Have 2001 pontiac montana bought it 15months ago these are my problems:intake manofold gasket is leaking i see small drops on floor sometimes big spots.my temp gauge,and gas gauge not working and engine light is on.for my temp gauge the needle is at 70 and when im driving the needle does not go up.for gas gauge while im driving the needle plays up and down so i dont know how much gas i have is this expensive to repair and is it woth to fix hope to get real answers plse write back as soon as possible
I had the same problem with my 2001 Pontiac Montana and the intake manifold gasket. This is a major problem with these 3.4L engines, if you are in the states I'm pretty sure there is a class action law suite against GM for this. I had my manifold gasket replaced and it was about $1000 CAD. You need to get your vehicle looked at right away as this could cause major engine damage, coolant will leak into the engine and soon enough you will be replacing that too. Good Luck
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If the gas gauge does not work correctly and the temp gauge reads hot, you could have a problem with the instrument panel. Both gauges get power from the same circuit, but each gauge is grounded by its own sending unit. If the temp gauge is reading correctly, you could have air in the cooling system and it is not actually full of liquid coolant.
you have a GM common problem and that is a bad intake manifold gasket. GM change the gaskets to plastic and they crank and leak causing over heating. here is a picture of one i took from a 2005 pon. bonneville with 74,000 miles on it
It could be a fuel issue or an air issue. There are so many different things it could be based on the symptoms. I would start with the fuel filter, if it contains trash it will restrict the flow of fuel to the engine especilly at higher RPM's when the engine need's it. Also, if the injectors are dirty they could restrict fuel also. If you have a leak in the intake manifold this would cause erratic running at higher RPM's also. Sometimes they are installed incorrectly. You can check this by letting the engine idle, have someone lightly press the accelerator (while it's in park of course) while you either spray ether or if you smoke, you can blow smoke into the engine bay near the intake and see if it's sucking the smoke up from some other spot rather than where it should be. Basically something foggy so you can see it being vacuumed from a leaky spot. This will even let you know if you have a vacuum leak. If all else fails try adding two small bottles of Lucas to your gas tank. It works wonders! Worth a shot.
remember new head bolts also, torque to yeild bolts. i would recommend
to get a service manual for torque specs and procidures for removal of
heads. also head gaskets are leaking for a reason have heads checked for
straightness and for cracks at local machine shop, keep all pushrods
and rockers numbered for reassembly, pushpods are different and will
cause major engine damage if mixed up.