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Is it possible the clutch pedal is interfering with the throttle? Start the engine in neutral and allow it to idle. Press only the clutch pedal down and see if this increase the engine speed. If it does speed up the engine and slows back down when you release the clutch then somehow this operation is where your fault lies. If it doesn't alter the idle speed, then rev your engine and release the throttle to see if it returns to idle immediately. If it is slow to return to idle then your throttle cable could be sticking. This means when you change gear lifting off the throttle has little effect and depressing the clutch to change gear causes the engine to race as the throttle is still partially open.
do they revs drop off when taking pressure off accelerator pedal when out of gear? if only staying high during gear change it would suggest a worn clutch friction/pressure plate so the engine isn't slowing down when clutch is depressed .I'd also have the OBD codes read to see if there is a sensor/switch at fault , but sounds like the clutch to me
If I've understood your problem correctly.....when changing from 1st gear into second the box is giving a metal on metal crunching sound?
This would be the syncromesh ring which is not equalizing the speed correctly.
The problem usually happens when there is wear on the same part.
Check to make sure that the correct transmission fluid has been used in the box.
To alleviate the problem and delay the time when it will require attention, use the double de- clutch method of changing gears, especially when the transmission is cold.
The double de-clutch is carried out in the following way.
When in gear and changing from 1st gear to 2nd, change into neutral and release the clutch and then depress again before selecting 2nd gear....It is not required to rev the engine in the neutral position when changing up....
When changing down rev the engine when the shift lever is in neutral for each change.
You'll soon get the hang of it and stop the crunching sound, protecting the box at the same time....