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Discussion Starter · #1 ·
At first it was a P0344 and a P0016. So the first thing I did was replace the Cam Sensor (Mopar) and then erased the codes. After two drive cycles the CEL came back with only the P0016 code. I also replaced the Crank sensor and did a relearn. I have inspected the wiring (have not done voltage tests) and it looked good. I had 3 occasional misfires on 1, 5, 8 at highway speeds, so I decided to do a spark plug change, coil inspection, and injector test for the misfires. Completed that and there are no more misfires, but still the code pops. I also had the dealership replace the oil and filter (synthetic). I have serviced regularly and the dealership has always done it for the record.

I was told by the dealership that it could be a bad VCT solenoid (Oil Control Valve). So I removed the Intake manifold and found the OCV to be missing screens and having broken plastic screen retainers. So I replaced the OCV. reset codes. It ran well for about 6-8 drive cycles, then the code popped again, P0016.

The engine has 180K mostly long steady highway miles 6-8 hours at a time. The engine runs well and does not stall. The MDS or ECO will quit when the code pops. There is a slight shake at idle. I am a bit perplexed, because I do not want to tear the front off the motor if timing chain or tensioner is not the issue. It starts up immediately. Runs through all gears fine and accelerates fine. At 55 mph the engine is at 1500 rpms. It will move into MDS mode on cruize. The code shows up after two to five drive cycles, usually, and always at around 900 -1000 rpms on deceleration with brake peddle depressed. Also I noticed the spark advance will show a 0 to -5 number on freeze frame when CEL comes on. spark advance is 12-40 degrees. Cam and crank sensors show they are insync. No scratches on the old Crank Sesor or Cam Sensor. No noise in engine, slight Ram tick.

The only thing I can think of now, is timing chain issues. I was told by someone I should check the difference between the cam/crank timing, but I do not know how to do this on my scan tool for sure. It does do bidirectional testing for Chrysler products. Before I rip the front end of the motor apart, I would like to find out those values. Also I would like to know what the spark advance at idle to highway speed should be. I also ran a phaser test and the engine seemed to react to each of the nine steps fine.

If you can help me with this, I would be so appreciative.
 

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Discussion Starter · #2 ·
Here is my gut feeling, the chain tensioner broke and when accelerating the engine is fine, but when decelerating the slow down cause a bit of slack in the timing for a split second, and drops just enough to be out of the proper range to cause the spark advance to show the negative number and throw the code. But I could be wrong. I am still waiting for an opinion or two. Do you think I am off target?
 

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Discussion Starter · #3 ·
Fixed issue. No replies, So I will be brief. Weak timing chain, tensioner and worn guide. Replaced and all is well.
 

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Fixed issue. No replies, So I will be brief. Weak timing chain, tensioner and worn guide. Replaced and all is well.
Thank you. I’ve had this exact same issue truck runs great and when the light comes on it sticks in fourth. Still runs good just won’t go past 4th. I will tear it back down to check the strength of the tensioner
 
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