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on a 4 cyl is very easy, Nissan recommends replacement of both the crank and cam sensor together, but the crank sensor is in the back of the engine, near the transmission bell housing under the engine mount bracket. the cam sensor is in the back of the cylinder head and both have 1 bolt each, 10mm.
I would believe the problem lies with the CRANK POSITION SENSOR. The computer relies on that sensor to advance the timing when the engine is cold, once the engine warms up, the computer will ****** the timing and then the timing will be set in relation to the THROTTLE POSITION SENSOR. The crank position sensor costs aroung 30 to 40 dollars. But to have it installed will cost probably around $300...maybe more. To install the CPS you will need to jack up the front of the car, remove the passenger side front tire, remove the plastic splash guards, remove the serpintine belt, remove the harmonic balancer with a special puller designed for that type of engine, then finally, remove two little bolts holding on the sensor and replace it with a new one...........it all sounds pretty easy and straight forward, but really there is not too much room for tool movement and your body will be in an awkward position most of the time. I can do this job in about an hour and a half only because I have done it so many times and know exactly which tools are best suited for each particular bolt and the whole process, I would say it is a 3 hour job if you are very mechanically inclined or a 5 hour job for the first timer.. ,
Nissan has a crank and cam sensor kit. I would not buy any
aftermarket sensors because of the effort required to replace the
sensors. (I do not work for Nissan). The information below is compiled
of tips I found on the internet and my own experience. Even though these
procedures may appear lengthy, it took me much longer to figure out the
correct steps involved for this task.
Even though I have included all of the steps (and hints) I used... THIS IS NOT AN EASY JOB FOR THE "DO IT YOURSELFER"
CRANK SENSOR IS LOCATED AT FIRE WALL SIDE OF BLOCK BETWEEN MOTOR
MOUNT AND FLYWHEEL. YOU GET TO IT FROM TOP.
the biggest cause of that problem is a bad engine speed sensor {also called crank sensor but incorrectly] any way if engine speed cannot be read by computer then it wont ground the field, in other words it dont know the engine is runnig.
it is on the timing cover right on the edge of the balancer pulley
easy job and part is cheap to
usually all crankshaft sensors are located right next to the main drive pulley (Harmonic balancer). As far as being easy is concerned some are not so easy as some require the removal of the harmonic balancer to get to it.. but you might be lucky Gm is pretty good at making the Crankshaft sensor accessible without removing the harmonic balancer.
Crankshaft Position Sensor: Description and Operation
CKP SENSOR (POS)
Component Description
The crankshaft position sensor (POS) is located on the cylinder block rear housing facing the gear teeth (cogs) of the signal plate at the end of the
crankshaft. It detects the fluctuation of the engine revolution.
The sensor consists of a permanent magnet and Hall IC. When the engine is running, the high and low parts of the teeth cause the gap with the sensor
change.
The changing gap causes the magnetic field near the sensor to change.
Due to the changing magnetic field, the voltage from the sensor changes.
The ECM receives the voltage signal and detects the fluctuation of the engine revolution.
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