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Is it normal for a 79 cj7 with a rebuilt motor and carb to get 3mpg at high altitude? It's running 31 at's on stock rims. The carbs set with the pins all the way tight.

First we fixed several gas leaks we found at the back near the opening to the tank, tightened up all the bolts on the carb(they were REAL loose) and cleaned it up real good following the tutorial on this site. Sometimes i still smell gas in the engine bay and canot find a single leak. Hoping thats normal for all 258's.

Next step is to fix the oil leak on the transmission and regrease and clean up the rear differential hopefully to solve it.

 

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/wwwthreads_images/icons/smile.gif No.....that's not right. The carb on that 258 is junk, and at high altitude it's even worse. You could do what a guy on this BBS just did and swap that carb for a Motorcraft Model 2150. That model has an altitude compensating aneroid. Those 2100 series carbs are so good that they refer to them as "poor man's fuel injection". We run the 2150 on our 304 CJ SNOJEEP because we used to climb 2500 feet in the last nine miles home each day to our former nest at 4500. We live at 3000 now, but still....../wwwthreads_images/icons/crazy.gif

CJDave
Quadra-Tracs modified While-U-Wait by the crack moonguy/wwwthreads_images/icons/wink.gif Quadra-Trac Team./wwwthreads_images/icons/tongue.gif/wwwthreads_images/icons/smile.gif
 

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/wwwthreads_images/icons/smile.gif You want to do the TR ignition upgrade instead of investing in a GM HEI. It's a much better way to go!/wwwthreads_images/icons/smile.gif You can do a search on this BBS for the data!/wwwthreads_images/icons/crazy.gif

CJDave
Quadra-Tracs modified While-U-Wait by the crack moonguy/wwwthreads_images/icons/wink.gif Quadra-Trac Team./wwwthreads_images/icons/tongue.gif/wwwthreads_images/icons/smile.gif
 
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I get 7 mpg with 33x12.50 m/t, 4.10 gears, and a 2 bbl weber carb. I am at 6,000 ft in colorado. So it has to be the carb. Maybe a tuneup would give a couple mpg too.

Jason


Jason
'86 CJ-7
3" Rancho lift, 33x12.5 Pro Comp M/T,
4.10 Gears, and locker in front, Weber, Rebuilt 258
 
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