Going thru coolant like crazy but theres no leak. we done so much so far. we put a water pump in and a therpasat in and sencer in and intake gaskets

If the low coolant from the water pump leaking has caused the engine to overheat, then the cylinder head(s) can warp and the head gasket(s) will leak also.

Check your oil, you could have a blown gasket and it is going into the crankcase. If the stick is over the full mark, of if you let it drip onto a piece of plastic like a credit card or something and you see some bubbles or what looks like water droplet being displaced by the oil, you have a problem. Or if it looks foamy on the dipstick, as oil and water do not mix, they will separate or foam if the mixture has been churning in the motor for a while. If the car seem to run fairly decent, it could be a water pump gasket or intake manifold gasket if you do indeed find water in the oil.

Get your hands on a Chilton's, for your Grand Prix first. Read up on what is involved and go from there. Replacing the intake manifold is an involved job. You will need a set of E-Torxs, 3/8" and 1/4" sockets, a few short extensions, Coolant pressure tester, drain pans for the coolant, safety glasses (watch out fuel the fuel pressure while disconnecting the fuel lines), 3/8" torque wrench, tools to drill and tap possible broken manifold bolts, and the repair manual, for directions and torque specifications. The intake on this engine is plastic. They can get damaged if the engine over-heats. Remember to buy a complete gasket set for this repair. The old gaskets and O-rings must all be replaced. Do not try to reuse them exspecially the O-ring that seals between the intake and the injection module. Replace the thermostat while you are in there. Please let me know if this helps. Good luck.

All GM cars from 1994 to on up the 3100/3400 engine is famous for bad intake gaskets. When the gasket goes you loose coolant by either externally outside the engine or internally inside the engine. Check the oil for overfull condition and it will look like bright orange or milkshake color. Also if you drove on it overheating or if its full and overheats right away you also blew a head gasket. A compression test will confirm this. If you replace with good gaskets with the metal and rubber type do not use the plastic cheaper version. Then the intake gasket leak will never happen again.

The intake gasket could cause the MAF code and a rough idle when cold. But not the coolant issue. The intake is a dry intake. It doesn't have coolant running thru it. Check the water pump for leaks

well there are a few things that go wrong on this year and model. especially if its a 3.1.or 3.4, first off, intake manifold gasket may be leaking, check all around intake. mine did the same thing. if ok then check head gasket for leaks. if all is ok check water pump. if car is idleing, and you see coolant from releif hole that means the water pump seal is bad. it is possible for a water pump to be bad even if it is not leaking coolant. sometimes the fins on the back of the impeller, can corrode away. the only way to check is to remove pump. have a good day !!

Most likely internal head gasket leak, all 3.1L and 3.4L engines are notorious for intake gasket (external leak can be seen on either side of engine intake manifold) or head gasket leaking (usually internally). If it goes thru coolant and there is no obvious leak on the ground than its internally burning the coolant. If leaking on the ground check below water pump while running, it may be leaking also. Ultimately its probably head gaskets.

have your cooling system pressure tested, that should give a place to start as to where the leak is and how much it is going to cost to have the problem fixed

u got me there if u changed water pump and gasket making sure to snug the bolts u should be ok,as far as ur timming cover i dond see that just happening you know dosent make much sense waking up in the morning and overmight ur timming cover bent unlkess u do some rouigh driving and maybe over heated it or just got hot u would know more than me about that subject,go thru again and snug the bolts,start it with a flash light crawl under the truck and get a better look at thing maybe pressure wash the block first hope this helps u any

sounds like intake or water pump