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Discussion Starter #1
Why do the revs slightly increase when the clutch pedal starts to be released and before the clutch gets close to biting? Seems like an odd thing to happen.
 

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It's because the ecu thinks your engine is gonna stall due to the increased load on the engine so it adds extra fuel to try to keep the engine going, our antara and my diesel corsa does it too.
A diesel megane I've driven does the samething. Nothing to worry about
 

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Spot on Big Jason modern anti stall device.

ECU regulates fuel delivery bytaking into account a number offactors from the engine and the surroundings - such as inlet air pressure andtemperature, intake air flow, coolant temperature and the throttle pedal position . The ECU improves drivability by taking inputs from the clutch, brake and throttle pedal to smooth out gear changes and reduce driveline shunt.
 

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Discussion Starter #6
The clutch hasn't even bitten as it increases. Subtle, but off-putting as instinctively you should hear the revs drop as you get ready on the accelerator.

It's not something I'm doing, I know how cars should respond when pulling away. Just another quirk of modern diesels that should never have been messed with.
 

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Also on modern petrols
 

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Discussion Starter #8
HoneyMonster said:
ECU regulates fuel delivery bytaking into account a number offactors from the engine and the surroundings - such as inlet air pressure andtemperature, intake air flow, coolant temperature and the throttle pedal position . The ECU improves drivability by taking inputs from the clutch, brake and throttle pedal to smooth out gear changes and reduce driveline shunt.

Cool, but that extra 100 rpm will put slightly more stress on clutch as it's higher than it would have been.


I don't believe the anti stall thing as I've never (ever!) stalled a diesel before this one. Maybe if they got the gear ratios right there would be need for these small subtle fixes. It does lack low down torque for the gear ratios.
 

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That write up was taken for generic ECUs not specifically GM, but same principles apply to most modern vehicles. As found similar references on GM, VAG ,Toyota, Landrover. So it just seems to be way that modern ecus are going both petrol and diesel.
 
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