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Engine replacement


 
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rodneyjt24
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Joined: 19 Jul 2005

PostPosted: Mon Aug 15, 2005 4:22 pm    Post subject: Engine replacement Reply with quote

I am kind of new here and have some questions. I have an 88 XJ. I need to replace the engine 4.0 straight 6. The engine I have to replace it with is from a 94. There is no pace for the knock sensor on the 94 and the distributor shaft is clocked a few degrees different from the 88. Does this make a difference? Also I was told that the drive plate would need to be changed. Can anyone help?
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ThePhantum
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Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Mon Aug 15, 2005 7:42 pm    Post subject: Reply with quote

I know that there's no knock sensor on the 94...but I'm not sure if that will cause a problem with the ECU. Otherwise it should be fine. When you say "drive plate" I assume you mean the flywheel? Is the 88 an auto or a manual? Same question for the 94.
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rodneyjt24
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Joined: 19 Jul 2005

PostPosted: Tue Aug 16, 2005 2:00 am    Post subject: Reply with quote

They are both automatic. I noticed that the distributor shafts are clocked about 4 degrees different from eachother. That is, the distributor from the 88 will not seat at the exact same place as the one from the 94. Also, the flywheel has a different amount of notches on it than that of the 88. I am told that the crank position sensor counts these notches for timing purposes. Well we have the 94 engine it the vehicle now and I am not getting any spark. I traded the distributor shafts and it does line up with TDC. But I am wondering if the flywheel thing could be an issue because of the different amount of notches, it may not be sending te correct info to the ECU.
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rodneyjt24
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Joined: 19 Jul 2005

PostPosted: Tue Aug 16, 2005 5:49 am    Post subject: Reply with quote

Ok guys and gals. I did some research and made a few phone calls, here is what I found. Since I am not changing the wiring harness to accomodate the 94 engine, the flywheel from the 88 needs to go on the 94 block. The CPS is a different model between these years and the ECU in the 88 needs the info from the 88 flywheel and CPS. This is why I have no spark. The CPS on the 88 is not sending the correct info to the ECU because the flywheel is notched differently. Thought I would pass this on to every one in case you have the same problem. Very Happy Now I have to take this engine back out, not fun. Crying or Very sad If I learn anything more I will post it for everyones benefit.
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