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Old 06-03-2013, 09:46 AM   #1
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87 wrangler with 4.2

What are some quick performance upgrades for my stock engine?

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Old 06-03-2013, 09:52 AM   #2
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I just put a cool air intake on mine. And I also have it converted to fuel injection. That's not a really quick upgrade tho. Its expensive and a lot of work.

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Old 06-03-2013, 09:56 AM   #3
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Are you running stock manifold and exhaust ?
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Old 06-03-2013, 10:02 AM   #4
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Yes. You can get headers and stuff like that but my opinion buying headers isn't really worth it. You can still buy exost tho.
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Old 06-03-2013, 10:10 AM   #5
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Yes. You can get headers and stuff like that but my opinion buying headers isn't really worth it. You can still buy exost tho.
I'd like for it to sound good...the carb floods itself so I guess I need to start there.
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Old 06-03-2013, 10:13 AM   #6
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Originally Posted by Ritchie View Post

I'd like for it to sound good...the carb floods itself so I guess I need to start there.
Rebuild the carb. New plugs and wire plugs and wires, maybe a distributer, play with the exost, new air filter, change the fluids. All things guys do to give there jeeps a real nice tune up.
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Old 06-03-2013, 10:22 AM   #7
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I just put a cool air intake on mine. And I also have it converted to fuel injection. That's not a really quick upgrade tho. Its expensive and a lot of work.
Almost as easy and cheap to just pull the 4.2 and put in a 4.0 out of a '91+.
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Old 06-03-2013, 10:26 AM   #8
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Almost as easy and cheap to just pull the 4.2 and put in a 4.0 out of a '91+.
X2 unless the 4.2 in your jeep has very little miles. I was lucky and bought my jeep with very little miles and it was already converted
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Old 06-03-2013, 11:16 AM   #9
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Team Rush - cap/rotor/wire/coil upgrade for the ignition.
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Old 06-03-2013, 11:21 AM   #10
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Eliminate the computer & ICM w/ an HEI distributor & add a MC2150 carb.

Night & day difference.
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Old 06-03-2013, 11:42 AM   #11
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I have a CRT preformance dizzy I'm willing to sell if you r intrested. It's 4 months old. Still new lol. Ill let it go for cheap.
Also a webber 32-36 carb that's a year old.
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Old 06-03-2013, 12:17 PM   #12
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I have a CRT preformance dizzy I'm willing to sell if you r intrested. It's 4 months old. Still new lol. Ill let it go for cheap.
Also a webber 32-36 carb that's a year old.
How much do you want for them? It has a webber on it now, it starts good in the morning but if it sits for 10 minutes it don't want to start with out flooding itself out It doesn't idle to good either
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Old 06-03-2013, 12:44 PM   #13
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Eliminate the computer & ICM w/ an HEI distributor & add a MC2150 carb.

Night & day difference.
I agree that's the best makes it simple runs better, don't forget it is only a 6 not a V8 You can spend all kinds of money but is it really needed It's a jeep! Another thing you can do is put 4.0L head on it they say that can add up to 40HP
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Old 06-03-2013, 01:16 PM   #14
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I agree that's the best makes it simple runs better, don't forget it is only a 6 not a V8 You can spend all kinds of money but is it really needed It's a jeep! Another thing you can do is put 4.0L head on it they say that can add up to 40HP
I said it once and I'll say it again.... I agree!!
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Old 06-03-2013, 01:19 PM   #15
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I agree that's the best makes it simple runs better, don't forget it is only a 6 not a V8 You can spend all kinds of money but is it really needed It's a jeep! Another thing you can do is put 4.0L head on it they say that can add up to 40HP
It's not fuel injected, so it shouldn't have a computer ..right? I don't want it to be a drag jeep or anything but I'd like to have plenty of power to clean the tires if I need to
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Old 06-03-2013, 01:22 PM   #16
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the nice thing about the 4.2 is its a easy motor to get extra power from. alot of the popular mods are already posted, another one is the exhaust, headers aren't needed for the 4.2, it doesn't rev high enough to benefit from them but a 2 1/2" high flo cat and a better muffler really helps, I went with magnaflow.
my favorite mod is a offenhauser manifold and a holley 390 cfm four barrel, great gas mileage when I take it easy and plenty of power when I open it up.
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Old 06-03-2013, 01:50 PM   #17
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It's not fuel injected, so it shouldn't have a computer ..right? I don't want it to be a drag jeep or anything but I'd like to have plenty of power to clean the tires if I need to
Your jeep has a computer that adjusts the timing w/ the stock distributor. It has a very slow advance curve which hurts power.

You can make the stock carb work w/ a rebuild, but many opt to replace them altogether.

The 4.2 make good low end torque. Open it up a bit, gear it for the tires you want & it will spin them w/ no problem.
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Old 06-03-2013, 04:09 PM   #18
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It's not fuel injected, so it shouldn't have a computer ..right? I don't want it to be a drag jeep or anything but I'd like to have plenty of power to clean the tires if I need to
The stock setup has a computer controlled feedback carb.

Check this page out for the basics of the stock setup: Adventures Under the Hood. I recommend reading the whole site to get familiar with the stock setup.

The best thing I did to my 4.2L was put in Howell TBI, as I could not put a different carb and keep it smog legal. Simplified the engine compartment and improved drivability. Howell kits aren't cheap though. Some people source the same TBI parts from a junkyard for much less.
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Old 06-04-2013, 05:57 PM   #19
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First thing you need to do is to get rid of the Carter BBD carburetor. See here: http://www.wranglerforum.com/f8/anot...ue-245479.html

Then do the Nutter Bypass and Team Rush upgrade.

For exhaust, that is simple as well, get a replacement Magnaflow cat, then a Thrush Welded muffler PN: 17651, and a replacement tail pipe from one of the auto parts stores.

Done!
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Old 06-08-2013, 03:59 PM   #20
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First thing you need to do is to get rid of the Carter BBD carburetor. See here: http://www.wranglerforum.com/f8/anot...ue-245479.html

Then do the Nutter Bypass and Team Rush upgrade.

For exhaust, that is simple as well, get a replacement Magnaflow cat, then a Thrush Welded muffler PN: 17651, and a replacement tail pipe from one of the auto parts stores.

Done!
What's the team rush upgrade?
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Old 06-08-2013, 04:20 PM   #21
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It is where they use FORD distributor cap, cap adaptor, rotor, plug wires, and an upgraded ignition coil on top of your stock dizzy.

However, it is more work, and about the same amount of money as converting to the HEI. AND, the HEI seems to be a better upgrade from my research.

It simplifies things a lot, and you can remove the stock ignition module, dizzy, and the wiring harness for the computer and those miles of vacuum lines and useless sensors along with the pulsed air system.

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