Did you look above the oil filter mounting boss? The sensor is there on some quad 4 engines according to the Chilton book
You will fine it right on side of the starter on the front side of the motor
On a 1998 it is about 3/4 of the way down the drivers side of the motor (4 cyl.) Middle of the block.
According to the Haynes Manual it's located in the Water pump cover.
You have to remove the starter motor to view the sensor position Depends on which engine is fitted 4 cylinder 1.8 petrol is at the front of the engine at the flywheel end.
The crankshaft position sensor is on the top driver side of the transmission bell housing.
The location of the crankshaft position sensor depends on which engine the car has. If it is the 2.5L 4 cylinder engine the crankshaft position sensor is behind the ignition module. If it is the 2.8L V6 engine the crankshaft position sensor is on the side of the engine nearest the firewall and just above the pan rail in about the center of the block.
The timing is ground in the crankshaft and not adjustable.
It on the back of the coil packs going into the side of the block.
On the 2.8 V6 engine the crankshaft position sensor is near the bottom center of the block on the side nearest the firewall. On the 2.5L 4 cylinder engine the crankshaft position sensor is behind the ignition module below the intake manifold.
if it has a v6 it's behind crankshaft pulley,if its a 4 cyl.in the block
That is where the crankshaft position sensor goes.
I have a '95 grand am quad 4, 2.3 liter engine. The 2.3 quad 4 engine has the spark plugs underneath the ignition module cover, which is the cover that has "Quad 4" written on it. You have to remove this cover to get to the spark plugs. To remove the cover, you have to first unplug the negative batter cable and then unplug the crankshaft sensor from the ignition module housing. The cranshaft sensor is the plug that is to the top right of the ignition module housing. After you have unplugged the sensor, you have to unscrew the four bolts that are on top of the ignition module cover. After you've done that, you can lift the cover directly up. This disconnects it from the spark plugs. When purchasing new spark plugs, make sure you get the right ones for the engine, adn you can ask the guys at the shop to set the correct gap for you.