Ive got a classic 2002 MAN TGA 460 Auto, which has developed a horrible problem of bunny hopping/jerking when you have slowed down in traffic or when you are starting off from stationary. It has become almost undriveable. If you can get it past this, it drives fine. So far the only way I have discovered to get round this is to put into crawler gear, then once its going put it into D3 or D5 and it is ok then. Has anyone come across this before. I am assuming its something to do with the gearbox.
The main reason why a lot of drivers detested the AS-Tronic gearbox, as it did just what you described from new.
Try putting it manual mode for the first two or three gear changes, after that it should go through the gears “smoothly”. Not sure if a software update would change a lot.
I’ve had it for 6 months and its never done it before. I got it from my mate who drove it all over Europe without issue. Strange how it’s suddenly started doing it. There are no error codes and putting it in manual mode doesn’t make any difference. I did see a post on here that suggested it could be the slow solenoid in the clutch actuator?
Theory was it would do a ‘soft’ reset on the computer. As I said it seemed to work on some(‘52 thru to ‘54 plates) but not always. The units were in the main double shifted (hard!) and if you could get 2 sensible drivers on 1 unit then it wasn’t a problem, it was the units driven by couldn’t give a toss drivers that struggled. Once we started getting ‘05 and ‘55 plates the problems were much less, whether the gubbins controlling the box had been improved, I don’t know, but I do know the drivers hadn’t! Some were so bad you had to floor the throttle to get them to pull away!
Whether it’s worth paying to get the memory on the computer cleaned I don’t know-it seemed as if the computer learned how it was been driven and came to expect the abuse!
That’s interesting. I was speaking to someone today who said that it had almost forget what to do! It was trying to give the full power of the engine as if it was in top gear when it was only in 4th!
What did the bad drivers do? How do you drive an automatic badly?
I have been wondering whether it needs plugging in and looking at.
I also wonder how drivers mange to ruin an auto gearbox.
Just press the pedal and away you go.
Maybe drivers use it in manual mode to get better scores on telematics etc.
Or maybe more than likely these days with ad blue issues. Drivers are driving along motorway in lower gear higher revs to burn off clean the dpf filer. And it causes gearbox problems
Some were so bad you had to floor the throttle to get them to pull away!