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Re: timing belt broke
No, you can do it in the car, it just makes it a lot easier to do if you drop the motor out.
Space is at a premium in the motor bay, so you have to go through some pretty tight gymnastics if you do leave it in there.
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Loosen motor mount and use a jacck to lift up the engine a bit. Remove timing belt cover.After you remove the valve cover gasket, place a file or something in the grooves at the end of the cams to stop them from turning and loosing timing. remove timing belt and slip new belt on.
you can go to autozone dot com and register for free, the login, choose vehicle year make model, then choose to view your free online repair manual for your car.
Sounds much like a slipped timing belt or one with a tooth or two missing.
Since your engine is not an interference type, damage isn't awaiting you as with many other cars but if the belt has more than 60000 miles on it, it's time to change it.
Timing belt installation on many cars is pretty complicated as far as access is concerned so you might want to get a quote from a dealer.
If you want to DIY, check MR2 forums and you'll probably find help there.
It Could be A Number of things, Start by Checking for Vacuum Leaks at Intake manifold, Work your way OUT from there to the Various Vacuum LINES . Check FUEL DELIVERY Such as PRESSURE< FUEL FILTER, Fuel pressure REGULATOR All this Needs Checked
The only issue is if the valves were bent as this is an interference motor. There is no scheduled replacement of the tensioner. I would have the motor pressure tested before replacing the tensioner to make sure nothing else was affected when the tensioner broke.
Are you sure its no spark? It could also be a bad fuel pump... have you done a check for spark? If you pull one of the plugs out and lay it on the engine block and turn the car over a few times you don't see spark, or it just doesn't fire when it cranks?
I suggest you perform this test. If you see spark I can almost guarnatee that its a fuel pump issue.
Try this test if the one above passes. Pull off the intake hose (big thick hose attached to the throttle body) and spray in some starting fluid. If it cranks and tries to run but then dies, that suggests that there is no fuel getting to the motor which is usually a bad fuel pump as relays and fuses usually don't burn out on their own. These two tests should narrow it down pretty significantly. Hope this helps! Good Luck!