Outer Limits 4x4 Board

Ive got a rangie with the 3.9l motor and it doesnt have a air flow meter in the intake hose, but its all plumed up and looks like it has been like this for a long time. It does have a home made sensor the goes into a bolt thats welded to the side of the metal pipe that is joined to the intake side of the air cleaner. my question is does it need a air flow sensor to make the motor go ?

Cheers Steve.

ifslux wrote:Ive got a rangie with the 3.9l motor and it doesnt have a air flow meter in the intake hose, but its all plumed up and looks like it has been like this for a long time. It does have a home made sensor the goes into a bolt thats welded to the side of the metal pipe that is joined to the intake side of the air cleaner. my question is does it need a air flow sensor to make the motor go ?

Cheers Steve.

Sounds like it has an aftermarket ECU and that sensor in the intake is a MAP sensor, in which case it doest need a AFM.

Loanrangie wrote:

ifslux wrote:Ive got a rangie with the 3.9l motor and it doesnt have a air flow meter in the intake hose, but its all plumed up and looks like it has been like this for a long time. It does have a home made sensor the goes into a bolt thats welded to the side of the metal pipe that is joined to the intake side of the air cleaner. my question is does it need a air flow sensor to make the motor go ?

Cheers Steve.

Sounds like it has an aftermarket ECU and that sensor in the intake is a MAP sensor, in which case it doest need a AFM.

yep, that or its just an air intake temp sensor, but as Nick said its got an aftermarket ECU.

A MAP sensor will be after the throttle body by definition. Usually there will just be a hose to a box on the firewall or near/in the ECU .
The one near the air cleaner is an air temp sensor.

Regards Philip A

Cheers for the info. The big problem ive got is that its missing the ecu and most of the wiring harness, so ive got to start again. Its also got coil packs insted of using the dizzy. Can i use a standard rangie harness and ecu and use the coil packs or do i have to go back to the dizzy ?
Trying to work out what to do, go standard or go aftermarket ecu.

Cheers Steve

Ive been informed today while chasing parts that my motor is a 4.6l not a 3.9l, now im realy lost. they all look the same.

Well that's an interesting one. Looks like a Megasquirt transfer.

It will probably be cheapest to reinstate the 14CUX , but you will have to buy a loom, MAF, and ECU. Is it a 89 on model which originally had a 3.9 or some older model which a 3.9 has been added to? I assume the TPS and temp sensors and injectors are still there.

In any case you will have to work out how to give the 14CUX a rev signal as it gets it from the coil usually. You don't necessarily have to go back to dizzy but somehow get a pulse for each cylinder.

If it is pre1989, the 14CUX will not have a VSS signal and may stall as you come to a stop, as AFAIR has been posted here or on AULRO.

If money is no object you could get a 14CUX loom and add a Syntek plug and play ECU but it only works with a dizzy albeit a pinned one for the mapped model.

If you are a nerd you could build and install a Megasquirt,which will work with EDIS.

Or you could get somone to install a turn key ECU such as Graeme Cooper and a Haltech, but this would get expensive. Maybe $2500.
Regards Philip A

Its a 85 model car wich i thought had a 3.9l in it, but after talking to british of road and giving them the engine number they tell me its actually a 4.6. they all look the same to me.

Ive been informed today while chasing parts that my motor is a 4.6l not a 3.9l, now im realy lost. they all look the same

.

Well does it have a distributor or hole for one? A 4.6 block can either be as fitted to a disco 2 /RR38 or can be retro fitted to all the bits from a 3.9.

Is it a Thor? ie have long curly inlet manifold or does it have a "box" on top?

If it is just as fitted to a Disco 2 ( AND I know they didn't have a 4.6 only a 4.0 for all the trainspotters), then you have zee problem.

AFAIK the ECU of a 38A /D2 also has BECM functions and needs the correct responses form body sensors eg doors to start. In addition the ECUs are coded to the VIN of the cars. Probably can be done but I believe you have to buy a new one with all the BECM functions disabled.
Do some study and give us some answers to work on.
Has it ever run in the car?
Regard sPhilip A

It has a distributor fitted and has the box type manifold. everything looks the same as a 3.9. From what ive been told it was running in the car.

OK you can get it to run on a 14CUX but you will not have a VSS as an 85 has a mechanical speedo, which means you will not have overrun injector cutoff or step up idle while moving.
I do not know about whether the 85 has the ECU controlled evaporation canister but I think not, but this is not a big deal.

I guess the next question is does it have a 3.9 inlet manifold and fuel rail or one from a 3.5 as this will determine whether you can fit a 14CUX.

So have a look and see whether it has an injector sticking out mid way along the RH side of the "box" or is there a IAC valve at the RH rear of the manifold? Also do the injectors have little pipes on top of them or does each injector plug into the fuel rail?

Regards Philip A

The injectors plug into the fuel rail and it has a plug with wires coming out of it on the rh rear of the manifold.

OK , well you can fit a 14CUX as it is a 3.9 manifold .

Now you have to source the stuff needed.
It sounds like you will need a full loom , ECU and MAF.
The ECU temp sensor should be on the top of the manifold behind the thermo housing, and there should be a fuel temp sensor on the rail. They are only about $30 each anyway.

Whether the rail is from a Disco or RRC will determine where the fuel temp sensor is, but on an RRC about 1/2 way along the LH side of the rail.

I assume there is a TPS on the throttle body with the correct plug?

You will also need an amplifier for the dizzy , if there is not one there and a coil.

There is a plug and play modern ECU available to replace a 14CUX made by Syntek if you find you cannot get a 14CUX cheap enough. Have a look at their site.
Regards Philip A

Cheers for all your help mate, very much appreciated.

Theres no fuel temp sensor so i will have to get one of them.

The tps is there with plug.

I will need to get a complete dizzy as the one ive got has no internals and also no amplifier.

Also is 14cux the model of computer ? as im not real clued up on all this.

Cheers Steve.

Yes.

Regards Philip A

Withe the loom do i need to find one to suite a 3.9 or one that comes with the ecu, or are they all the same. I was reading that there is different types of 14cux ecu's is that right ? does it matter wich one i get ?

Cheers Steve.

The early Disco 3.5s had a 14CUX, but aside from them all RRC and Disco 1 14CUX are 3.9.

The 3.5 loom AFAIK will be OK with a 3.9 ECU. As in all things you would be best to get a full set of ECU , loom, sensors from the same car. Give gary at CLR a call as I know he wrecks RRCs.

The 3.9 ECUs changed part numbers and may have had some minor tuning differences but all should work with any 14CUX loom. if you have a 3.9 I would avoid a 3.5 ECU as the tuning may be different, But I do not know for sure.
The 40 PIN plug into the ECU always had the same pin position AFAIK , although I think the later looms ( say 96 on D1) had different colour coding for the loom wires. But this is easy to check by getting the 40Pin wire positions and tagging the wires .
Regards Philip A

With the dizzy do i get one from a 3.9 or a 4.6 or are they the same thing ?

Cheers Steve.

ifslux wrote:With the dizzy do i get one from a 3.9 or a 4.6 or are they the same thing ?

Cheers Steve.

4.6 dont have dizzy's
You dont have to use a electronic dizzy with the 14cux if you cant find one a points one will work.
Just make sure you have the right oil pump drive at the bottom of the dizzy to suit your oil pump