How do I change an intake exaust manafold - 2000 Pontiac Montana

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The oxygen sensors are located under the vehicle on the exaust manafold unless you are getting a certain code wich u should be getting if they are malfuctioning then it could be something else.have you change the fuel filter? It also might need a tune up new plugs wires air filter ext

you might have a blocked catalogue in your manafold systrm

check for restricted or stopped up catalytic converter.

How do you know the cam sensor is bad? You tested it how? Don't go by a code being set,you'll be wrong 50% of the time.

give these websites atry www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car wish you the best of luck Michigan Man.

The 4.6 does not have an traditional distributor. This year engine should have two coil packs located on the front of each valve cover. Each coil pack controls four cylinders. Some of the plug wires will cross over the front of the engine in a wire loom on top of the alternator. The spark plugs are located down in the intake manafold. they run beside the fuel rail on each side of the intake manafold where it joins to each head. You will need an extention at least 8 to 10 inches long to get at the spark plugs. The plug wire fit snuggly into the intake manafold and have an extention on them that connects to the spark plug.

Depending on which motor you have will determine how to change the pack. I am not familiar with the 4 cylender motors but I assume that they are in the open. If you have the V6 then you are in for a little work. There are 3 packs in the front of the motor that are easly accessable. You will see them right on top. The other 3 are hidden under the intake manafold. If you are certian that it is a pack from under the manafold, Cylenders 4,5, or 6. Then do a search on how to change the spark plugs and you will find a very good page on how to get that manafold off. You will need new upper gaskets after removing the manafold. The new pack, and you may want to throw a new set of spark plugs in while you are there. If you have close to 100k miles on it then I would recomend that you change them while the intake is off.

you have a cracked dis cap give it a complete tune up
of that doesnt help your timing gear needs replaced!!!!!!!

Are there studs or bolts on the front cylinder head? If there are bolts then secure the rear manifold first.Or replace the rear studs with bolts.