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In the US many small municipalities have signs prohibiting the use of engine brakes in the city limits.
The downside of Jake Brakes is that they are noisy. So large commercial diesels can be fitted with a special linkage on the exhaust valves which will release the trapped air in the cylinders at top dead center, so called engine brakes or 'Jake Brakes'. This can cause problems with overheating and failure of the friction brakes if a diesel powered vehicle is going down a long incline. In a petrol engine at less than WOT (wide open throttle) the inlet manifold is at less than atmospheric pressure and this acts as a drag on the engine. The accelerator pedal in a diesel engine should nto really be called a throttle because it does not strangle the air inlet. The air flow into the cylinders is unrestricted. Diesels do not have a throttle valve in the air intake.
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Is this an odd feature of the XC90? If so it’s a feature I don’t like! This property of a compression ignition engine (aka diesel engine) is one of reasons why they are more efficient than spark ignition engines (petrol engines).ĭiesels are said to be free of pumping losses compared to petrol engines. So surely there can be no engine braking occurring? So surely there can be no engine braking occurring? Is this an odd feature of the XC90? If so it’s a feature I don’t like! On an aside when off the throttle whilst driving the revs drop as if you had dropped the clutch in a manual. On an aside when off the throttle whilst driving the revs drop as if you had dropped the clutch in a manual. I am hoping there might be a simple answer as to what causes this. The VIN is found on a sticker located on the driver's door and on a metal plate located at the bottom of the.
Download software aisin tf 80 sc manual manual#
It’s also recently been to Volvo for a health check and they have not picked up on any software updates or missed recalls.įree download af 40 tf80sc manual repair. I have had a gearbox oil change done but no change in fault occurring.
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However stopping the car, turning the engine off and on resets the problem (but not the fault code) A simple fault code reader gives the error “excessive clutch slippage” and you can clear the fault and reset the MIL light. Even coming to a complete stop it’s stuck in fourth. You can then not change gear using the geartronic leaver or force a change using kick down etc.
With the warning “Transmission Service Required” on the dash (and the yellow triangle). When driving enthusiastically, feathering the throttle (in preparation to overtake for example) or driving up a steep gradient there is sometimes a loud bang as the car puts itself into 4th gear. I have a MY05 XC90 Diesel with Automatic gearbox it’s done over 120k.