i need major help on this topic, i need to know how hard it is to change my theristat on a 2.8 tunned porte injection engine, what parts do i need to take off, where is it located or by??plz help me greg.......

Moved to the V6 Board. You have Multi-Port Fuel Injection BTW.

The thermostat is in the upper front of your engine. Just follow your upper radiator hose to where it goes into the engine. That's the thermostat housing. Remove air intake hose going into the TB to get it out of the way. I'm not sure if there's a radiator draincock, so i just pulled off the top of the hose at the radiator and lowered the coolant level enough that it didn't make too big of a mess down the front of the engine. Then removed the other end. The hardest part is getting wrenches or sockets down in there to pull out the two thermostat housing bolts. Make sure you have the small rubber o-ring type gasket instead of the full size gasket like i almost put on. You'll see when you get it off. When you retighten the housing don't go too tight or you'll break it. There's some wires that will be in the way too, I think I disconnected them or something, don't remember. You can also drill a small 1/8 hole in the new thermostat. That will help any trapped air get out.

There might be a few other parts in the way, i can't remember. The hardest part for me was just getting a wrench or socket in there.

Yep, torque spec for those bolts is only 12-15 ft/lbs... and if you don't have a torque wrench (and everyone should), that's not too tight at all... I'd describe it as slightly "snug".

The problem is that you're screwing a steel bolt into aluminum threads, and tightening down an aluminum water neck. So the aluminum threads can strip and the water neck could crack. Any steel bolt that goes into aluminum threads will have a light torque spec.

i just did this today actually on my 3.1 wasnt all that hard just took a bit to get everything taken off...just pay attention so that you dont break any hoses or wires as i broke one whoops. all in all not hard at all just follow the steps above

edit... a lont extension with a swivel makes the thermo bolts real easy to get off