When do I need to replace the timing belt? My

Watch the video. Also make sure you replace the water pump. Suzuki Forenza timing belt and water pump replacement part 1 of 2

Here you go

which of 5+engines is it?
we can not guess that.
is it accessory belt or cam belt, cant guess that either.
at least these>?

1.4 L E-TEC I4 (petrol)
1.6 L E-TEC I4 (petrol)
1.8 L Family II I4 (petrol)
2.0 L Family II I4 (petrol)
2.0 L RA 420 I4 (diesel)

the answer was on alldata.com USA, oops no country stated (FAIL)
and
at
https://suzukipitstopplus.com/Products/1027-2004-forenza-service-manual.aspx

all the time, every day, just look.

Squealing noises are more apt to be from belts, not mechanical parts. It doesn't necessarily have to be "a belt" per se, as the noise could, in part, be caused by an idler pulley. Open the hood and try to locate the sound. FYI I have posted the complete 2004 Forenza Service manual on FIXYA. Do a site search with those key words.

Hey Anon... there is no way for ANYONE on fixya to be able to tell what happened to your engine.. Find a mechanic you can trust and let him work on it... OR...

http://repair.chiltondiy.com/Pub/DIY/Product/2004-Suzuki-Forenza-repair-manual-online?ca=Repair&b=18074

http://repair.chiltondiy.com/Pub/DIY/Product/2004-Suzuki-Forenza-repair-manual-online?ca=Repair&b=18074

Sounds to me like the belt tensioner needs replacing.When you do this check all other idlers and water pump.Fit new belt..Good-luck....

its not done and its not an easy fix the cylinder head gasket needs to be checked and its kind of expensive to fix

A little more clarification would be nice, meaning, have you ever serviced the car other than oil changes? Bare minimum, do the timing belt, timing belt tensioner, the two timing belt idler pulleys, water pump, and spark plugs. VERY IMPORTANT NOTE: there are two designs for the water pump. Aftermarket water pumps will be a LOT cheaper, however, are the old design the majority of the time. Problem with the old design is the timing belt rides a bit on one edge of the pulley (not visibly noticeable) and you run the risk of the pulley on the water pump breaking after so many miles which will cause your timing to become out of synch, which results in internal engine damage (either a head job needing to be done or a new engine). A Suzuki dealer will have the undated design of the water pump, however, it is pricey ($302 plus tax).

With that being said, to tell if an aftermarket water pump is the correct design, look at the pulley and if the outer edge of the pulley is thinner than the inner edge, then you have the updated design. Usually aftermarket brands GMB and Gates will be correct.

If this helps, please indicate so! Thanks! :-)

it might be the idler on the tension adjuster inside the timing belt cover...if so replace it soon..it is a very vital part....hope this helps

Check this out...I hope it is a help to you! > http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?partName=Removal%26Installation&pageId=0900c1528019c687&partId=0900c1528019c687