Where is the crank position sensor and the ignition module ,coil pack at on a 1998 Pontiac Montana transport

What size engine . 3.1 or 3.4 Has two crankshaft position sensors
Crankshaft Position (CKP) Sensor (24X)
RH side of engine at end of crankshaf, behind harmonic balencer
Engine Controls Component Views
Engine Controls Connector End Views
Crankshaft Position (CKP) Sensor (7X)
Lower rear of engine
Ignition Control (IC) Module
Top center rear of engine coils are on top of ICM - ignition control module .

likely a bad crank sensor or bad ignition module, coil packs can go bad
to but not normally all three at the same time.if the coil packs look ok
then i would look at what tell it to fire witch is the crank sensor, the cam sensor should tell the injectors when to fire, but thats not to say they couldn't be linked in some vehicles needing singal from both for fuel
and fire to work. hope this helps

coils packs are a set of 2plugs that are fired by one coil.so if you have a 6 cyl you will have 3 coil packs.its unusuall that all coil packs go bad at once.your no start could be caused by an ignition module,crank sensor,computer,bad connections,bad wiring,even a fuel problem.there may be a code set in the computer that may help to find were ot start to diagnois.it will have to be checked out to pin point the area.

Hi.

The ICM is located under the hood, next to the coil pack and spark plug wires. Here the part: Pontiac Grand Am Ignition Control Module (ICM).

If you ar having distribution problem and misfire check also the crankshaft position sensor. It signal is used to control coils and sparks.

Sounds like a bad crank sensor or a bad ignition module. If you have a scanner that can read sensor data, you can crank the engine over and see if there is an "RPM" reading. If there is an RPM reading, then the crank sensor is good...Throw the module away. If there is no RPM, replace the crank sensor.

Check for spark, if no spark, check to see if you have rpm signal. if no signal that look at the crank sensor. crank sensor will give you a no spark, so will an ignition control module, the crank sensor is by the crank pulley, the control module is under your coils.

If you unplug the crank sensor at the module and measure the resistance of the crank sensor. (the yellow wire and the black wire) The resistance of the crank sensor should be 900-1200 ohms.

Well you hit all the major ones, could be crank position sensor, ignition module, a bad coil pack (it should have 3), you need to check that you have spark to each plug while the engine is turning over (!!!be careful as this will hurt if you get shocked!!!), this will rule out coil packs. if you have no spark to any plug your looking at a bad ingnition module (which is what the coil packs bolt to). Hope this gets you on the right track!

All coil packs are attached to ignition module. Then module should have two wires running to Crank Sensor. If there are 3, then one goes to tachometer

Under the coil pack, there is an ignition module.
Have a look to this link.


https://easyautodiagnostics.com/gm/3.8L/ignition-coil-pack-tests-1

Hope it helps.