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Old 01-13-2011, 03:45 PM   #1
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Exclamation 1993 engine in a 1990???

Being a (relatively) new owner of a Jeep Wrangler (1990 Laredo, 6 cyl 4.2 carburated engine, automatic transmission) I have a question (which may very well have lots of different answers in many aspects)

I have an opportunity to get a 4.0 6 cyl fuel injected complete engine which came from a wrecked 1993 Wrangler. I am being told that, other than the newer engine being fuel injected, the swap should be straight-forward. Has anyone on the forum done anything similar, or knows of any major problems I might end up getting into? Thanks in advance for the information and feedback!!!

Arturo M Garcia
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Federal / California
Los Angeles CA
(1990 Jeep Wrangler)

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Old 01-13-2011, 03:55 PM   #2
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The swap would be pretty simple... the only difference being the fuel injection, and you'll need the electronics to go with it, meaning the O2 sensors, the fuel pump and lines, fuel rail and injectors. It's going to be a bit more work than just dropping it in. If you have the time and space, go for it.

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Old 01-13-2011, 04:03 PM   #3
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Make sure and get the PCM from the 1993 if you can. May need as many electronics from it as you can get. If you can go completely 93' on the engines electrical components it will save a lot of headache.

Or, replace the top end with a carbureted 4.0 setup.
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Old 01-13-2011, 04:41 PM   #4
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Re: 1993 Engine on a 1990 YJ

I am being told that the '93 engine is complete with computer, sensors, and so on and so forth.... if anything, the guy who is selling me the engine said that the check engine light on the '93 would appear as the shifter light on the 1990 dashboard because circuit differences but nothing major (I have an automatic)... Any other components that I should get from the store during the process (recommended new during a swap???)

Thanks again for the advice and support!!!!

Arturo Manuel Garcia
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Old 01-13-2011, 04:48 PM   #5
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New would be (off the top of my head):

hoses
clamps
mounts or bushings for the mounts
oil
oil filter
spark plugs
air filter
serpentine belt
antifreeze
thermostat

I know theres more that you want to replace while in there... just can't think of it all. Do you have to replace all that? No, but its the best time to do it while the engine is being swapped.
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Old 01-13-2011, 04:55 PM   #6
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Re: Engine Swap ('93 on a '90)

Quote:
Originally Posted by sevenservices View Post
New would be (off the top of my head):

hoses
clamps
mounts or bushings for the mounts
oil
oil filter
spark plugs
air filter
serpentine belt
antifreeze
thermostat

I know theres more that you want to replace while in there... just can't think of it all. Do you have to replace all that? No, but its the best time to do it while the engine is being swapped.
In your guys opinion... Is the '93 a more powerful engiine / better gas mileage / better torque.... etc.... what are the main advantages to this swap? My own reasoning (the pro's) - supposedly better performance uphill and improved gas mileage.... anything else? any cons to this?

Thanks again!!!!

Arturo Manuel Garcia
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Old 01-13-2011, 10:09 PM   #7
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the 4.2 is better at torque
Also if the carb on the 4.2 is tuned right it gets about the same mpg .
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Old 01-13-2011, 10:46 PM   #8
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You'll have to drill a hole in the trans for the CPS Sensor {crank position sensor} or buy a CPS relocator.Another option would be to use his transmission.

If you are getting the wiring try to get the gauges and interior harness.It will make it easier
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Old 01-14-2011, 01:12 AM   #9
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Oh god..run from that Cater Carb... RUN!

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