undrgnd wrote:
The only difference is that I let it idle for about 2 to 3 min before driving off now.
When you let it idle, be sure you place the transmission in
neutral for the idle time! It only takes about 30 seconds of idle time in neutral for the transmission oil pump to completely charge up/fill up all components and void spaces with transmission fluid. Revving up the motor is totally
unnecessary and is not good for a cold motor right after you first start it; idling in neutral is all that is required!
The reason why this happens:
When the transmission sets for a long period, some or most of the fluid in the oil cooler and oil cooler lines will drain back to the oil pan and when you first start the motor and immediately place it into drive or reverse to go, the pump must charge up the oil cooler and lines, thus the hesitation. When the transmission is in the PARK position, the transmission oil pump does not pump fluid until the gear shifter is placed in neutral or in one of the drive gears. That is how it is designed from the factory! It is also not wise on very hot days to leave the engine idling for long periods in PARK when the transmission is at operating temperature, if you must idle, place the transmission in neutral and apply the parking brake! That way fluid is being pumped through the oil cooler!
This is not just a Jeep thing, Dodge trucks do the same thing and as stated before Dodge even put a check valve in one of the oil cooler lines from the factory trying to prevent this phenomenon. Many Dodge owners have since removed the check valve due to they were prone to sticking...
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