SOURCE: engine code 95 jeep grand cherokee lerado
12 is a battery disconnect within the last 50 start cycles and 55 means the end of the diagnostic cycle. Basically the computer found nothing wrong. The 12 code may seem incorrect if you haven't disconnected the battery recently, but from my experience the 12 code shows up almost all the time regardless.
SOURCE: 2002 Jeep Grand Cherokee Lardo misfiring
You say you changed the cam sensor. A1391 code is a crank sensor on the top of the trans. bell housing.
SOURCE: 2001 Jeep Cherokee with 6 cylinder engine -- PO306 code cylinder
Plug, plug wire, plugged or open fuel injector. are the most likely.
SOURCE: 2004 Jeep Grand Cherokee. Keeps stalling, engine
P0505 means the whole Idle Control system, not only the IAM. Check all related sensors (i.e. crankshaft sensor). Check with a voltmeter direct at the connector of the IAM if you get any signal. Remove the IAM from the TB, connect him, let someone switch your ignition key to ON. The IAM need to drive in/out for a short time to find the right position. Hold the IAM near a hard part, that they cant drive out completely! If IAM works fine, check the fuel pressure, check and clean your TB ( if not done yet). If that doesn't work, come back again please
SOURCE: P0308 cylinder 8 misfire detected? How to repair?
Fuel injector cleaner commonly has a low success
rate, and will not help if it's more than one cylinder that is
missfiring. The fact that you have a "rattle" noise, leads me to beleive
the engine is not receiving fuel on one or more cylidners. If it is all
the cylinders, than the fuel pump may be the culprit, or the fuel pump
circuit. But if only one cylidner is missfiring than it is a possibly an
injector. A code P0300 refers to all cylinder missfires, and any code
between P0301-P0308 distinugiushes a particular cylinder.
Misfiring
1- a general electrical tune-up (spark plugs, wire set, cap &
rotor) is a basic start to cure this issue. Wiggle the dist shaft while
you are in there, if you have one.
2- Then a good carbon cleaning / throttle-body cleaning.
3- Vacuum leaks at any of the hoses that connect to the Intake
manifold; especially the MAP sensor connection.
4- If that does not help then the O2 sensor could be bad or drifting.
5- Funky coil/coil-packs
6- Theoretically a microsecond glitch in either the cam or crank
shaft sensors would cause this, but I am not aware of this as a typical
cause.
7- Lastly a funky PCM but again it is not common for this to cause
miss-firing.
Note for the V8 then also:
a) bad erg valve (this dilutes the combustion gases and hence raises
the combustion temp
b) a leaky plenum/Intake manifold gasket. Leaking Intake gasket
symptoms
Also can check the TSB 18-48-98 Ignition System Cross Fire/Secondary Ignition Wire Induction (Complete Version )
Hope help with this (remember rated this). Good luck and have a nice day.
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