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Old 06-24-2010, 06:20 AM   #1
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97 tj few small problems help

hey all, im new to jeeps as a sold mty s10 and just picked up a 97 tj last weekend for 5500 4 cyl with 5 speed has rear end locker and a few other extrs and 131k on it, now for the problems

i only get about 80 miles to a tank of gas. normal? i think the guy said it had 4.11 gears in it but he also said they were still factory i think.

when the engine is warm and ONLY when its warm it has to turn over alot more to start. when its a cool engine it cranks right of the bat any ideas? today i got to pick up a new rotor and cap i took the cap off last night to check it our and the metal piece fell off the rotor.

any ideas would be great thanks.

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Old 06-24-2010, 06:26 AM   #2
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the 4.11s are the factory gears for the 4 banger with 5 speeds.

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Old 06-24-2010, 06:45 AM   #3
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isthat for more torque? never been really big on gearing are the 4.11s gas eaters?
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Old 06-24-2010, 06:53 AM   #4
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Same problem with starting a warm engine

among a few other issues.

Just bought my 97 TJ last weekend....
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Old 06-24-2010, 07:11 AM   #5
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jolly whats wrong with tjs?
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Old 06-24-2010, 07:55 AM   #6
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isthat for more torque? never been really big on gearing are the 4.11s gas eaters?
The way I understand it, 4.11 gears with a 4 banger are to compensate for the power the engine doesn't put out. To my knowledge, all 4 bangers have 4.11 gears factory. Where as my straight 6 came with 3.07 because the engine puts out more power(Some straight 6's had a little lower gearing).

Having the "perfect" set up is good for both offroading and onroad(gas mileage). Rubicons are designed to be good offroad. For rock crawling in particular, slow and low gears with plenty of power is the way to go. On 31" tires, having the straight 6, 4.10 gears, and 4:1 TC(all of this factory on the Rubicon) is to give you that "perfect" set up. Even your tranny type has an effect, since most autos have less gears they typically will run deeper gears once you get larger tires(i.e. alot of TJ autos are 3 speed where alot of manuals are 5 or 6 speeds[6 speeds in the '05-'06 years]).

It all boils down to what tire size you want, what drivetrain you have/want, and what kind of driving(or offroading) you want to do.

Mud boggin', riding sand dunes, trail riding, rally racing, and other types of offroading also factor in to what gears/drivetrain you'll want.

Edit: someone correct me if I'm wrong please.
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Old 06-24-2010, 11:12 AM   #7
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If youare only getting 80 miles to a full tank, something is DEFINATELY wrong. Most get 200-280 out of a full tank. Is it throwing any codes?
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Old 06-24-2010, 11:20 AM   #8
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if you run 32-12.50s like i do on my 98 tj with a 2.5 you will get about 160 from a tank.
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Old 06-24-2010, 11:22 AM   #9
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80 miles to a tank is way wrong....start at the beginning and check everything or get it on a scope and see what is so far off. Welcome and good luck.
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Old 06-24-2010, 04:10 PM   #10
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no codes. runs great.just hard to start when the engine gets warmed up and hard to get it over 70MPH i say 80 just off the top of my head. i just filled up and drove 21 miles on this tank so far and i used a 1/4 tank. it will only hold 12 gallons? i didnt think the "extended filler hose" was on this model. i am watching mileage this tank to see the exact number. no lift stock tires. 4 cyl 5 spd. had a cold air intake and TB spacer on it when i bought it. has locker in rear end but like i said i believe the gears are factory. i drove it back when i bought it 4 hours on the interstate and used a whole tank had to fill up again to make it the rest of the way to my house.
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Old 06-24-2010, 04:19 PM   #11
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So say you were doing 65mph on your drive home... and 65x4(hrs that you drove) is 260 miles, before you had to fill up. Seems ok. Maybe you just have a heavy foot on regular roads.
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Old 06-24-2010, 05:30 PM   #12
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is being hard to get over 70 due to gearing? ok i guess the mileage seems normal from the research iv done. any guess in the starting problem?
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Old 06-24-2010, 05:48 PM   #13
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Gas leak?

FYI not all 4bangers came with 4.11's there that came with something around 3.53's I believe.
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Old 06-24-2010, 06:41 PM   #14
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is being hard to get over 70 due to gearing? ok i guess the mileage seems normal from the research iv done. any guess in the starting problem?
TJ's aren't speed racers, they are fun offroading machines.. And to answer your question, yes it is both your gearing and your engine size.
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Old 06-24-2010, 08:33 PM   #15
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Seems as if I remember reading on this forum that some Jeeps came with 15 gallon tanks as verses 19 gallons. Could be wrong but it could explain some of 80 miles per tank. Either that or some wrong numbers somewhere.
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Old 06-25-2010, 08:15 AM   #16
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got a new problem. the other day the jeep wouldnt start. took cap and rotor off and saw the metal on rotor had came off so i replaced both and still nothing, took a plug out and held it to ground and no spark jumps. so i was think of changed both the pickup coil and the regular coil? anything else before i drop another 60 bucks on those?

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