ONE39L

ok i got a 89 CFI ea sedan sittin in my garage and i was lookin around for some inspiration and TAA DAA! found how i can get over the cfi blues somebody changed their 3.9 cfi to multipoint injection but i cant get a hold of him can anyone help me out what would i need (besides the head and injectors and fuel rail) do i need the change the computer? (if it has one) if anyones done this or knows how to do it and feels like givin me the steps and a list on what ill need ill much appreciate it

 

Jase_ELXR8

Computer can stay. You need to change the engine loom though with one of a MPi.

carazy

how can the computer stay??? They are totally differant ECUS.

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Breathe! It's only the internet....

NZ

Any 3.9 Multi point ECU will work. Even though CFI and MPI are both bank fired they have totally different fueling. The engine loom from a CFI is fine. There is one wire that needs to be modified tho.

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Dot Aye You

ONE39L

NZ! finaly found ya buddy yeah what wire needs modifying? ill be gettin a workshop manual soon thatll help it along but i dunno how you did the conversion for 150 bucks haha! nice goin anyway thanks for all your help guys hopefully i can do this without blowin it up lol!

NZ

the workshop manual isnt much help as its not detailed enough.
but there is a post here explaining it.
do a search for mpi rewiring tutorial

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Dot Aye You

ONE39L

thanks heaps for that

ONE39L

well...i found it but after reveiwing the info and what the others got out of their mpfi conversions im better off leavin the donk as she is looks like too much labour and not enough fruit plus i was lucky enough to get a manual one to start with so its relitively quick as is sorry bout all that but thanks all the same

NZ

MPI was the best thing I ever did. I think the gains are maximised with a 5 speed going to mpi

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Dot Aye You

sylox

Ok mate here you go a almost complete parts list for the conversion. Using the best compatable parts from each model. YOu should be able to pick all the parts up for about $500 from you local wreckers. This is if your car is a manual by the way. The computer codes will be different if yours is an auto.

- EF dual plane intake manifold (Complete with air temp sensor/tps sensor/Injectors & rail etc etc
-EB Idle air control motor
-EA - ED mpfi fuel pump
-EF air cleaner assembly (the black piping that sits across the rocker cover)
-EF accelarator cable
-EA - EL dizzy mpfi
-EF thermostat housing
-EA mpfi wiring loom (ENGINE WIRES ONLY)
-EB-ED Manual mpfi ecu pre smart lock ( codes 7dac 7dad oda/ 7dac 7dad odb/ 7dac 7dad odc/ 7dac 7dad odd/ 7dac 7dad ode) Make sure the computer has one of the above codes on it.
- EL Vacum switch ( located under the water bottle.{Blue and black valve is the only one needed})

*Differences in wiring loom cfi to mpfi. The injector power wire is mounted to the fuel pump relay on the cfi and mounted to the efi relay on mpfi.
*Heater gose and dipstick both differ on the mpfi models but they can both be leant on gently to make clear.
*ChipTorque can make a switch to change the manifold from short to long runners and the appropriate rpm.
* You will need to make a bracket for the throtle cable.
* All wiring differences are shown in the wiring scamatics.

If on the off chance you can't find a manual computer(any of the codes i told you). I believe that companys like chiptorque can modify the auto ecu's to run as a manual anyway.

I hope that is of some assistance to you bud. Expect to gain about 110rwkw on a stock motor with the conversion. And that way your power wont be restricted to 11rwkw as it is with a cfi(very hard to get past that figure with cfi)

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