CJ struggling at high RPM's - JeepForum.com
 
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post #1 of 8 Old 05-13-2010, 10:57 AM Thread Starter
cutlerdaddy
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1985 CJ7 
 
Join Date: Sep 2009
Location: Park City, UT
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CJ struggling at high RPM's

Hey,
I have an 85 CJ7 with a 4 spd manual trans. I live in Park City Ut and need to frequently climb hills on the freeway to get anywhere. When I hit any kind of hill the jeep just starts to quit on me. The more gas I give it the worse it gets. I cant keep it over 35 mph on the freeway which I think is dangerous. On flat ground it does just fine cruising around at 60-65mph. I dont expect to go fast I would just like to keep up with the semi trucks! The only think I can think of is that the Carb is bad or its not tuned correctly. I am not a very mechanical guy in figuring stuff out but I can, if told how, do most anything. Any help would be great.

Thanks,
Brandon

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post #2 of 8 Old 05-13-2010, 11:18 AM
Mike Romain
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1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant
Posts: 18,083
When was the last time it had a basic tune up?

Even just a blocked by dirt air filter can cause your symptoms, so can a fuel filter going bad or a dirty distributor cap and rotor.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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post #3 of 8 Old 05-13-2010, 02:15 PM Thread Starter
cutlerdaddy
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1985 CJ7 
 
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Location: Park City, UT
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Thanks Mike,
So in your experience I shouldnt be having this problem?
I will go ahead and change out the fuel filter, air filter, and distributor cap those things are simple and see if it helps. I purchased the Jeep in Sept 09 and the previous owner had the engine rebuilt in Dec 08. I was able to speak to the mechanic and even get a warranty on the engine. He told me that the all of those things were done but maybe they werent. It sat from Dec 08 until I bought it so maybe they need to be addressed again, not sure.
Thanks for your help I will do that stuff and post my results.
If anyone else has any more ideas that would be great.
Thanks,
Brandon
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post #4 of 8 Old 05-13-2010, 02:31 PM
scrapman
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1984 CJ7 
 
Join Date: Apr 2010
Location: Tyler, TX
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Search "team rush upgrade". It is a distributor cap upgrade and really helped my jeep run smoother and have more power on hills.

The upgrade uses a ford dist. cap and adapter to fit your jeep. You will also need to replace the wires and plugs. All part numbers can be found by searching the above phrase.
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post #5 of 8 Old 05-13-2010, 02:38 PM
jp360cj
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1977 CJ7 
 
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What size tires and gears are you running? big tires + high gears won't help your situation either

77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
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post #6 of 8 Old 05-13-2010, 02:54 PM Thread Starter
cutlerdaddy
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1985 CJ7 
 
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Location: Park City, UT
Posts: 4
Scrapman I'll check that out. thanks.

I am running 31x10.5 on 15's. I have no lift yet and I believe I still have the origninal gear setup. What ever that is. I know I should learn more about that.
Thanks
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post #7 of 8 Old 05-14-2010, 03:39 PM
baldfatdad
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1984 CJ8 
 
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Location: florida
Posts: 626
set mixture and timing for high altitude. get a manual. pretty easy to do. Climbing that hill out of SL is a hard pull. Watch your water temp. If its runnig hot, turn on the heater. if that helps, get the co0ling system checked.
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post #8 of 8 Old 05-15-2010, 04:39 AM
Mike Romain
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1986 CJ7 
 
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Quote:
Originally Posted by cutlerdaddy View Post
Thanks Mike,
So in your experience I shouldnt be having this problem?
I will go ahead and change out the fuel filter, air filter, and distributor cap those things are simple and see if it helps. I purchased the Jeep in Sept 09 and the previous owner had the engine rebuilt in Dec 08. I was able to speak to the mechanic and even get a warranty on the engine. He told me that the all of those things were done but maybe they werent. It sat from Dec 08 until I bought it so maybe they need to be addressed again, not sure.
Thanks for your help I will do that stuff and post my results.
If anyone else has any more ideas that would be great.
Thanks,
Brandon
The gas filters usually plug up fast and more than one, after they sit for a while so I would do that first before spending money needlessly. Be sure the smaller line off the level sitting gas filter sits at the top of it. It is there to blow vapors back to the tank on a hot shutdown rather than vaporlocking the gas line.

The modern gas rots out the lines from the insides and condensation gets in them also, both which cause rust flakes in the lines when they sit.

I normally expect to block 2 filters after getting a 'sitting for a long time' beast going and even keep a spare under my seat because they do plug up often if you off road.

They also get mud or dirt up behind the gas cap and some falls into my tank every time I fill up so I expect to use up filters when off roading lots. I live on a dirt and muddy road also.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos:
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