Thread: D2 1999 4ltr V8 rough running, to rich ETC ETC.

Sounds similar to an issue I am having with mine just now.
Do you have excessive pressure release when removing filler cap after a run? You can hear the tank on mine physically (cracking) as it re-expands from the pressure release. A hole through the filler cap helped heaps, but still getting the feel of a misfire when driving.

Keeping an eye on this thread....

Now that you mention it AussieAub, yes it does seem to suck more air in when i stop to fill it the last few months. Could be a good clue to the real problem.

I recently had a rich running issue with my D2a. It turned out to be the O2 sensors, or more correctly, one of the O2 sensors ( but I replaced both).
Replacing those fixed the running rich issue (rough idle when warm, rich smelling exhaust, excessive fuel use). Now it hesitates when accelerating off the mark, and Im hoping (cos Ive ordered a new one) it the MAF sensor.
Hope this helps.

Mine has new O2's too, both of them, and a relatively new MAF sensor.
Still have the prob....

I have replaced the MAF EddyEddys but that was at the start of what has been a so far long winded operation due to faults not being conclusive to the symptoms and i cant afford to replace everything that could possibly be causing the problem. I know there is a faulty o2 sensor but the system registers the fault then runs a slightly rich default setting that shouldn't cause any issues with the running of the car. The car had a slight hesitation for a little while before these problems surfaced but again a very capable local land rover mechanic couldn't pin-point the problem so we decided not to throw money at it. I think the key to my problem is the fact that the car runs without miss-fire or noticeable power loss while the car is cold. As soon as the car is warm there is a sudden power drop like the ignition is retarded or the car is flooded and then it starts to miss-fire and idle very rough to the point of stalling even while driving. So far the car has Restarted within one or two tries but the symptoms persist from then on. I just cant work out what changes in the system between cold and warmed up.

When mine did this it was a faulty MAF sensor.
Needed an engine adaptive learning reset to forget the old bad settings using the nanocom.
It's in the utility section of the engine menu
This link has info on page 16 http://www.nanocom-diagnostics.com/d...1926603448.pdf

Thanks Rangeyrover. will talk to the independents about having the adaptive learning reset.
Hopefully that will make some difference since nothing else has.

Let us know how you go please mate?