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Unread 07-24-2009, 08:17 PM   #1
vintageagain68
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1995 YJ Wrangler 
 
Join Date: Jun 2009
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Crank Position Sensor 89/95

So i'm in the middle of putting a 89 2.5 (w/MPI swap) in my 95 yj. The motor is shot so i bought another jeep with a poor body and am swaping the drive train. Through my research i have found the crank position sensor for the 1989 is different from the 1995. Any suggestions on how to handle this?

Can i just cut the connector and replace with the 89 connector? Can i just swap out the sensor and not worry about the flywheel?

for simplicity i'm trying to swap the n231 ax5 and 2.5 as an entire unit from one vehicle to the other.

thanks for the help

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Unread 07-24-2009, 08:42 PM   #2
93jeepyj
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The same year flywheel needs to be used with whatever year computer you are using. If you are keeping the 89 computer I think you need to put the 89 flywheel on the new motor.
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Unread 07-24-2009, 08:56 PM   #3
dodger889
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Will your 95 cps fit the 89 engine? I would think that way.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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Unread 07-24-2009, 10:30 PM   #4
DriveTooMuch
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Quote:
Originally Posted by vintageagain68 View Post
So i'm in the middle of putting a 89 2.5 (w/MPI swap) in my 95 yj. The motor is shot so i bought another jeep with a poor body and am swaping the drive train. Through my research i have found the crank position sensor for the 1989 is different from the 1995. Any suggestions on how to handle this?

Can i just cut the connector and replace with the 89 connector? Can i just swap out the sensor and not worry about the flywheel?

for simplicity i'm trying to swap the n231 ax5 and 2.5 as an entire unit from one vehicle to the other.

thanks for the help
The engine blocks are basically the same. I would switch over the entire fuel injection system from the 95, the whole intake throttle body, etc. the distrubutor, basically all the externals of the 95. The computer is not going to know the difference between the 2 blocks, they have not changed, it is the same displacement.. the block. So your computer will think it is the same engine. That is what I would do. The part number is probably different for the sensor, it is a different computer, ecu, etc. but the notches on the flywheel should be the same. Are you saying that then that the sensor is different because the notches on the flywheel is in a different location, or the mounting on the bell housing is in a different location? Retain your computer, and cps and switch over all the "externals on the shot engine. Thats what I think I would do from what you are saying.
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Unread 07-25-2009, 08:54 AM   #5
vintageagain68
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i'm not sure, i read on this post:

about a the different cps and flywheel. i then went to an autoparts website and saw the sensor and flywheel are different.

so i don't know about the compatibility of the sensor data and flywheel

i plan to port everything from the 95 over to the 89 but was hoping not to break apart the engine/tranny/tc
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Unread 07-25-2009, 11:33 AM   #6
DriveTooMuch
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just change everything over from the 95. The engine block is the same.
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Unread 10-26-2009, 06:52 PM   #7
vintageagain68
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swapped everything over and no issues, thanks!!
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Unread 02-26-2015, 07:04 PM   #8
zombiecrawler
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I'm putting a 2.5 from a 2001 into my 89 can I just swap my throttle body onto it and plug my cps into the block or something what do I have to do? Any help is very much appreciated
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Unread 02-26-2015, 08:59 PM   #9
Mark05059
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you do just like the post above says... change all the sensors/flywheel from the 89 onto the 2001 motor...
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Unread 02-27-2015, 07:17 AM   #10
Que89YJ
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Zombie isn't that a coil on plug engine?
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Unread 02-27-2015, 07:43 AM   #11
Jeepsr4me
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Quote:
Originally Posted by Que89YJ View Post
Zombie isn't that a coil on plug engine?
No the 2.5 was never that way..


Just use the long block and swap over all your intake and sensors and you will be fine..

i do this all time
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Unread 02-27-2015, 02:29 PM   #12
zombiecrawler
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hey great info ty guys just saved me about 700$ lol awesome
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Unread 02-27-2015, 02:50 PM   #13
zombiecrawler
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anyone know of a good fix for the front axle vaccum not engaging?
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Unread 02-27-2015, 03:11 PM   #14
mike134
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Quote:
Originally Posted by zombiecrawler View Post
anyone know of a good fix for the front axle vaccum not engaging?
You should go to one of the many many center axle disconnect threads which talk about repairing or replacing the CAD system. Its easy to repair, but some people just like to replace it with a maintenance free cable system or just use a solid axle and be done with it forever.
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