2005 TJ 4.0 with P0344 camshaft position sensor code (anyone know where to get an OEM sensor?)


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drpete1023

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So, CEL comes on this afternoon after running a few miles, 90 degrees out, high humidity! Goes right away after a restart. I opened the hood and let me tell ya it is super hot in there!!!! The guy at wranglerfix said he knew all about the excessive heat issues on the factory OEM PCMs. 20 percent restocking fee, looks like my plan moving forward (and going to install some hood vents to move more air!).
 

rasband

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Just talked to them, 1149.00.
Yeah, the manual is pricey and it hurts a bit. However, this week I had a new issue and asked him about testing the PCM vs other ideas. He was open to having it come back to test it and was aware of an upcoming trip. I think it's a fuel delivery issue, so didn't bug him again on it.

My theory with the Jeep has been consistently to try to do it as right as I can, or have a clear path to get there. The other PCM options all seem like shots in the dark - Mark's seems to at least have a decent bit of light on the target.
 
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drpete1023

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Dangit!!!! Well, check engine light came back on. Jeep sputtered on the way to work. I have exhausted every effort I know with local shops and internet searches and my belief is that it is the cam shaft being worn. The engine has 125k babied miles on it but this is a problem in the 2005-2006 years it seems, along with the PCM issues with combining the ECM and TCM? Anyway, ATK motor, long block, 3 yr/unlimited mileage, timing chain cover is on and new oil pan too, delivered to my house is 1950.00. Local shop wants 1500.00 to remove and replace. The ATK company will also pay I think like 50.00 even to have engine removed and replaced should something happen to it during the warranty timeframe.
 

rasband

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my belief is that it is the cam shaft being worn.
Have you pulled the OPDA to get a look at the cam gear? It’s not terribly hard to do and you could validate your theory to make it more than just a belief. While it could have wear somewhere else, the usual spot that seems to cause this is the cam gear which is visible.

You need to get the engine to TDC (top dead center), pull the OPDA, and shine a flashlight in the hole to inspect the cam gears.
 
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drpete1023

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Have you pulled the OPDA to get a look at the cam gear? It’s not terribly hard to do and you could validate your theory to make it more than just a belief. While it could have wear somewhere else, the usual spot that seems to cause this is the cam gear which is visible.

You need to get the engine to TDC (top dead center), pull the OPDA, and shine a flashlight in the hole to inspect the cam gears.
The first shop looked and said it had some wear on it but they were not sure if that was causing the problem. Took to the dealership and they looked inside and said that was the problem, 2500.00 parts and materials! I have low compression on cylinder 3 which is the same cylinder I guess the injector and fuel get vaporized and a tsb out on that that I never got, so between that, a motor with 125k miles, worn parts in it I am sure, seems now is the time to pull it.
 
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drpete1023

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Drove to work last week, almost an entire week without a check engine light, then it came on Monday, then stumbled once driving, sputtered during a startup, drove today with no CEL, and drove fine! Uhhhhhhhh!
 

rasband

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Drove to work last week, almost an entire week without a check engine light, then it came on Monday, then stumbled once driving, sputtered during a startup, drove today with no CEL, and drove fine! Uhhhhhhhh!
Is it weather dependent at all? Have you inspected your wiring?
 
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drpete1023

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Local shop said they looked at everything possible as it related to wiring....I looked, unable to find anything. I am now getting a squeal in the am for the first few miles after starting up (and it has a new ODPA as of just last yea in it), with sensor. Do not see any cuts in wiring anywhere but there is a ton of it as you know.
 
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drpete1023

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Is it weather dependent at all? Have you inspected your wiring?
Thinking about it, not sure it ever happens in the am (cooler, engine is cool, always high humidity in Mississippi), almost always when it is really hot outside!
 

rasband

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Do not see any cuts in wiring anywhere but there is a ton of it as you know.
Unfortunately I do, I dropped my skids and transmission as far as I could and inspected the loom all the way from the PCM to the rear drive shaft and behind the head. Recently I did the rest over the gas tank too!

Ultimately I replaced the CPS (a few times), CKPS (a few times), PCM, Fuel Pump Assembly, reoriented the OPDA, O2 sensors, TPS, cleaned the throttle body and all associates parts, and replaced my spark plugs.

If it’s heat related, I’d guess the computer (mine was way worse in the summer months, which is when things expand). My fuel pump was a new one after the PCM (which has been running great otherwise).
 
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drpete1023

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Unfortunately I do, I dropped my skids and transmission as far as I could and inspected the loom all the way from the PCM to the rear drive shaft and behind the head. Recently I did the rest over the gas tank too!

Ultimately I replaced the CPS (a few times), CKPS (a few times), PCM, Fuel Pump Assembly, reoriented the OPDA, O2 sensors, TPS, cleaned the throttle body and all associates parts, and replaced my spark plugs.

If it’s heat related, I’d guess the computer (mine was way worse in the summer months, which is when things expand). My fuel pump was a new one after the PCM (which has been running great otherwise).
PCM was replaced in 2017, seemed to work for a while, got from Jeep dealer-refurbished of course. So, what was your actual problem PCM or worn crank shaft or wiring?
 

rasband

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PCM was replaced in 2017, seemed to work for a while, got from Jeep dealer-refurbished of course. So, what was your actual problem PCM or worn crank shaft or wiring?
PCM + Fuel Pump, my trip over the next 6 days will tell if there’s anything else...
 
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drpete1023

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PCM + Fuel Pump, my trip over the next 6 days will tell if there’s anything else...
Did you pull the ODPA and check that and the cam shaft for wear? It seems really weird that out of ALL the codes a PCM could throw, why would it focus on the Cam shaft position sensor and a P0340 code? Who did you get your PCM from again? I heard wrangler fix is kind of proprietary? Can you still read them properly when diagnosing?
 

rasband

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Did you pull the ODPA and check that and the cam shaft for wear? It seems really weird that out of ALL the codes a PCM could throw, why would it focus on the Cam shaft position sensor and a P0340 code? Who did you get your PCM from again? I heard wrangler fix is kind of proprietary? Can you still read them properly when diagnosing?
I did, fortunately my cam gear looked fine. I’m not sure why, but the FSM does have some things you can check to diagnose more as long as you have a multimeter. The sequence they document is mostly checking for shorts in the system.

I did WranglerFix - no complaints yet and it does seem to report everything I’d expect. I’ve not thrown any codes yet, so all I can say is the data that comes out aligns with what I generally expect.
 
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drpete1023

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Curious, so what is so special about "wranglerfix" PCMs for the 2005-2006 Jeep TJs? What are they doing compared to flagship or the other companies? 1149.00, and if not the problem, a 20 percent restocking fee? Asking before I try what may or may not work.
 

cpwolf

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This is a super long shot, but I've got an 05 TJ 4.0. I've got 110k on it now, but I was having issues somewhat similar (P0340) and randomly ran like someone suddenly dumped water in my fuel. I chased parts, was at my wits end, and a local Jeep shop said to look at getting a new fuel rail heat shield etc. I'm in Texas, so Hot like MS brother, and it happened in the heat. The fuel in the fuel rail will boil, you get vapor lock and start throwing codes etc and running like crap. I put on something like this and problem was solved.

For the amount of money and effort, may be worth a shot.

 
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rasband

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I’d give WranglerFix a call to ask specifics, he seemed honest with me about what else to check before I should order.