Check waste gate and actuator.
2004 D2a TD5.
She has been running really well unless I accelerate hard?
So basically cruise on up to 110kph or about 2600rpm & all good, try to accelerate above 3000rpm & the car reves, drops reves reves, drops reves.
Try to build up speed quickly & the same thing. Also does it on hills, not that we have many.
Seems to rev to 3200 or so then drops back under 3000rpm.
It's like it's surging, revs up & down very quickly.
Not fun when overtaking!
What should I be looking at? I am thinking it's either a fuel or air problem?
Any help would be great.
Jonesfam
Check waste gate and actuator.
I had both of the Auto Td5 and Manual Td5 with this exact same problem.
My very first Auto Td5 was actually the problem of waste gate actuator at a wrong setting. You should trying to adjust it SEVERAL TIMES (in my case it took me about 50 times, and each time included a hill drive test) to get its right spot.
In my D2a Td5 Manual, the issue came from a bad MAF sensor. A replacement of VDO MAF sensor solved the issue (and I should mention that a cheap Chinese one from eBay wasted me $39 after just a day of use).
It'll very likely be one of the waste gate solenoid hoses either split or cracked. Cheap and easy to replace all three of them.
Cheers,
Mark F...
Vk3KW
2002 D2 Td5 auto - current AKA The Citrus Money Pit
2000 Disco 2 Td5 Manual - dead and gone
197? Range Rover - gone
1973 SWB SIII Diesel, 1968 SWB IIA Petrol, 195? SI Petrol - all gone
Outback Campers Sturt
http://jandmf.com
Or it can be the solenoid dead as well www.discovery2.co.uk / Waste Gate Modulator - Over boosting in many cases if the problem goes away with fuse F2(engine bay) removed you need new solenoid but on facelift that symptom can be caused by bad MAF as well so try with it unplugged first cos removing F2 will disable the MAF too
Discovery Td5 (2000), manual, tuned
Faulty MAF was the issue on my D2a,the symptoms were similar to the OP's.
Paul
D2,D2,D2a,D4,'09 Defender 110(sons), all moved on.
'56 S1,been in the family since...'56
Comes out of hibernation every few months for a run
A failed wastegate modulator on my MY99 caused the same problem - failed on the unlimited position so the ecm would cut fuel due to excessive boost pressure.
MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi
Easiest way to test that is bypass the modulator unit, run the hose from the turbo outlet pipe (small hose coming up from the side) directly to the turbo waste gate actuator and go for a drive.
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