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Replacing the timing belt on an Interference engine, and doing it wrong, can cause serious problems. Busted piston, bent valve, cracked head, are a few.
Yes if the outside drive belts are over tightened after doing the timing belt it will pull up on the crank causing extra stress on the front bearing.
Not changing the transmission fluid in a car within 200K would cause problems.
On my 2002 1.6 Scenic it is at the aft end of the engine at the top of the bellhousing held in by 2 10mm bolts, they are around £23 for a replacement & are usually the cause of most intermittent starting problems on the scenic.
try changing both timing gears
Incorrect timing can cause several problems. One of which is high idling. 5000 rpm sounds high though, there may be other problems as well.
The most common cause for no compression after a timing belt change is improper timing. Make sure that tdc is set correctly, and is not 180 degrees out of sync.
No, an exhaust leak would have nothing to do with your engine timing.
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It's possible that changing birth control pills will change the timing of your next period.
In general, changing the computer will cause more problems than it solves. The computers seldom go bad.
Most suggest around 60K == Very important when changing a timing belt is to align marks and tension is correct. Its not just like changing a fan belt. Get it wrong and could cause thousands of damage to a modern motor.