engine swap need answer quick please

[BadaBoom]

Will a Explorer 4.0 from 1999 fit in a 1993 explorer? Will i need to change computers and accesories? I have a chance to buy a 4.0 for cheap but i need an answer soon. Any help would be great. Thanks!!

 

[Jason_25]

Yes, but you will need the flywheel from the 99 model. Also, you will need to keep your existing computer and wiring, and just swap your intake and exhuast onto the 99.

Make sure the 4.0 is an OHV and not an SOHC.

 

[expo5.0]

if it is the sohc you will need to change harnesses.

 

[Doug904]

If its a SOHC you'll need to change alot more then just the harnesses.

 

[davesexplorer]

well i dont know that much about engines, but i do know that the 99 is an OBD 2, and your 93 is an OBD 1, so i dont understand how this will work with his 93 computer.

 

[Maniak]

If they are both the OHV motor then the orig computer will connect to the newer motor.. BUT.. the newer has the lean burn heads..

There is a web page (I don't have it handy) that talks about rebuilding the 4.0L motor (OHV).. and what the different years had different etc...

They say that the old computer and new heads don't mix... I don't remember why.. If I find the site. I"ll post the url..

~Mark

 

[BadaBoom]

Well to update everyone. I bought the 99 OHV for a whopping $250.00 I had to get it for that price. I talked to Engines Only here in Chico. The guy didnt metion the new computer being needed. If you have that website i would like to see it. That way i can get the ECU before i tackle the install.

 

[Maniak]

I found the URL I was thinking of...


It is Dead Link Removed

Ford introduced another new head in ’98. The exhaust ports on the 98TM-AD were much narrower than they were on the earlier castings; they measured 1.40½ across the port compared to 1.70½ on the 95TM/97TM castings. According to the engineers I have talked to, the smaller ports increased the velocity of the exhaust gasses so they carried more heat down to the catalytic converter. This helped the converter “light off" sooner, so it did a better job of reducing emissions during the critical start-up and driveaway phase of the EPA emissions test. With that in mind, it’s probably not a good idea to swap these heads back and forth with any of the earlier castings.

All of these engines had the same compression ratio whether they came with the original heads with the open chambers or the newer ones with the heart-shaped chambers, so they would seem to be interchangeable, but the computer calibration that was used for the old-style heads with the open chambers will not work with the newer heads with the fast-burn chambers. In fact, "It will burn the engine down in a few thousand miles," according to a Ford engineer who worked on this engine program

BUT.. I think this is more for doing stock rebuilds... and I doubt that many of us on the site have completly stock vehicles... We have made modification that work fine that most "normal" car places would say to never do... But some of the info does make sense.. BUT it appears to me that they are talking about using the new heads on an old block.. which you aren't trying to do...


~Mark