4.0 or 4.2??? - Page 4 - JeepForum.com
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post #46 of 58 Old 12-16-2013, 03:35 PM
mustanggarage
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1990 YJ Wrangler 
 
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several things. first of all I had a similar situation with my jeep. bought a 90 yj that had the 4.2 and an aftermarket carb. I used this page to help sort out all of the messed up vacuum lines etc. on the weber. it helped a lot. http://www.jeepforum.com/forum/f12/w...ite-up-382309/

once you get all the vacuum lines sorted out like it shows make sure you have a fuel filter with a return line like it is supposed to have or else you may need a fuel pressure regulator to get the fuel pressure down to the 3-4 psi the weber likes.

after that make sure the p.o. did the nutter bypass. if he removed all the emission stuff and did not do the bypass the computer can mess up the timing. here is the page I used to do that. http://www.jeepforum.com/forum/f12/p...bypass-476720/

after that just make sure you have good plugs and wires, good grounds and set the timing by turning the distributor to about 8 degrees BTDC.

and it should run like a top.

I ended up doing a fuel injection conversion later on just to make it easier for my daughter to start and drive it, but it ran great with just those steps.


My yj: http://www.jeepforum.com/forum/f22/joopacabra-1563169/
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post #47 of 58 Old 12-17-2013, 08:33 AM Thread Starter
Kingston
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i did use what extra line i had left to cap the end of this
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motor1.JPG  

1987 YJ Wrangler 4.2ltr 5 speed 4" rough country lift with 31x10.50 tires

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post #48 of 58 Old 12-17-2013, 10:35 AM
YJ4LIFE
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howell TBI vacuum diagram and follow that. and your egr nipple looks busted

'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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post #49 of 58 Old 12-17-2013, 11:06 AM Thread Starter
Kingston
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I deleted all the emissions thank you tho

1987 YJ Wrangler 4.2ltr 5 speed 4" rough country lift with 31x10.50 tires

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post #50 of 58 Old 12-17-2013, 11:39 AM
YJ4LIFE
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Quote:
Originally Posted by Kingston View Post
I deleted all the emissions thank you tho
ah ok. I did all the nutter stuff but I still wanted to pass tailpipe test and supply vacuum to the 4x4.

'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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post #51 of 58 Old 12-17-2013, 12:00 PM Thread Starter
Kingston
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we got severe Test to under go around here....they check EEEEEVVVVEEEERRRRYYYYTHING.....so im getting historic tags on my jeep so i dont have to worry about taking anymore tests......back home is MS and LA..there is no test lol u pay 5$ got a sticker and left lol

1987 YJ Wrangler 4.2ltr 5 speed 4" rough country lift with 31x10.50 tires

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post #52 of 58 Old 12-17-2013, 12:04 PM
YJ4LIFE
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Quote:
Originally Posted by Kingston View Post
we got severe Test to under go around here....they check EEEEEVVVVEEEERRRRYYYYTHING.....so im getting historic tags on my jeep so i dont have to worry about taking anymore tests......back home is MS and LA..there is no test lol u pay 5$ got a sticker and left lol
ah. our tests are pretty strict but you can't cheat the tailpipe. if you get a big name shop they'll fail you for k&n n bull**** but most mom and pop want you to pass to keep you happy and coming back.

'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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post #53 of 58 Old 12-17-2013, 12:27 PM Thread Starter
Kingston
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I just moved to MD on black friday so im learning how great the south was with that kinda stuff lol everyone ran around, me included, with straights even some with no cats...and noone cared but up here u gotta give ur first born even to buy guns lol

1987 YJ Wrangler 4.2ltr 5 speed 4" rough country lift with 31x10.50 tires

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post #54 of 58 Old 12-17-2013, 01:30 PM
bgredjeep
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I don't know the rules for vehicle inspections in MD, but if they are anything like most of the other northeastern states, you'll honestly be better off selling that Jeep to someone further south and finding another that hasn't been messed with. Many states will fail that Jeep 5 seconds after they open the hood to find all the OE equipment removed, aftermarket carb, etc.
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post #55 of 58 Old 12-17-2013, 01:34 PM Thread Starter
Kingston
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im getting the Antique tags put on....i wont have to do any kind of inspections...lucky lucky

1987 YJ Wrangler 4.2ltr 5 speed 4" rough country lift with 31x10.50 tires

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post #56 of 58 Old 12-17-2013, 01:51 PM
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I have an 88 that came to me with the nutter done and all of the emissions components were still in place. I pulled up the vacuum diagram from a 258 cj and replicated everything. For a while i was running the filter night off the valve cover like the OP showed. I also had the pcv hooked up to the correct location. Still had oil coming onto the valve cover. The solution i found was to run a 90 degree copper elbow to a heater hose and run it all the way back on the frame rail to just in front of the back tires and put that filter on the end. Just have to be dilligent abut checking that filter and keep it clean. Another thing to name sure of is that the gromets in he valve cover are correct. I was told by my dad that the old school car guys just used to run that hose un filtered. Also the source of that oil culd be a symptim of blow by.
Im no professional by any means but i just thought i would throw my 2 cents. God luck!
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post #57 of 58 Old 12-17-2013, 02:46 PM Thread Starter
Kingston
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thanks, theres a place right down the roads....i think imma get them to tune it and solve the issue...im bought ready to move on past this stage of it.....ive thought about just putting a 383 in there and say skrew it lol

1987 YJ Wrangler 4.2ltr 5 speed 4" rough country lift with 31x10.50 tires

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post #58 of 58 Old 12-17-2013, 03:10 PM
YJ4LIFE
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Quote:
Originally Posted by Kingston View Post
thanks, theres a place right down the roads....i think imma get them to tune it and solve the issue...im bought ready to move on past this stage of it.....ive thought about just putting a 383 in there and say skrew it lol
have them do a compression test. if the bottom is still good you can do 4.0L head and efi. I only kept the 4.2l head because it was rebuilt not that long ago

'89 YJ, 4.2L, ax-15, B&M shifter, 1" BL, TJ flares, '99 intake, '91 EFI, 5.0L explorer injectors, GenRight tank & stretch, 35" ProComp Xtreme muds, 52" chevy springs rear, 44044 Ranchos front.....
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