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Unread 06-10-2001, 01:07 PM   #1
iamthemellowman
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how do you like the 258 ci I6?

As I'm searching I realize i need a '91 or '92 at least to get the fuel inj. 4.0 which means close to 7k vs a 89 or 90 for 4k.

questions:
is the 258 a pig on gas?
would a newer 4 cyl be comparable to the older carbed 6?
could someone point me to a website with the original specifications of these motors?

Thanks

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Unread 06-10-2001, 02:49 PM   #2
Cody_91YJ
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Here ya go
Pre-1990:
4-cyl 2.5L (105 HP)
6-cyl 4.2L (115 HP)
Post-1990:
4-cyl 2.5L (123 HP / 139 ft-lb)
6-cyl 4.0L (180 HP / 220 ft-lb)
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Unread 06-10-2001, 03:44 PM   #3
iamthemellowman
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sweet, so a 1990+ should have the 4.0L motor (as long as it's I6), ok, that helps out a lot. Trying to set the criteria for choosing what jeep.

Thanks, and keep up the good work on your site!
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Unread 06-10-2001, 04:38 PM   #4
Cody_91YJ
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Let me clarify a bit...
1991 + is a 4.0
1990 is still a 4.2

u probably figured that out but just wanted to be sure, and thx about the site
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Unread 06-12-2001, 03:19 AM   #5
horatio102
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Don't forget that the 4.2L made 210 lb-ft at really low RPM, meaning it is great for crawling power.
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Unread 06-12-2001, 08:57 PM   #6
Cody_91YJ
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but with the 91' + you get 220, along with the added benefits of HP, so.....lol
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Unread 06-12-2001, 10:32 PM   #7
mikeyjph
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I've driven a 258 I6 with 130,000 miles on it every day for the last 2 years, so it's strong if nothing else. The main problem is the carbuerator, it WILL cause you problems, if nothing more than making it hard to pass emissions. It does have a lot of low end torque, but the carb sometimes has problems with steep inclines and high altitudes. And it chugs gas. I look forward to the summertime, because I get a whopping 15 miles to the gallon instead of the wintertime 11 or 12 (oxygenated gas) I love my Jeep, but I would hold out for the 4.0 if you can.
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Unread 06-12-2001, 11:38 PM   #8
iamthemellowman
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thanks, I ended up getting a bit more money from the insurance, so it looks like 4.0 here i come.
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Unread 06-13-2001, 10:22 AM   #9
dartboy
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I agree with Mike..hold out for 4.0 if you can. My Jeep has a 258 with 210,000 kms and it works fine except for the carb. I get a little better gas milage than mike...about 18-20mpg. I'm forever adjusting the idle...it is very tempermental. A friend of mine down the road has a 91 with the 4.0 and it works twice as good as mine. Seems to have just as much torque. Knowing what I know now about Jeeps (which isn't much ) I would have tried to get the 4.0
Good Luck

Jason Duffy
90 YJ
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Unread 06-17-2001, 09:36 PM   #10
lostboy
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the 258 produces it's torque at a much lower rpm than the 4.0 that's it's big benefit...because of the longer stroke....adding an mpi or any fuel injection to the 258 will incease reliability and mileage.
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Unread 06-18-2001, 10:30 AM   #11
dartboy
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I think it all depends on what you are going to do with your Jeep. If it is going to see a lot of pavement as your daily driver, you will like the 4.0 better. It's going to work better for you.
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Unread 06-21-2001, 04:07 AM   #12
solid
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The only thing I will say is avoid the BBD carburator...
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Unread 06-21-2001, 11:12 PM   #13
wilhelm
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mellow , go to 4x4 auction store .com or jeepbay . com and hit auction . there is a 90, 4.0 HO rebuilt w/16k stage 3 mopar prfmce kit . w/92 intake mfld w/ injtrs and 92 distr. w/ wire harnse. the max price posted is $550. , there is only one bid as of 6/21 , of $100.
good luck
wilhelm nj
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