Rattle/Grind after long uphill climb (4.0 WJ with 242) and p1494 code
I have a 2001 WJ Laredo with the 4.0 I6, and the 242 transfer case, with 127K miles.
I had the transmission rebuilt last year by a very reputable shop in town. It's run great ever since.
I live in South West Washington and it has been very hot here, twice we've experienced the following:
After a very long, steep uphill climb on forest roads (like gaining 2,000 feet of elevation in about 4 or 5 miles) the Jeep makes a grinding/rattling noise from the transmission or transfer case. Both times the Jeep was in 4 Full Time.
The first time my wife was driving with a friend and I wasn't in the car to hear it. For those of you that know the area, it was the road up to Silver Star mountain, and it was about 90 degrees out.
The second time I was driving, air temps were lower, in the high 70's or low 80's. Engine temp was right at 210, which is a little high for my Jeep, but it seemed reasonable, since we'd been doing a long uphill climb for several miles. I heard a grind/rattle from the transmission or transfer case area, that coincided with giving the Jeep more gas,and it didn't seem to want to respond to the throttle.
This was right before the summit of the road we were on, so we got outside, turned the car off and let it sit for a few minutes. It was fine the rest of the time.
All the fluids look good, and there's no leaks, hot smells etc.
Also, I've had an intermittent P1494 Leak Detection Pump code for the last couple weeks. I've made a cursory examination of my vacuum hoses, but haven't really dug into it.