It should be fairly easy to check, on most cars the timing belt is only covered by a plastic cover. When you get the cover off you should see the belt it looks like a big chain. You need to find a way to mark one of the links {like a small piece of tape or a marker anything that you can use to see if that link makes a full rotation. Once you have it marked try to start they car have some watch for the link you marked to make a full rotation if it makes a complete rotation then it is not broken. If you get the cover off and can't find it you could have thrown it off if it was broken. Is it turning over and all the cylinders firing? What specific problems are you having with it? It can also jump time that would cause problems or it could have be slipping. Let me know more about and maybe I can help more. Remove the distributor cap. Turn the engine over and watch the rotor. If it does not move then either the cam is broken, chain is broken, or the distributor shaft or gears are broken. If the rotor does not move, mark the location of the distributor and remove it. If all is well with the distributor, then the cam or chain are broken. Either one will require you to remove the chain cover to find out for sure.
The 4.3 litre V6 engine in a 2003 Chevrolet Blazer has a timing CHAIN
The 4.3 liter V6 engine in a 1997 Chevy Blazer has a timing CHAIN
It does not have one. You can not use a timing light on that year engine. The timing is computer controled. You MUST have an engine scanner to set the timing.
It does not have a timing belt, That engine has a timing chain and gears and they normally last the life of the engine.
what engine?
When it go's out and the engine quits are when you can no longer set the timing with an engine scanner.
NO
Yes.
Behind the timing chain cover on the front of the engine.
You CANNOT use a timing light on that engine. ( won't work ) It requires an OBDII engine scanner to set the timing. The timing is computer controlled.
That requires the use of an OBDII engine scanner. The timing is electronic controlled and the OLD timing light will not work.
It is electronic controlled and requires an OBDII engine scanner to set the timing if it has a distributor. If it don't have 1 then there is NO adjustment for the timing. You did not give the engine size.