Puma holding revs

I believe the "hanging revs feature" was added to reduce the back lash (to a degree anyway). Having seen a few people drive my 2.2 Puma (using the clutch and accelerator like a "normal" vehicle) results in clanging back lash. By taking your foot off the accelerator, pushing the clutch in, let the hanging revs feature hold the revs while you change gears, releasing the clutch and do not use the accelerator until your clutch is fully up, will (after a little while) result in smooth gear changes and no back lash. Sometimes changing gears while driving down a steep road will still result in a "clang", but is more operator error (me) than anything else. Using the "revs hang period" to change gears takes a bit of practice, but I have noticed that back lash is more severe if changing gears too early. Don't rush the gear changes, it's not a sporty short-throw gear box of a something-or-other GTI...Don't drive a 2.2 Puma like a older type diesel engine, so gearing up at 1200-1500 rpm is too early, between 2200 and 2800 makes the whole process much smoother. These engines are much more modern than the exterior of the vehicle would make you believe, they like to rev higher and due to the much quieter interior of the Puma, the drive train noises become more pronounced than ever.
Driving a Defender: more smile per mile!
Cheers, Erik.

Hi Marcus,
I had a 2.4 Defender and it did not hold revs as you already know from your own driving experience when the vehicle is operating correctly. I now have a 2.2 Defender which does hold the revs in which it is designed to do. Although I am not a fan of this new feature, I have learned to live with it.

I had an EGR in my 2.4 Defender pack it in at 50,000km. In that case it did not result in rev hanging but did result in sluggish performance and lack of smoothness. Once replaced everything returned to normal.

Occasionally I had the revs hold on the 2.4 when I lifted off the throttle which was a little unsettling in city traffic. It only did it very occasionally and I never was able to diagnose it as a problem or just a "characteristic".

I would be interested to know what the cause is when you sort it.

Thanks guys,
As I said earlier, I dont think this is a "planned" feature. Sometimes its very quick, and sometimes it holds for a couple of seconds, and its only started doing it in the last couple of weeks.
I shall persivere and keep searching for answers. I'm doing a service in the next two weeks, so we'll see what happens with all new filters etc, and I'll clean the sensors again too.

I agree the hanging revs function is not always consistent. It's as though it's also attempting to be predictive at times. Sometimes it holds revs up longer than others. Sometimes on the down change, sometimes not.

Has anyone with a remap requested it turned off? Or anyone know if it is supposed to be predictive or adaptive to driving style at all?

Chops

It might be your clutch sensor switch. As many people would have noticed, the clutch fluid gets pretty polluted & black (might be a poor quality hose...dunno). Anyway, this can result in plugging or partial plugging of the narrow passage way to the sensor diaphragm chamber.

The sensor is supposed to reduce the "dashpot" effect & shock load on the clutch during changes. If it fouls up, it can result in the sensor sticking in odd positions...too much revs, or power loss.

They should be a pretty reliable part, so you could remove it and clean it, or just replace it. Not hard to do and relatively low cost to replace.

Cheers
Brid

Cheers Brid,
Funny you should bring that up. Chris (rangieman) and myself bled the clutch a couple of months ago and commented just how crappy it looked. Because it was during the week, we didn't have time to bleed it right out, so I might plan on doing that and see where it leads.
As you say, it can cause some mischief, which I had forgotten all about. That's part of the reason we did it in the first place, although, at this point, the clutch does feel good still, so maybe it'll help, maybe it won't.
Cheers

Chops did you sort this out in the end? Mine has been doing it, but could be related to a new remap I'm running as the issue started around the same time

Hi Cal,
I've actually replaced the whole unit, fixed the pedal squeak at the same time. All seems good at this point as far as pedal feel and revs go,, now looking to replace the actual actuator at the clutch in the next couple of weeks prior to selling the car ( we have the D4 now ;) )
I suspect once that's done, it'll be perfect again :D

I think I wrote some info in my build thread on it, with some extra info.

For what its worth.
My 2015 Puma does not have this hanging revs problem.
Nor did it have it after the BAS remap.

G'day everyone,
I have just purchased a 2010 Def 90 and will be picking it up this Friday. After reading these comments I'm thinking about trying to get my deposit back ....not really, but sweet Jesus what have I let myself in for?