Are you saying the engine will not crank unless you jump it off another battery ?
And when you do, is the alternator charging the battery when the engine is running ?
SOURCE: Changing the starter solenoid on a 2000 Pontiac Montana
On your van the solenoid is attached to the starter. If you can get a solenoid separate (i don't know if you can) then you will need to take the starter off and remove the solenoid (2 screws holding it on) and the wires (on red and one black i believe) pay attention to which wire goes where because you don't want to reverse it on the new solenoid.
SOURCE: Changing spark plugs in a 2000 Poitiac van.
There are a few ways to doing this, and it takes time and a few band aids. You can remove the alternator to give you some room to access the rear spark plug with an extension and swivel spark plug socket. You can also get to the plugs from under neath if you have a ramp and long arm, an extension and swivel spark plug socket will help. You may have to use a 2x4 to wedge the engine to give you some room if you have larger arms. The other way is to tilt the engine forward by disconnecting the two top engine mounts. First replace the 3 front plugs and wire one at a time so you don't cross them. After you have changed the front plugs have a friend help you. Make sure the parking brakes are on and disconnect the two top engine mounts, release the parking brakes and let the transmission in park. Push the van forward slowly to tilt the engine forward far enough to give you room with out pushing it to far in to the radiator. Put the parking brakes on again to keep the van from rolling back and place a block of wood behind and in front of the rear wheels. Don't want to lose an arm. Replace the rear plugs with extensions and a swivel spark plug socket. Note, your going to have to replace the spark plug wire since the rear ones are really hard to remove and pulling on then will destroy them, not worth the headache trying to save them. Use platinum plugs so you can get 100.000 miles before you have to change them again so use anti-seize on the plugs so you can remove them again. Good luck and hope this helps, I personally go from under the van.
SOURCE: changing sparks plugs in a 2000 pontiac montana
remove the ignition coil pack ( 2 10mm bolts on front of it and 2 13 mm nuts on the back side) u will need a long extension and deep socket for the back ones , and unplug all electrical connectors and remove it from the vehicle and you should be able to reach the back plugs without a problem.
SOURCE: 2000 pontiac montana doesn't start and security
Very common problem on these cars. Do you have another key you can use? Try it. If not take the key ou have been using and turn ket to the on posistion. Leave it there on for ten to fifteen minutes. The computer will relearn the chip code on key. When light stops blinking you know it is done. Turn key to off wait ten to fifteen seconds and turn key to on position, Security light may blink once or twice then it should stop.. Try to start vehicle. It should start. If it doesn't then you may need whats called a new passlock and possibly key reprogramming. Which can only be done at the dealer most of the time. Hope car starts with the first procedure. Let me know if it works.
Car not starting or turning over indicates towards multiple possibilities.
It can be issue with battery or weak battery. But if battery checks out ok, then
it can be starter issue or faulty alternator or problem with low fuel pressure
or no spark at spark plugs due to dirty spark plugs or faulty
ignition coil or injectors getting cracked or dirty and needs to be cleaned.
To confirm the problem, the basic troubleshooting is required.
Click this link below and follow the troubleshooting:------
http://technoanswers.blogspot.in/2012/02/car-starting-issues.html
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This will help.
Thanks.
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