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Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > 258 DOG

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Unread 12-01-2001, 08:36 PM   #1
jerk with a jeep
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Join Date: Dec 2001
Location: Bonney Lake Wa.
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258 DOG

I have an 89 YJ that is slow. It does have an automatic trans which doesn't help. Does any one know if a 4.0 head will fit the 258 block? I am going to install headers, juice box TFI ignition upgrade and after market carb and manifold. Which would be the best way to go,clifford intake and holley carb or weber and the stock manifold? I need to get more power out of this thing!

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Unread 12-01-2001, 10:42 PM   #2
FLHT_FXRS_YJ
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Join Date: Mar 2001
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What are your rpm's like? If you're having problems getting any high rpm's, then you could have a plugged catalytic converter. My 89' yj w/4.2 had absolutely no power and was really a dog. I couldn't even get 2800 rpm's when I first noticed I was having problems. By the time I figured out what was going on, all I could get was 1200 rpm's and I couldn't even climb a slight hill going down a paved road.
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89' YJ - 4.2 - NV4500 - NP231w/sye - 1" Body Lift - 2 1/2" Rancho Suspension Lift - 31" Firestone MTR - AR Outlaw II - Tomken Bumpers F & R - Warn 8000 front - Warn 6000 rec. mount rear - FlowFit Seats - Tom Woods Rear & Custom 2" front driveshafts
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Unread 12-01-2001, 11:48 PM   #3
jerk with a jeep
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Are you into harleys? Iam building a soft tail,a realy fat soft tail.
I had not thought about the cat converter, I'll check it. I,ve had other 4.0,s and 258,s and they ran realy well. It seems realy odd that this one doesn,t. Thank you for the info. Let know about the bikes.
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