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Old 06-22-2012, 03:56 PM   #1
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87 jeep wrangler

I am new to this site so excuse me if I sound silly, but I have an 87 wrangler that I would like to add a motor to that has fuel injection in it. I have the 4.2 6 cyl in it now. Can someone recommend a motor that will fit?

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Old 06-22-2012, 04:54 PM   #2
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i swapped in a 4.0 out of a 96 grand cherokee and kept i carbed. you have to adapt the intake and make brackets for the ps and alternator. but you could take the whole harness and everything you would have to have the flywheel for the crankshaft sensor so find one with an ax15 behind it so you can use the whole thing. also gonna need a fuel pump for fuel injection. alot of fab but the 4.0 smokes the 4.2 all day long

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Old 06-23-2012, 05:48 AM   #3
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Sweet I will look into that. I appreciate it.
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Old 06-23-2012, 06:47 AM   #4
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Could also bolt the 4.0 head to the 4.2 and swap over all the injection stuff
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Old 06-23-2012, 08:51 AM   #5
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You could also go the inexpensive route and get yourself a Howell or MOPAR fuel injection kit, since they do infact make the kits for the 4.2L engine......... It's a lot less hassle than having to swap in another engine.

You definitely want to go fuel injection, it's just infinitely more reliable. No stalling out once you get to steep angles either.
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Old 06-23-2012, 08:57 AM   #6
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1200 for a tbi setup???? Keep smoking. He can swap over all the goodies onto his 4.2 block for less than half of that.
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Old 06-23-2012, 03:04 PM   #7
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yea the mopar setup is expensive but i swapped in my 4.0 and adapted my intake and kept my motorcraft carb on it. run an msd box on my stock distributor. works like a champ. 2 keep fuel injection you have to change trans cause crank sensor is in trans and the ba5 stock in the 4.2 has no hole 4 it. thats why you will need ax15 also. but like i said you can adapt the intake onto the 4.0 block. dont get much simpler than a carb and msd ignition. if you want pics ill get em 4 ya.
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Old 06-23-2012, 03:05 PM   #8
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and i had 600 in a used engine with 80k on it
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Old 06-23-2012, 07:51 PM   #9
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1200 for a tbi setup???? Keep smoking. He can swap over all the goodies onto his 4.2 block for less than half of that.
$1200 is a drop in the bucket. Keep in mind these are Jeeps, you probably spend that much alone on gas for a month, especially with a stock 4.2 setup. And it's a lot less of a hassle to install a Howell kit over swapping an entire wiring harness in, getting the swap legalized, etc. especially since the Howell kit is completely isolated from the rest of the vehicles components- has its own wiring harness, sensors, and computer.
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Old 06-23-2012, 07:54 PM   #10
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Where are you shopping that you spend 1200 a month in gas?
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Old 06-23-2012, 08:00 PM   #11
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Where are you shopping that you spend 1200 a month in gas?
Considering most 4.2L owners with the stock setup report no better than 12mpg, that begins to add up VERY quickly, even if you're filling up at the cheapest gas station around town ($3.65 87 octane).

This is beside the point though. Gaining power, reliability, fuel economy and a whole host of other things alone is nearly worth the $1200 investment. Everyone that has done the swap has nothing but good to say about it.
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Old 06-23-2012, 08:05 PM   #12
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Man that's 328 gallons at your price or 22 tanks of gas. That means at 12mpg your driving over 5k miles a month.
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Old 06-24-2012, 01:01 AM   #13
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Man that's 328 gallons at your price or 22 tanks of gas. That means at 12mpg your driving over 5k miles a month.
You're still arguing a moot point, the point of going to FI is as I've listed above. It's just a better system.
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Old 06-24-2012, 04:36 AM   #14
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I am in a 87 with all of the same.. My plan is to put on the 4.0 head on my 4.2 from what i hear you get lots more ponies than the 4.0 and for the time being just rock my Webber when i get time to hook it up till i can afford the injection set up. Your carb will do a lot better when you do a Nutter bypass and give her a nice tune up. Gas can be around 18 to 22 with a proper running carb.
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Old 06-24-2012, 05:41 AM   #15
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You're still arguing a moot point, the point of going to FI is as I've listed above. It's just a better system.
My point is tbi is just as antiquated as a Carb. Hell its an electronic Carb. Ive had several and they are crap. If you are going EFI go the extra mile and use an mpfi setup. That 1200 will buy a complete swap and more than a few tanks of gas. Then you get more power than the tbi set up, better mileage, you won't have issues at incline. Do it once and do it right. A harness is no biggie ina wrangler. Wanna talk tight? Do it in a vette. Need hands like a 5 year old.
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Old 06-24-2012, 09:24 AM   #16
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Except TBI is just as reliable as MPFI. Ask anyone who's done the swap, you're just assuming that because vehicle manufacturers don't include TBI setups with their vehicles anymore means that it's crap.

TBI does not have incline issues because it is still fuel injected. It is not a carburetor, there are no jets, there are no floats, no fancy valves or accelerator pumps, it's a big fuel injector stuck inside of a throttle body.

The only way you're going to get more power from an MPFI setup is if you swap in ALL of the 4.0 intake, head, and exhaust components, otherwise you're wasting your time. Oh and by the way, the 4.2L makes as much torque as the 4.0 HO models, with the stock crappy carb. Fuel Injection just increases that torque output. Horsepower means nothing without torque.
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Old 06-24-2012, 09:54 AM   #17
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I assume nothing. My experience with tbi has always been disappointing and I've had a few. Out of curiosity how many people do you know that have dropped the coin for this swap?
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Old 06-24-2012, 10:33 AM   #18
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I'd keep the carb takes2 times of taken it apart and rebuilding it and then u could Damn near do it anywhere even on the trail if need be ... I think its easier but what do I know
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Old 06-24-2012, 11:21 PM   #19
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I assume nothing. My experience with tbi has always been disappointing and I've had a few. Out of curiosity how many people do you know that have dropped the coin for this swap?
How many do I know personally? None, but I am more than capable of doing my own research to come to a decisive conclusion. Like I said, those who report of doing the Howell swap have nothing but good things to say about the swap. You should be more than capable of using that fantastic search engine called Google to come to your own conclusions
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Old 01-23-2013, 05:20 PM   #20
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i will have to agree with XPRESS, the money will be recooped in a short time with the Howell system, i spoke with Troy @ Howell yesterday, and the gas milage will improve along with torqe and HP. then there s the reliability of all GM parts that are readally avail. if needed, any one can do a search and find large amounts of info on this swap.. Howell has been doing this swap scence 1995, just that alone should speak for itself, also the system runs in a closed loop, completly self contained to keep it simple

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