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Unread 07-01-2011, 04:27 PM   #1
tecman
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Emmisions Legal?

91 Wrangler with a sick card! Has original carb and runs very poorly sputters backfires etc....! Moved from Nebraska (no emissions tests) to Colorado I now need to replace the carb and need to know what a good replacement would be that will pass the emissions tests in Colorado!

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Unread 07-01-2011, 11:04 PM   #2
Xpress
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Sputtering and backfiring could be from dirty jets on the carb. If I were you, I'd unbolt it and get to scrubbing.
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Unread 07-01-2011, 11:07 PM   #3
monkeyhouse
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Quote:
Originally Posted by tecman View Post
91 Wrangler with a sick card! Has original carb and runs very poorly sputters backfires etc....! Moved from Nebraska (no emissions tests) to Colorado I now need to replace the carb and need to know what a good replacement would be that will pass the emissions tests in Colorado!
what's a 402? I didn't think they manufactured 4.2's in 90, so just not sure you actually have a carb?
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Unread 07-01-2011, 11:15 PM   #4
5-90
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Originally Posted by monkeyhouse View Post
what's a 402? I didn't think they manufactured 4.2's in 90, so just not sure you actually have a carb?
The AMC 6-258 was produced until the end of the 1990 model year, used in the YJ. It remained carburetted - but the 6-242 head and top end can be swapped on and the engine converted to fuel injection.

Only the YJ had the 6-258, 1987-1990. It overlapped those years with the 6-242 in the XJ and MJ.
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Unread 07-01-2011, 11:23 PM   #5
monkeyhouse
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Quote:
Originally Posted by 5-90 View Post
The AMC 6-258 was produced until the end of the 1990 model year, used in the YJ. It remained carburetted - but the 6-242 head and top end can be swapped on and the engine converted to fuel injection.

Only the YJ had the 6-258, 1987-1990. It overlapped those years with the 6-242 in the XJ and MJ.
thanks, awesome info as usual mr. 90! still not sure what he is referencing as a stock 402 though?
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Unread 07-01-2011, 11:39 PM   #6
1986cj
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He most likely means a 4.2 not a 402. YJs didn't get the 4.0 in tell 91, first year for a 4.0, HO, fuel injection and a obd1, They never put a 4.0 renix in a YJ.
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Unread 07-02-2011, 12:10 AM   #7
monkeyhouse
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Originally Posted by 1986cj View Post
He most likely means a 4.2 not a 402. YJs didn't get the 4.0 in tell 91, first year for a 4.0, HO, fuel injection and a obd1, They never put a 4.0 renix in a YJ.
I figured, just thought maybe somehow someone put it in after and he thought that was stock. Thanks again!
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Unread 07-02-2011, 07:36 AM   #8
jay-h
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If you're dealing with emissions your best bet is to stay strictly stock. The running problems may or may not be related to the carb, you can get a replacement for about 180.

Using this as a guide, make sure everything is hooked up and set correctly.

http://home.sprynet.com/~dale02/
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