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If it will shift when the engine is off, but not while it is running your clutch is not working
If you have bleed the system and If it will not go into gear with the engine running, the clutch pressure plate may have failed.
synchro plates went out
The brake pedal has to be fully depressed for the stick to engage.
If second is the only gear that does not work, there is an internal failure. The transmission will need repaired or replaced.
get a new engine DUMMY!
friction plate stuck to flywheel - In Open space Start car and allow to reach normal running temperature . Turn off engage first gear leave clutch pedal . Keep starting and stopping engine until friction plate releases.. Or maybe completely worn out usual sign is burning smell .
Switch to 4th gear!
if your talking about when your cranking the engine over with the cap off, then you have a broken distributor gear or shaft or bad camshaft gear.
sounds like transmission problem it could be the lever but likely that the teeth on the gear for forward is strip and wont engage...take it to mechanic or take the crankcase transmission case off and play with the gear back and forth to see what its supposed to engage and look at the gear replace if needed...trust me its worth it to do it youself and its pretty easy..just takes some time prolly an 1.5hour!!
Whatever the car, it has to do with the clutch. If the clutch does not dis-engage the fly wheel, you will be unable to shift or even get it into gear. Check you clutch, pedal, cable, or hydraulic system.
It won't hurt. As long as the engine is running the transmission fluid is being circulated, keeping everything lubricated and the fluid cooled. As to if you will actually get better fuel consumption or not, I can't say. Out of gear the engine will use fuel, and in gear it wont. In gear the engine will slow the car down, and out of gear it won't. Which of the two above will give better mileage?