fxmjr1

Hi ALL:
Need some assistance on my sons 2003 Grand Cherokee Overland, 4.7 V8

We have been throwing a few codes. p340 and p1391.

Short story.

It dies and these come on.
I have reader and do know it is the cam sensor.
Dealer has replaced it 3 times, it still throws the codes and stalls.

I finally replaced the PCM today myself with sucess.
Short lived.
Codes came back and it died.

Outside of replacing the sensor and PCM, what am I missing.

He is heading off to college in 2 weeks and I need this fixed.

Dealer stated they needed the car to die in front of them.

I did read a recall on the wiring on the 2002.

am I looking at wiring or is there something else?

Help very desperate on this. Any help will be greatly appreciated

Thanks for reading this.
Frank

lurk520

You may want to post in the XJ section. It gets more traffic.

ol"blue

Hey Frank, Welcome to CF. Which engine is in this WJ? You didn't list it in either one of your threads or in your Profile details either.

fxmjr1

Hi Ol"Blue.

The engine is a v8 4.7
Thanks for answering.

Frank

ol"blue

Hey Frank. The issue you're having may have something to do with the tone wheel attached to the right camshaft, or the camshaft itself having excessive play causing the intermittent problem, or a build-up of sludge deposits. Or the issue could be a frayed/broken wire. JMO
This info comes from the Factory Service Manual:
CAMSHAFT POSITION
SENSOR
DESCRIPTION - 4.7L
The Camshaft Position Sensor (CMP) on the 4.7L
V–8 engine is bolted to the front/top of the right cylinder
head (Fig. 4).
OPERATION - 4.7L
The CMP sensor contains a hall effect device called
a sync signal generator to generate a fuel sync signal.
This sync signal generator detects notches
located on a tonewheel. The tonewheel is located at
the front of the camshaft for the right cylinder head
(Fig. 5). As the tonewheel rotates, the notches pass
through the sync signal generator. The pattern of the
notches (viewed counter-clockwise from front of
engine) is: 1 notch, 2 notches, 3 notches, 3 notches, 2
notches 1 notch, 3 notches and 1 notch. The signal
from the CMP sensor is used in conjunction with the
crankshaft position sensor to differentiate between
fuel injection and spark events. It is also used to synchronize
the fuel injectors with their respective cylinders.
REMOVAL - 4.7L
The Camshaft Position Sensor (CMP) on the 4.7L
V–8 engine is bolted to the front/top of the right cylinder
head (Fig. 10).
It is easier to remove/install sensor from under
vehicle.
(1) Raise and support vehicle.
(2) Disconnect electrical connector at CMP sensor
(Fig. 10).
INSTALLATION - 4.7L
The Camshaft Position Sensor (CMP) on the 4.7L
V–8 engine is bolted to the front/top of the right cylinder
head (Fig. 10).
(1) Clean out machined hole in cylinder head.
(2) Apply a small amount of engine oil to sensor
o-ring.
(3) Install sensor into cylinder head with a slight
rocking action. Do not twist sensor into position as
damage to o-ring may result.
CAUTION: Before tightening sensor mounting bolt,
be sure sensor is completely flush to cylinder head.
If sensor is not flush, damage to sensor mounting
tang may result.
(4) Install mounting bolt and tighten to 12 N·m
(106 in. lbs.) torque.
(5) Connect electrical connector to sensor.
(6) Lower vehicle.

fxmjr1

Thank you very much for the information.
I will take this info to my dealer and see what they can do.

Any more information from the forum group will be appreciated.

Thanks again,

Frank

Willys55

Both these sensors are real easy to replace yourself, you can get them from local parts houses and save a bundle on the labor costs