P0344 Intermittent Camshaft (Relearn ?)

[Brendan]

2008 Jeep Liberty

I spent a week working on a crankshaft intermittent error and after replacing the the original sensor with another NAPA and not luck, i replaced Napa's with a BWD sensor and the problem is now gone

But now i have P0344 camshaft intermittent error, I had replaced the cam sensor along with the CK sensor so now i tried going back to the original sensor with no luck.

I can try another sensor but i read that i might need to do a re learn after replacing Crank or the cam sensor is this true? I'm also getting a P305 cylinder 5 misfire error which i never had before replacing the crank and cam sensor.

 

[LibertyTC]

The best advise I can offer is ONLY use Moapr sensors, the Jeep is really picky.
When was the last time you installed new spark plugs in the Jeep? Every 40k miles replace them.
Correct copper core plugs are : NGK ZFR6F-11 (Gap.043 in)

 

[Brendan]

Have not replaced them yet but not even 60.000 km on the jeep

 

[LibertyTC]

These coil packs fire plugs real hot.
I'd still replace them as the gaps get larger and then out of spec.

 

[Brendan]

I put the original cam sensor back in and cleared all the codes and put the battery cables together for a few hours and dont get the p344 error (interm cam sensor)
but am now getting p300 and p305 random /multiple cylinder misfire and cylinder 5 misfire

can this still be related to the cam sensor or bigger problems ?

 

[LibertyTC]

Can you confirm that you currently have the correct plugs in the KK right now ie: NGK ZFR6F-11 ???????
Misfires Random hmm...#5 cyl.. I would always start with new spark plugs correctly gapped at .043
Coil test..Could also move coil pack 5 to another location and see if it moves to a different cylinder, indicating faulty coil pack.
Then consider removing plug # 5 right now, measure & post the current gap and color condition etc, with a pic if possible.

 

[Brendan]

I will check, i am going to grab those plugs. i know the plugs in it have been in it since i got it at about 30,000 km and no issues from 30k to 60k. it had a melt down on the highway when my wife was driving and had a ton of errors but after towing home the only error was CKP so put new one in then the error was CKP intermittent. after checking all wires and 5 volts i bought another sensor (after the new one) and problem solved then it went to CMP interm error (already changed the sensor before) went back to the original and that error went away but now stuck with 300 and 305 all the time.

When it broke down it heavily overheated on my wife. when i got there it was still almost in the red, with all the small troubles i thought maybe PCM, but i wonder of the overheating would have done some heavy damage to the plugs and sensor

 

[LibertyTC]

I do not want to scare you however - Overheating is bad for any engine & a whole nother set of diagnostics ahead. Did the coolant boil up or over, steam present ??
Of the most major concern, blown head gaskets, with then the potential for oil mixing with the Hoat (zerex g-05) coolant, causing a messy gunk now into valvetrain.
Is the oil still clear, free of any bubbles, or milky substance on dpstick? I would do an oil & filter change irregardless, now.
Ensure that the electric cooling fan is working. With any A/C mode selected, the fan should come on.
What is the outside air temp where you are located?

 

[Brendan]

I'm worried about that also, the oil is dark black no bubbles or white. I had someone driving that isn't that smart, i know when i got there it was almost into the red on the temp gauge. I picked up a mopar camshaft sensor and some new plugs will swap them out and look at the old plugs. our temp is around 0 to minus 5 C. I suspect i have a fan issue while i had it running at home the temp goes to half way and yet the vents are still blowing cold air (maybe thermastat stuck closed). i will try to check the fan. but the first issue is to get it running and next figure out the temp problems. unless the temp issue is cuasing the misfires but i cant really see that.

 

[Brendan]

The more i think about it, the last time i had it running and it heated up to half way on the temp gauge i noticed that when i turn it off and came back out to look under the hood i noticed a fine mist sprayed all over the top of the engine had the hood up the whole time. and what looked a little puddle possible under the the front passenger side towards the of the engine. like i say i noticed the temp gauge showing hot but still cold air on the vents. i couldn't really tell the color of the puddle or spray if it was green or oil etc. head gasket would explain all the misfires but would that explain the CKP and CMP senors fails on the codes etc.

 

[LibertyTC]

There is a lot going on here. I have never let my Jeep oil get black, ever.
The smell of coolant is generally the first hint, look around the rad sides for a small crack or leak near or around hoses when up to a normal operating temp.
If the coolant was green you have the wrong coolant in the Jeep.
A pressure test from the rad or reservoir may help to find any coolant leak.
When cold over night, check the coolant level has the Hoat Level dropped? Have you had to top it up?

If the rad or reservoir (indicating leak or mixing with oil?) Make sure it is topped back up with hoat or zerex g-05 only.
Removing valve covers is the best way to tell if it is clean (no coolant mixed with oil) under the valve covers or a rocker may have fell off, causing misfire!
Pressure test & inspections ahead..

Sensors should be mopar, that is sorta the least of my concerns at the moment..
I'm still waiting to know what plugs are in there as well a a photo of plugs / gap info etc...

 

[Brendan]

I swapped out the plugs and they seem pretty black to me for a 60K car but it is a 2008. I changed out the cam sensor for a mopar no more interm CMP errors.

It actually seems to run worse then when the old plugs were in (if you can believe it). It will start after about 3-4 seconds rev for about 5 seconds to just above 1,000 RPM seconds then die out unless i give it gas. I can rev it above 4,000 RPM

I dont see anything in the oil or white smoke out the exhaust. but when i keep it running it seems to spray a fine shot of coolant i think somewhere around the belt. because i can see a small amount of spray on top if the engine and the belt is wet on the outside. the engine temp gauge is about 1/2 by this time and i still get no warm air out of the vent so not sure if i seized my water pump or a blocked thermostat.

after deleting and checking the errors about 6-7 times i get:

P300 Random misfire (everytime)

P325 Knock/Combustion Vibration Sensor 1 Circuit bank 1 or single sensor (only got this one time)
P305 Cylinder 5 misfire one time only ( i was getting this about 1/3 of the time before changing the plugs and i also swapped a coil with number 5 ..... assuming number 5 is at the back of the engine on the driver side.

I swapped the ASD relay with another one in the fuse box since there is about 5 of them in their.

I am running out of ides to try, read maybe O2 sensor, how can i confirm if its a head gasket or possible PCM etc

Any ideas what to try next ??

 

[Brendan]

I did have to top a bit of anti freeze not much though

 

[LibertyTC]

How much is not much? I quart hoat coolant added or?..Fix coolant leak/pressure test.
These plugs are super fouled. Rich mixture, injector issue or gunk in oil? I'd like to see under each valve cover.
You had the spark plugs for a KJ in there. Did you set the gap to .043 on each plug?
Have you changed the oil & filter yet? What drains out near the bottom of pan may be a hint IDK.
Engine compression test all 6 cylinders, find compression specifications.
View the engine firing order re moving #5.
Here is the 08 Factory service manual. https://drive.google.com/file/d/0BwxaBkrMP1bnQWhSUFlCU0JMejg/view

 

[Brendan]

thanks, i would say about a little less then a quart to top up