No power at altitude

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Nay said:
It should rev higher than 2,500 RPM. That climb was not huge. ...
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If your not moving or the tires aren't spinning, then nope it shouldn't. The torque converter stall is ~2200 rpm, so that is all the faster the motor should run. Try it, start the rig, put it in drive, hold the brake, mat the throttle, if your torque converter/trans is on good condition the motor should only rev to ~2200 rpm.

Nay said:
If the feeling was pretty much like your high range hill climb attempt, I bet you weren't in first gear...
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Possible, if one or more trans shift solenoids are failing it can start in second. Even if setup for first and can do it intermittently, randomly at first.

Also possibly a clutch problem? My trans was always very soft, lots of shift slip. Adjusted the system pressure and the "kick down" cable, made a huge difference, much more solid. Now can easily spin all 4 tires on slick rock, against a ledge.:hillbilly:
 
SUMMIT CRUISERS said:
Last year I drove the Durango, CO to Ouray (550) with my 92 and a M-416 trailer loaded (probably about 850 lbs total). Power was so bad I had to use low, 2nd gear on most of the climbs up hill (pavement). This year I changed my fuel sock and pump because of lack of power and stuttering after driving about an hour this summer. That problem is fixed. Doing the same trip next month, I hope mine is better. Fuel sock was definitely sucked in, probably original (300K miles) and bad.
I'll definitely post my results on this thread at the end of July.
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Nay said:
You can look forward to 2nd gear high range this year :bounce::bounce2:
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x2

We just returned from a trip to Pagosa Springs, CO. We made the trek up Wolf Creek Pass, 10,800ft. Max speed up the hill - 35mph and in 2nd gear the whole way up. I'm on stock gears, 315's with a 3FE. Truck had 2 adults, 1 teen and 3 kids. Allowed me, as the driver, to enjoy the view as we climbed the 8 miles.

Learn where your truck's sweet spots are in rpm and manually shift into 3rd or second to keep the forward momentum. We used alot of 3rd gear on the trip there and back from Phoenix.
 
I would suggest that you check the fluid level in the tranny. You may be low and the fluid may be foaming up some. :hillbilly:
 
Did a quick and dirty check on the CC today. Didn't have access to low-pressure compressed air, so I just blew into the hose as lightly as I could. :hillbilly:



Per the FSM: Blow into the Tank pipe and air should flow without resistance out the other two.

My test: Blow into Tank pipe and air did NOT flow out of other pipes at all.



Per the FSM: Blow into Purge pipe and air should NOT flow out of other pipes.

My test: Blow into Purge pipe and air did NOT flow out of Tank pipe but did flow freely out of bottom vent line.



It would almost be correct if you switched "Purge" and "Tank" in the FSM tests. So does this mean my CC is bad?

On a side note , I am getting horrible fuel mileage (10mpg) no matter how I drive. Sometimes I can eek out 11mpg I get lucky but not very often. Would a bad CC cause this?
 
Could a plugged charcoal canister or excessive tank pressure cause the no power issue? IOW, are the two issues related (no power and high tank pressure)? Unfortunately, I only get up to that altitude about once a yeart, so it makes troubleshooing tough.

I wish I would have though to vent the tank and equalize the pressure once at altitude, but I didn't think of it :mad:. By the time I realized the tank was pressurized and vented it, I was on my way home..
 
This happened to me yesterday at about 6500 feet. When I turned the truck off I could smell gas (in addition to the lack of power). Popped the hood and the charcoal canister was hissing. So I opened the gas cap and let it vent. On the way back down it everything seemed fine.
 
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