woodkrawler
NAXJA Forum User
- Location
- Charlotte, NC
Vehicle Info:
'99 MJ/XJ
4.7L Stroker w/850 miles
AW4 Tranny
Symptoms:
While driving home from the beach this weekend with the cruise on at 65mph the Jeep downshifts from OD to 3rd going up a long hill. Once it shifts to 3rd it begins to bogg down. RPMs wouldn't hardly go over 3K and the Jeep begins to lose speed. I kill the cruise control and recover speed around 50mph.
With the cruise off I continue to push the Jeep to rev higher than 3K with hardly any luck. :confused1 With the Jeep in Park or Neutral the engine will easily rev to red line. While moving in 4LO it will rev to well above 3K. After further testing tonight the problem only occurs at WOT. Under normal driving conditions it's everything is fine, but push the Jeep any and it struggles to get over 3K.
Tranny fluid and filter were just changed when engine was installed in June and I have "properly" checked it per the FSM and the level is fine.
Unplugged the TCU and all gears are fine, but it still won't rev above 3K.
I can only come up with 2 possible problems? Torque Converter is unlocking above 3K.
OR
Cat is clogged. New MagnaFlow Carsound cat was installed with engine install in June, however I've been running Hi-Zinc Comp Cams oil since break-in. Could it have clogged the cat within 850 miles? I have NOT had a CEL since day one.
What do you guys think?
'99 MJ/XJ
4.7L Stroker w/850 miles
AW4 Tranny
Symptoms:
While driving home from the beach this weekend with the cruise on at 65mph the Jeep downshifts from OD to 3rd going up a long hill. Once it shifts to 3rd it begins to bogg down. RPMs wouldn't hardly go over 3K and the Jeep begins to lose speed. I kill the cruise control and recover speed around 50mph.
With the cruise off I continue to push the Jeep to rev higher than 3K with hardly any luck. :confused1 With the Jeep in Park or Neutral the engine will easily rev to red line. While moving in 4LO it will rev to well above 3K. After further testing tonight the problem only occurs at WOT. Under normal driving conditions it's everything is fine, but push the Jeep any and it struggles to get over 3K.
Tranny fluid and filter were just changed when engine was installed in June and I have "properly" checked it per the FSM and the level is fine.
Unplugged the TCU and all gears are fine, but it still won't rev above 3K.
I can only come up with 2 possible problems? Torque Converter is unlocking above 3K.
OR
Cat is clogged. New MagnaFlow Carsound cat was installed with engine install in June, however I've been running Hi-Zinc Comp Cams oil since break-in. Could it have clogged the cat within 850 miles? I have NOT had a CEL since day one.
What do you guys think?