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Old 01-20-2011, 09:31 PM   #1
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Just wanted to say hello. I'm a new jeep owner. Always wanted one so I sold my full size dodge pickup and paid cash for my tj. So far I'm happy. Seems to not get a very high speed on highways. Was having trouble going faster than 60mph. So I went and got a new high flow cat put on since mine was kinda plugged. Was able to get going mid 70s right after. On way to work today I was struggling to go 65. I am blaming the wind resistance and cold weather since it is only 11 degrees and windy. Other than that I love it. Can't wait till summer to get here to take the top and doors off. I'll try to upload a picture later.

1998 jeep wrangler sport
4.0L manual

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Old 01-20-2011, 09:57 PM   #2
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Old 01-20-2011, 10:04 PM   #3
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Old 01-20-2011, 10:19 PM   #4
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Originally Posted by sallbd01 View Post
Just wanted to say hello. I'm a new jeep owner. Always wanted one so I sold my full size dodge pickup and paid cash for my tj. So far I'm happy. Seems to not get a very high speed on highways. Was having trouble going faster than 60mph. So I went and got a new high flow cat put on since mine was kinda plugged. Was able to get going mid 70s right after. On way to work today I was struggling to go 65. I am blaming the wind resistance and cold weather since it is only 11 degrees and windy. Other than that I love it. Can't wait till summer to get here to take the top and doors off. I'll try to upload a picture later.

1998 jeep wrangler sport
4.0L manual
Welcome! And there is something wrong goin on with your 4.0 if you cant get past 70 mph man, i got a 97 4.0 with 33's and go 85 easy...
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Old 01-20-2011, 10:38 PM   #5
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Welcome! And there is something wrong goin on with your 4.0 if you cant get past 70 mph man, i got a 97 4.0 with 33's and go 85 easy...
What would you check out next then? I haven't given it the tuneup like I should. If I change the plugs fuel and air filter will that help? I don't know a lot about vehicles. Just the basics. So not sure where to start.
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Old 01-20-2011, 11:13 PM   #6
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Whenever purchasing any car changing the plugs is always a good idea, most likely it's running on the same plugs since it was purchased new. As you stated, fuel and air are big keys to a smooth running ride as well so your on the right track man! Just give her some TLC, also you got any check engine lights on? O and always, always keep that thing lubed up with proper oil changes for the engines full life potential!
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Old 01-20-2011, 11:59 PM   #7
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Whenever purchasing any car changing the plugs is always a good idea, most likely it's running on the same plugs since it was purchased new. As you stated, fuel and air are big keys to a smooth running ride as well so your on the right track man! Just give her some TLC, also you got any check engine lights on? O and always, always keep that thing lubed up with proper oil changes for the engines full life potential!
I did get the oil changed right away with mobil high mileage. It has a cold air intake on it but it's not a k & n. Would those few things we discussed take power away from my tj and top speed? I appreciate all the help. Thanks.

And no I don't have any check engine lights on.
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Old 01-21-2011, 12:38 AM   #8
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I did get the oil changed right away with mobil high mileage. It has a cold air intake on it but it's not a k & n. Would those few things we discussed take power away from my tj and top speed? I appreciate all the help. Thanks.

And no I don't have any check engine lights on.
No missing out or anything like that? Checking your spark-plugs will be a good idea, and the actual spark plug wires as well. Just curious since you put in high mileage oil, what kind of mileage does your jeep have?
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Old 01-21-2011, 01:35 AM   #9
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No missing out or anything like that? Checking your spark-plugs will be a good idea, and the actual spark plug wires as well. Just curious since you put in high mileage oil, what kind of mileage does your jeep have?
It has 130k. Guy I got it from got it as a project for him an his boys. Has a lot of new parts inside. He said he only put 2000 miles on it in two years im guessing thats why my cat was plugged etc. Just needs broke back in. He said it had new plugs. But you can ne'er really be certain what they tell you is always true. It idles right around 800 rpm and seems to idle okay. Not sure what it would feel like if it was missing except maybe shake a little. I've notice a little shake every now and again but not much.
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Old 01-21-2011, 04:58 AM   #10
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Old 01-21-2011, 09:13 AM   #11
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I'm wondering if my gear setup has anything to do with it not having a high top speed. I can get it up to 77. I'm not sure what transmission or gear setup I have. I'd imagine stock. It is a 5speed. With 30" tires and no lift.
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Old 01-21-2011, 11:02 AM   #12
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I'm wondering if my gear setup has anything to do with it not having a high top speed. I can get it up to 77. I'm not sure what transmission or gear setup I have. I'd imagine stock. It is a 5speed. With 30" tires and no lift.
Ya that might have something to do with it to, that and not being drove as much as it should in the last few years. If it's stock gears you are either running 3.07 or 3.73, take a look at your differential cover and there should be a tag on it, looks something like this.

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Old 01-21-2011, 02:36 PM   #13
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Old 01-21-2011, 06:11 PM   #14
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Thanks for the welcomes.
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Old 01-21-2011, 07:42 PM   #15
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Old 01-22-2011, 08:26 AM   #16
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I went under my jeep to see if I could find what gears I had. I didn't see any ID on the axles. I notice I had a wet radiator hose with a little bit of antifreeze showing. But not enough to drip on my garage floor. Just something else to get checked out I guess. Would that cause me to lose power?
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Old 01-22-2011, 01:19 PM   #17
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If there was no I.D. on the axles it's possible that previous owners could have took it off because they had changed the gear ratio and it was no longer an accurate tag. Radiator hose that leaks over time could just cause overheating, therefore no power since you have to shut your engine off in times of overheating lol, but no, no power loss from that, sometime my radiator hose is a little wet too, but not enough to drip. So here's a way you can figure out your gear ratio, i think it's the easiest...Log your RPM at 60 MPH in a 1:1 transmission gear, so you will record your rpm while you are in 4th gear going 60mph. and then plug the numbers in the formula below:
RPM x tire diameter
------------------- = Gear ratio
60 x 336
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Old 01-22-2011, 01:37 PM   #18
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If there was no I.D. on the axles it's possible that previous owners could have took it off because they had changed the gear ratio and it was no longer an accurate tag. Radiator hose that leaks over time could just cause overheating, therefore no power since you have to shut your engine off in times of overheating lol, but no, no power loss from that, sometime my radiator hose is a little wet too, but not enough to drip. So here's a way you can figure out your gear ratio, i think it's the easiest...Log your RPM at 60 MPH in a 1:1 transmission gear, so you will record your rpm while you are in 4th gear going 60mph. and then plug the numbers in the formula below:
RPM x tire diameter
------------------- = Gear ratio
60 x 336
I am going to go get parts today. The plugs and wires. New hose clamps for my radiator hoses. Etc. I will make not of the mph and rpm as you said before and I will let you know so we can find out if I'm running the right gears. But I did use my gps and noticed that my speedo was off about 3-4mph when running high 60s-low 70s. But I'll keep you informed. And hopefully I won't mess anything up by jumping into the engine. My Haynes manual better treat me good. Haha
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Old 01-22-2011, 02:46 PM   #19
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you should be fine man, good luck!
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Old 01-22-2011, 06:09 PM   #20
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you should be fine man, good luck!
Thanks for the help man.
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Old 01-22-2011, 11:37 PM   #21
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Thanks for the help man.
Anytime man!

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