94 to 96 1mz engine swap - Toyota Nation Forum : Toyota Car and Truck Forums

faoc · 03-01-2011, 12:25 AM

Bought engine from junk yard and was told it would fit right in . It did then we found out about some wiring changes, changed the igniter, everything else seemed to match up , Engine started right up but runs very rough. Installed new plugs, timing belt,air filter, oil seals, changed oil. Any how any ideas what else needs to be done. Any help will be greatly appreciated.

chronoti · 03-01-2011, 03:58 AM

well the 94 was a coil on plug system (6 coils) and the 96 was waist spark (3 coil plugs) which way did you go? should of gone with the 6 coil pack system to drive everything correctly

faoc · 03-01-2011, 07:54 AM

I am new to this .What exactily do you mean? To this point all I have changed is the igniter and it seems I had to do that to keep the 6 coil packs What else might I do to keep the 6 coil pack system?

chronoti · 03-01-2011, 11:47 AM

that should be it, why did you have the change the igniter?

faoc · 03-01-2011, 04:28 PM

The 94 had 2 plugs the 96 only had one.

Jason.MZW20 · 03-01-2011, 06:19 PM

You'd need the 96 ECU to control the wasted spark correctly as it required a change in the ECU to fire the paired cylinders twice. You're most likely only running on three cylinders.

You should have used the coil on plugs and entire engine harness from your 94 1MZ on the 96 1MZ.

Here's how the 94 ECU and ignition system works:

Igniter 1
Cylinder 1 - COP 1 fires (IGT1)
Cylinder 2 - COP 2 fires (IGT2)
Cylinder 3 - COP 3 fires (IGT3)

Igniter 2
Cylinder 4 - COP 4 fires (IGT4)
Cylinder 5 - COP 5 fires (IGT5)
Cylinder 6 - COP 6 fires (IGT6)

Matching IGT1-6 on the ECU side as well

The 96 system is less complex:

Cylinder 1 - COP 2 fires (IGT1), simultaneously firing cylinder 4 in the exhaust cycle
Cylinder 2 - COP 1 fires (IGT2), " " cylinder 5 " "
Cylinder 3 - COP 3 fires (IGT3), " " cylinder 6 " "

Cylinder 4 - COP 2 fires (IGT1), simultaneous firing cylinder 1 in the exhaust cycle
Cylinder 5 - COP 1 fires (IGT2), " " cylinder 2 " "
Cylinder 6 - COP 3 fires (IGT3), " " cylinder 3 " "

IGT1-3 only exists on the 96 ECU (same as the 1997-2001 Gen 4 Camry 1MZ)

chronoti · 03-01-2011, 06:50 PM

there your issue there wrong igitor switch back to the 94

faoc · 03-01-2011, 09:03 PM

Will try this tommorrow and let you know how it works out. Thanks

faoc · 03-10-2011, 01:13 PM

Quote:

Originally Posted by faoc

Will try this tommorrow and let you know how it works out. Thanks

Finaly got it running

after changing the wireing harness and switching harness back to the '96. Would have been a whole lot easier to change harness before motor was in car

but will know if there is a next time. only issue left is the fans run all the time. Any ideas where how to fix this problem??

Again thanks to all that responded and offered their help

chronoti · 03-10-2011, 01:49 PM

are you fans hydrological or electric

bronzemaxell · 03-10-2011, 03:00 PM

Quote:

Originally Posted by chronoti

are you fans hydrological or electric

94 v6 camry has hydro 1 big fan running all time by power steering/pump system, like as soon as the engine starts, it spin at very low speed.

other 1mz is 2 electric fans only, i think,

faoc · 03-10-2011, 03:45 PM

Fans are electrical !

chronoti · 03-10-2011, 07:56 PM

shouldn't have a problem but there is a separate fan controller is why i asked because it will control the system differently. only thing i can think of now is check the pressure switch on the ac, it hear the dryer

73sport · 03-10-2011, 10:47 PM

Fans are on because you swapped igniter and fired the engine. Because the ECU didn't get a signal back to it saying the plugs fired (parts mismatch), the ECU went into limp mode which triggers the fans, sets the engine temp to 175 and bunch of other fail safe stuff.

Reset the ECU and see if they turn off. Make sure AC switch is off too.

can you pull the code, assuming the check engine light is on yes?

73sport · 03-10-2011, 10:51 PM

Quote:

Originally Posted by Jason.MZW20

You'd need the 96 ECU to control the wasted spark correctly as it required a change in the ECU to fire the paired cylinders twice. You're most likely only running on three cylinders.

You should have used the coil on plugs and entire engine harness from your 94 1MZ on the 96 1MZ.

Here's how the 94 ECU and ignition system works:

Igniter 1
Cylinder 1 - COP 1 fires (IGT1)
Cylinder 2 - COP 2 fires (IGT2)
Cylinder 3 - COP 3 fires (IGT3)

Igniter 2
Cylinder 4 - COP 4 fires (IGT4)
Cylinder 5 - COP 5 fires (IGT5)
Cylinder 6 - COP 6 fires (IGT6)

Matching IGT1-6 on the ECU side as well

The 96 system is less complex:

Cylinder 1 - COP 2 fires (IGT1), simultaneously firing cylinder 4 in the exhaust cycle
Cylinder 2 - COP 1 fires (IGT2), " " cylinder 5 " "
Cylinder 3 - COP 3 fires (IGT3), " " cylinder 6 " "

Cylinder 4 - COP 2 fires (IGT1), simultaneous firing cylinder 1 in the exhaust cycle
Cylinder 5 - COP 1 fires (IGT2), " " cylinder 2 " "
Cylinder 6 - COP 3 fires (IGT3), " " cylinder 3 " "

IGT1-3 only exists on the 96 ECU (same as the 1997-2001 Gen 4 Camry 1MZ)

Still on your game I see! Good Job!