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post #1 of (permalink) Old 02-12-2002, 07:43 PM Thread Starter
Pog
 
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TJ 4.0 in a 4.2 YJ

What would be needed to do this? Obviously all the electrical, fuel supply, computer. Is there any way to keep my original dash or would the be too much splicing involved in this? thx mines an 88 Laredo

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post #2 of (permalink) Old 02-12-2002, 11:03 PM
 
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Re: TJ 4.0 in a 4.2 YJ

Many poeple spend the money and stick the 4.0 head and EFI on the 4.2. The 4.2 has a longer stroke, and I beleive it is capable of producing a better torque curve with the EFI and 4.0 head.

If you do a search, you will find many topics on this.


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post #3 of (permalink) Old 02-13-2002, 05:18 PM Thread Starter
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Re: TJ 4.0 in a 4.2 YJ

Ok I have done the search and learned a lot but I still have no idea about the computer wiring for the 4.0 I am gonna get one from a wrecked 2000 tj but it has the sentry theft thing and guess what no keys..... Dealer said that it won't start without the damn key. what can I do?

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post #4 of (permalink) Old 02-13-2002, 06:29 PM
 
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Re: TJ 4.0 in a 4.2 YJ

remove the Sentry theft Device.. No, I dont know, I havent ever had to steal a jeep yet... But Needshelps TJ is tempting me more and more..


...One New Car, A Few New Parts, A Lot More Scars...
94 ZJ
89 FSJ - 6-inch Rustys kit, XTerrains 33"S
87 YJ - 5" of lift, 33BFG"s. ARB snorkel. Borla Header.
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post #5 of (permalink) Old 02-14-2002, 04:09 PM Thread Starter
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Re: TJ 4.0 in a 4.2 YJ

Lol that would be just like buying your jeep and not building it there is no fun in that.

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post #6 of (permalink) Old 02-14-2002, 05:30 PM
 
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Re: TJ 4.0 in a 4.2 YJ

Get a key made. Our TJ was totaled out and when we were thinking about purchasing it the dealer had no idea how many miles on it becasue of the digital stuff. It turned out pretty good and the key works great.

Sorry, my YJ is a 90, not an 87.

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post #7 of (permalink) Old 02-15-2002, 01:27 PM
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Re: TJ 4.0 in a 4.2 YJ

I've been doing a lot of searching and thinking about this myself. I'm going to put the 4.0 head on my '80 w/ the fuel injection from a 2001. The encripted key thing is a big obstical to overcome and if you can find a computer/wireing harness from a Jeep without it you are better off (it is an option on TJ's). Also, a 2001 computer will need feedback from the dash - so you will have to put a TJ dash in. I am not sure what year Jeep started the dash relays. I think that I am going to use a computer form a '95-97. I have the option to get a comp/harness from a '98 TJ but I still haven't been able to tell if it runs off the dash.

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