate in gear on the motorway!
 
all of the above. i've gradually and incrementally changed plugs, fitted magnecor leads, changed all oils and filters, cleaned maf, adjusted stepper and replaced exhaust mid box, oh and started using better fuel too instead of supermarket pi$$. each step has improved performance and mpg a teensy bit but taken together its quite astonishing to realise how far below its ability the car was being forced to perform! nothing had actually failed but by simply ageing and no longer being optimum they were all robbing the car of performance. all those adverts that these plugs or that filter or some other lead will increase your HP are bollocks, what they do are restore power that was already there but had gotten lost. what you want to do is free the engine and drivetrain to run as it was intended to and you'll be surprised by the improvement.
 
I am returning 24.9mpg sat at 70 - 75mph.

How does this fair compared to others.

Still loving the rangie after my first week of ownership.
 
Definate 24.9mpg - 4.0litre P38 though not the newer one in the above post. (helps if I read things first)

I was watching it like a hawk driving it home when we brought it.
Averaging 17.2 at the moment to work and back.
 
jay140285 said:
Definate 24.9mpg - 4.0litre P38 though not the newer one in the above post. (helps if I read things first)

I was watching it like a hawk driving it home when we brought it.
Averaging 17.2 at the moment to work and back.
Click to expand...


is that going by wat the car says? or are you filling a certain amount then seeing how many miles you get from it and converting over?
 
jay140285 said:
Definate 24.9mpg - 4.0litre P38 though not the newer one in the above post. (helps if I read things first)

I was watching it like a hawk driving it home when we brought it.
Averaging 17.2 at the moment to work and back.
Click to expand...

The car calculated figure is notoriously inaccurate, 27/28mpg on the display equates to 24mpg in reality on my DHSE.
The only way to check is brim to brim and re-set the trip each time.
 
That doesn't seem too bad what you are getting, I drive a 4.6 v8 and get around 18 MPG at any speed between 50-70 with my tyres pumped up above average (35 front 40 back).
 
You must log in or register to reply here.

Similar threads

P
L322 Vogue 2006 4.4 V8 MAF/limp mode issues
Replies
9
Views
1K
peterself
P
Whatisthatmetric
Disco 1 D1 v8 Emissions, No ECU diag, and other mysteries
Replies
19
Views
2K
AllanWorms
AllanWorms
MAF Diver
Disco 2 Rough idle in a V8 D2a — tried MAF, O2, sparks, leads
2
Replies
35
Views
5K
marjon
marjon
MrGorsky
P38A 4.6 V8 won't pull, sluggish, otherwise runs fine.
5 6 7
Replies
135
Views
15K
MrGorsky
MrGorsky
D
High Idle on Startup & O2 Monitor Not Setting – 2002 Discovery 2 w/ Secondary Air
Replies
0
Views
424
disco_nap
D