Originally Posted by chefalan23
i was told the hemi tick is normal and if you turn the tow/haul on or shift the autostick into 5th it will go away. unfortunatly it doesnt. im starting to think it really is an exhaust leek or something. whatever it is its annoying as hell when im driving with the windows down
FWIW, I developed the "HEMI tick" after 10-15K miles, -or- at least that's when I noticed it. After too many years of loud machinery, I now "feel" machinery behavior more than "hear" it.
I changed from dealer dino oil & MOPAR filter to Castrol Syntec full synthetic and K&N oil filter at 36K miles. Noted significant decrease in the HEMI tick. I'm always leary as to whether-or-not this might be a self-fulfilling expectation.
I have experienced a decrease in oil consumption with full synthetic oil. Used 2 qts every 5K miles before. About 1/2 of that now.
The key is the 5W-20 oil for proper MDS function. Interesting that my MDS has been misbehaving for a long time and the dealer cannot diagnose the root cause. Had to have O2 Sensor 1/1 replaced under warranty, and the same code (P0133) is back now. Now, the technician thinks it's an exhaust leak in driver's side manifold but needs Chrysler's OK to repair it under warranty. I can't see evidence of or hear the "leak".
Keep trying to tell them I have an electronic ghost running around in there since the MDS alternately functions and doesn't. Gas Mileage goes +/- 25%. I can clearly hear and feel when MDS kicks in & out. Coincides directly with the EVIC "FUEL SAVER" readout. Sometimes the idle is rough & uneven; other times it's perfectly smooth as an 8-cylinder engine should be.
Been pouring through these forums looking for some clues, but no joy so far. One interesting thing that the dealer passed on: Older cars with electronic controls had their components hard-wired into the appropriate control module. For instance, all motor sensors went to the Power Control Module. The WK Jeep has its functions wired into the closest node point, then into the CAN bus to communicate with the correct control module. Makes it much more difficult to figure out what's happening (...or not happening).
Did read about a restrictor plate inserted into the EGR valve outlet; it purports to cure the HEMI tick. I think if it were that simple, Chrysler would have done it a while back. Also, don't get caught with these aftermarket quick cures in place while at the dealer or Chrysler will deny any warranty coverage, then it becomes your $$ for diagnostics & repairs.
Just my $0.02 worth.