Originally Posted by snooker
I also have a 2008 Hemi Overland that would stall randomly. Raising the engine wiring harness away from the coils has worked for some people but it did not work for me. What did work for me was replacing all 8 coils and all 16 spark plugs with original Mopar spark plugs. The Hemi is very sensitive to spark plugs and may not run well with aftermarket plugs. When replacing the spark plugs get the Champions only from the dealer. Although you can purchase Champion plugs from an auto parts store that have the same model #, they are different than the ones you get from the dealer and may cause stalling.
Hope this helps.
said. The correct Champion 570's will have a dark top electrode connection, not silver as you are probably used to seeing. If your local parts store has these, they are OK. Mine did. MOPAR has a StarCase on this apparent difference, but we have not heard from Champion why this is so.
When you change plugs, add a small dab
of dielectric gease to the inside of the rubber boot and the top electrode for ease of removal next time and a good electrical connection. Gap is 0.043" for the '08 WK 5.7L HEMI. Check each plug before installing, then torque to 12-15 ft-lb.
The tie-up is a band-aid fix, but not the root cause IMHO. Certainly can't hurt. Check your build date. For the '08 model year, seems to occur for WK's built in August 2007 or earlier. Mine is a SEPT 2007 build and has never done it.
Also, recommend you write a complaint to NTSB. Many others have done so. With enough complaints, maybe Jeep will be forced to resolve this issue formally. It affects '07 and early '08 5.7L HEMI's.