Engine over run

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timsmug4

timsmug4

Member
Posts
28
Location
Odiham
Hey guys, any ideas why the engine revs dont drop off for a couple of seconds when changing gear? doesnt do it every time and the only fault found in the garage was just a poor conection to the egr valve. And yes i am lifting my foot off the pedal! Thanks
 
Mine does that. They all do that sir. Nothing wrong with it, I think it's just a characteristic of the Puma engine. I soon got used to making slow lazy gear changes with foot completely off the throttle. I don't know, but guess its got a heavy flywheel that keeps the momentum on the engine a bit longer than "normal".
 
had one of theese before , after replacing clutch switch it was fine , only one i had driven though so dont know if they do it normally and this one was just worse
 
It's called "throttle hang" and is a design "feature". LR say it's to make it more car like to drive!
A remap l am told fixes it.
 
shaggydefender said:
had one of theese before , after replacing clutch switch it was fine , only one i had driven though so dont know if they do it normally and this one was just worse
Click to expand...
That must be worth a try, the ECU gets a digital signal from the clutch hydraulics to say the clutch is pressed you can see this with a Nanocom, I thought this was to prevent over revs when you dip the clutch.
 
The engine ECU does, as l posted above, keep the revs for a second after you take your foot off the gas.
However it should not increase the RPM or hold it for two seconds....although it can seem that long when you are not used to it.
 
lightning said:
The engine ECU does, as l posted above, keep the revs for a second after you take your foot off the gas.
However it should not increase the RPM or hold it for two seconds....although it can seem that long when you are not used to it.
Click to expand...
Quite honestly I cant see why they would do that, it will make gear changes even more difficult on the clunky LR box with the engine revving
Look Here :
http://workshop-manuals.com/landrover/defendertd5/engine_management_system/switch_clutch_pedal/
 
There were a few "why did Ford...." moments when l owned my Transit Connect!

A remap will cure the Defender tdci issue.
 
Well maybe, but the link I posted is the TD5 workshop manual, seems better to try and hold back and surge when you dip the clutch.
 
Yes you can drive around the "throttle hang" on the tdci.
I have driven a few Defender tdci and having owned a Transit Connect tdci it is not a problem for me as l am used to it.

I'd still get it remapped though! Try Mike at Dynachip.
 
Its not a drive around its a built in part of the control which senses the clutch being pressed then reacts as the load falls away quickly to prevent the engine surging .
That's why I thought shaggydefenders suggestion is pretty logical and would be easy to check, with a meter on the terminals, or even pretty cheap to change the switch as its often the case that intermittent faults don't seem to show up when you are testing them.
 
You have to drive around it in the sense that you have to alter your driving style in order to make it work properly.
Another "feature" that we don't need. No such feature, or need for it on the TD5.

Still, l guess my next Defender will be a tdci (there are loads of mint ones for sale if a bit expensive at the moment)

I wonder if prices will stay so high, or if they will fall in time.
 
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