Jeep TrackHawk Forum banner
1 - 15 of 15 Posts

·
Registered
Joined
·
9 Posts
Discussion Starter · #1 ·
Hello all! Joining some of the forums outside of Facebook seeking some additional help. I'll provide a link to that post as well as it's a bit lengthy, I'll keep it short(er) here.

I'm getting a rough idle accompanied with a P0300 code. Jeep drives fine but obviously want to resolve the issue and not risk long term damage.

My rig: 2021 Trackhawk, ordered June of '21 and took delivery in September. Currently at 5478 miles. Modifications include a GT Haus cat back exhaust (installed at ~1500 miles), Legmaker intake (installed at ~2500 miles, Billet Technology catch can (installed ~50 miles), and Ravelco anti theft unit (installed at ~150 miles). PCM is unmodified on the stock tune. Always fueled with 93 at a Sunoco or other top tier station, and always watch them press the button due to some mild OCD and paranoia.

Timeline of Events:
DATEEVENT/DESCRIPTION
5/24CEL first appeared after making a couple stops at stores on the way home from work. Before light appeared, I had notice a bit of a rough idle to the point where the truck sounded like it was cammed. After CEL, truck driven home at highway speeds, no harsh acceleration of aggressive driving. Catch Can removed per FB recommendation related to possible vacuum leak.
5/25Called dealer to schedule appointment for CEL Diagnosis and oil change.
5/26Dealer dropped off prior to opening for service. Dealer called mid morning and first impression was a PCM issue. Did inquire about the aftermarket exhaust and requested remote to close/open muffler valves. Wife dropped off remote during lunch break. Dealer also questioned aftermarket "alarm" system. Explanation provide for the functionality of Ravelco.
5/27Dealer had advised no change in misfire with exhaust valves open or closed. Commented that the misfire only occurs while idling and not tied to a specific cylinder.
5/28Vehicle collected from dealer for long weekend after advised that there appears to be no risk of catastrophic failure.
5/29 - 5/3010 gallons of new fuel from different station added to the roughly 1/4 tank still in vehicle. CEL did not appear but rough idle still noted. Additional code for C0572 also appeared at this time. Vehicle parked for weekend and was not driven.
5/31Vehicle was returned to the dealer at opening for further diagnosis. Loaner vehicle requested if vehicle was going to be at dealer for additional time.
6/1 - 6/6Dealer continued diagnosis and system testing. Complete list of tests not provided but was noted that fuel quality had been tested and passed.
6/6Dealer advised that loaner vehicle was not available and root cause for misfire not identified. C0572 code still present advised to be related to unplugging of harnesses during diagnosis. Was advised to drive and monitor. Post collection, vehicle filled with full tank of 93 fuel and bottle of Techtron Fuel System cleaner.
6/7 - 6/10Vehicle driven without incident totaling ~150 miles. CEL remained off but code for C0572 persisted
6/11Battery unplugged in an attempt to clear C0572 code. Reconnected battery and drove vehicle for weekend errands in the area. After visiting a local Lowes nearby to the dealer, I stopped in to update on condition. Advised service agent that CEL had not reappeared all week and attributed the CEL to possible bad gas. As vehicle was exited the dealer, CEL re-appeared. Updated service agent and was told to drop off on Monday.
6/12After market air intake removed and replaced with OEM unit. Battery again disconnected to clear codes and reset parameters. CEL reappeared and issue persisted.
6/13Vehicle was returned to the dealer at opening for further diagnosis. Loaner vehicle was again requested if vehicle was going to be at dealer for additional time.
6/14STAR ticket opened stating CEL and rough idle. Star responds to check exhaust timing then proceed to smoke test through brake booster hose and introduce propane through IAT sensor opening while running.
6/15Dealer updates misfire persists and timing at 0.4 degrees retarded. STAR advised to check purge valve and run compression test while vehicle running, then to check airflow through exhaust at TDC. Dealer advised that attempted cam phaser cleaning. Vaccuum needle from equipment fluctuates but tech questions 12 year old gaugef.
6/20Dealer updates that exhaust phaser cleaned, scoped cylinder and found no signs of damage. no leak down found on Cylinders 6,7 or 1,2. New vacuum gauge validates 15-17 hg with no fluctuation. STAR recommends cooling system check. Dealer advises no overheating issue, none of the plugs or pistons look "clean" and still misfires in P or N but not in D or R, normal and aggressive driving. Dealer inquires about catalytic converter restriction. STAR recommends reinstalling factory exhaust and re-evaluate concern. Service manager called and advised that likely culprit is the aftermarket exhaust. Vehicle was picked up same day and I swapped the exhaust to the factory unit in home garage. Battery disconnected during installation. Upon completion ~20 start/stop cycles before CEL reappeared.
6/21Vehicle returned at opening and again requested loaner vehicle.
6/21 -6/25Vehicle sat without further diagnosis - No STAR response
6/25Loaner vehicle granted and collected from dealership
6/27 -7/4Vehicle sat without further diagnosis - No STAR response
7/5Dealer advised that additional testing performed to check Air/Fuel condition which appears normal. Star case advised to be commented on and will be re-opened. Internal recommendation from another tech to remove valve covers to investigate any sort of mechanical failure.



List of possible areas to investigate I've given dealer (I'm sure I'm forgetting some as it was a last minute handwritten note):


Quality
Pressure
Sending Unit/Fuel Pump
Injectors
Spark Plugs
Vacuum Leak
Throttle Body
Coil Packs
Cam/Lifters
Valve Seal
Leaking Intercooler
Bent Valve
Valve Seal

Link to FB post: Facebook Forum Posting

Trying to see if anyone has had a similar issue or possible additional areas to try. I don't want to go lemon law route. At this point I just want the Jeep fixed. Thanks in advance for the assistance!
Wheel Sky Tire Vehicle Car
 

·
Premium Member
2019, Jeep, Trackhawk, Granite Crystal
Joined
·
333 Posts
Nice detailed write up about your situation. How long after installing aftermarket parts and alarm did you start having issues? How about checking the Ravelco installation. There are a couple of members which have had bad work done by Ravelco.
 

·
Registered
Joined
·
389 Posts
First thing that came to my mind when I read this, was Spark Plugs, Coils and Cats might be clogged. Have they replaced any of those? Even if they look ok, I would replace Spark Plugs and Coil if money is no issue to you. Than check Cats while you're at it.
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #4 ·
Nice detailed write up about your situation. How long after installing aftermarket parts and alarm did you start having issues? How about checking the Ravelco installation. There are a couple of members which have had bad work done by Ravelco.
I'll have to add that to my timeline too. Chuck W did come back out to give it a once over and is 100% certain it's not the Ravelco. I would think if it was a bad connection or faulty unit that The jeep wouldn't run at all, or would be misfiring in drive too. I haven't read anything about concern over the actual installation on these, aside from some dispute over mounting location and messed up panels. I've got no complaints with mine at all and would recommend Chuck as well.

Also it's been about 5 months since any type of aftermarket item has been added, last being the LMI. Everything else was installed closer to the time I took delivery, about 9 months ago at this point. Truck currently has about 5500 miles for comparison to the installation mileage above.

Thanks!
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #5 ·
First thing that came to my mind when I read this, was Spark Plugs, Coils and Cats might be clogged. Have they replaced any of those? Even if they look ok, I would replace Spark Plugs and Coil if money is no issue to you. Than check Cats while you're at it.
I may tell them to replace the plugs and I'll split the cost of it does not solve the problem. At this point it couldn't hurt and Id want peace of mind with new plugs anyway. Thanks!
 

·
Super Moderator
Joined
·
2,859 Posts
I'll have to add that to my timeline too. Chuck W did come back out to give it a once over and is 100% certain it's not the Ravelco. I would think if it was a bad connection or faulty unit that The jeep wouldn't run at all, or would be misfiring in drive too. I haven't read anything about concern over the actual installation on these, aside from some dispute over mounting location and messed up panels. I've got no complaints with mine at all and would recommend Chuck as well.

Also it's been about 5 months since any type of aftermarket item has been added, last being the LMI. Everything else was installed closer to the time I took delivery, about 9 months ago at this point. Truck currently has about 5500 miles for comparison to the installation mileage above.

Thanks!
Yeah, the Ravelco is not a complicated device. It just interrupts two circuits. The jeep will either turn on or you get a bunch of codes and it won’t even attempt to turn over.
 

·
Registered
Joined
·
9 Posts
Discussion Starter · #11 ·
Following up with some further updates below. At least we seem to be narrowing down some more details on the condition.

7/8Spoke with Girard at Jeep Customer Care and discussed car payment reimbursement. I will send a copy of statement and proof of payment. Also visited dealership and spoke with Chris L. Copy of latest star case opened on 8/8 provided. Star case summarizes previous tests and confirms P0300 still present. Fuel trims appear normal. Dealer believes could be either 1) bad catalytic converters, 2) faulty PCM, or 3) bad coil packs. Chris advised of notification to area manager requesting to begin replacing any of the above.
7/12Star agent recommends removing blower belt to monitor vacuum
7/15Dealer tried above test, no change to condition and vacuum measured at 19hg in both with and without accessory belt
7/18Star asking which cylinders are misfiring and if MAP and boost pressure sensor readings match mechanical gauge
7/20Dealer advise all 8 cylinders misfiring but not did not monitor MAP with belts removed. Star advised issue could be fuel pressure or cam timing (cam-phaser) alignment. Dealer advised fuel pressure between 57 - 65 PSI and agreed to remove timing cover to further inspect.
7/21Star questioned if fuel pressure matches desired parameters on scan tool and if both bank O2's running constant rich or lean.
7/23Vehicle picked up from dealer for the weekend to check grounds, relays/fuses/inspect. Broke and re-tightened engine bay grounds and applied dielectric grease to ASD fuse. Disconnected battery to reset adaptives and clear code.
7/24Refilled fuel and added Techtron fuel system cleaner. Drove approximately 70 miles and iniated several start/stop sequences before CEL re-appeared. Observed rough idle only in P or N as dealer previously advised. D and R no rough idle. Did not notice an RPM change between gears.
7/26Spoke with Chris L (Service Director) and Chris M (Technician) and reviewed concerns. Confirmed that computer validating misfire in P and N at idle only. Not misfiring while under load. Also confirmed he replaced ASD fuse at initial diagnosis. Could be cam phaser/cam timing, VVT Solenoid or possibly torque converter. Will follow Star direction to inspect cam phaser.
7/27Received update call from Girard at customer care. He spoke to Chris L at the dealer who advised Girard of our conversation on 7/26. Will provide next update on Friday 7/29 or Monday 8/1.
 

·
Premium Member
2019, Jeep, Trackhawk, Granite Crystal
Joined
·
333 Posts
No point in tearing down the engine just yet. Electrical issues sometimes have very wierd solutions specially today with how computerized everything is.

1: compression test
2: put a bore camera into each cylinder and have a look
3: has the engine wiring harness been looked over? I mean thoroughly looked over.
4: have you tried a new battery?
5: is you alternater working properly? Mainly because your problem is at idle.
 

·
Registered
'18 Rhino | Red Laguna
Joined
·
77 Posts
New PCM installed and programmed. No change to condition.
I've been following your posts on FB. What a weird problem.

Couple of thoughts....I doubt it's a coil due to the fact that ALL cylinders are misfiring.

I also doubt it's a mechanical failure within the heads, as a leak down test would have shown any issues.

At this point, if you desire to keep the TH and not lemon it, I would push for a harness replacement. To me, it sounds like you have a wire barely hanging on and the lower electrical current produced at idle is enough to "break" continuity of the wire due to resistance.

We see this all the time on aircraft where the wire looks okay on the outside to the naked eye. Once you ohms check it, the value is way high and well over 1 ohm. If they pin to pin the harness and check continuity, be sure they ohms check it and not a lazy continuity check...that really proves nothing in cases like this. Things need to be ohmed out to ensure resistance isn't too high.

Also, if they are checking voltage at a plug, make sure they reference the ground wire that plug uses (if there is one), and not run the multimeter to vehicle ground and bypass the harness. This action ensures the ground wire in the harness is good.
 
1 - 15 of 15 Posts
Top