How many engine mounts on a 2003 nissan altima 4 cyl

2006 Nissan Altima 2 5 rear motor mount swap
2006 Nissan Altima 2 5 rear motor mount swap Nissan Altima Engine Mount Replacement Bing Videos

2003 is same as 2006

Both the 4 cyl and 6 cyl engines have coil on plug ignition systems.
You have a coil on top of each spark plug.

As far as the crank sensor plug they are the same on those,altimas. and i think sentras too. i would take the old one or sensor with you and check other nissans,

No you dont.

Cylinder missfire defintly may need a coil. Get to a place and have soemone pull the code from the ecm and it should be easy to fix

Camshaft and crankshaft sensors are common failures on these vehicles and will give you those symptoms. Camshaft sensor is fairly easy to change (right on top on side of head on drivers side)
Crankshaft sensor is buried on backside of engine way down on the bottom.

The cam sensor is mounted in top of the engine on the right side of the engine where the tranny mounts. You have to remove the top cover of the engine to get to it. Remove the electrical connector from the sensor, there is a clip that holds the connector in place. Push down on the back of it and then pull back at the same time. Pull on the connector and not the wires, they are very small and will break. Remove the bolt holding the sensor. To remove the sensor by twisting and pull on it at the same time. Is the engine not running, why are you replacing the cam sensor?

The 2.5 and the 3.5 transmissions are the same except for the side cover where the output gears are. The 3.5 uses thicker gears. They were made in Decherd Tn. Also the bell housing is different. The starter for the 3.5 is mounted in the bell housing and the starter for the 2.5 is mounted to the block.

Under hood, center, front engine area, mounted on front lower driver side of engine