Thread: D2 4.6 conversion owners. 4.6 ECU swap & EOI.

Pedro
it runs/Idles ok on gas up to about2k revs then misses a bit and changes back to petrol
an ass>umption on my part about the lean bit,,thinking old school there.
i'll get it to the gas man when i finish wiring in the Harman Kardan amplifier and head unit all 956 wires of it.
Good old "She'll be right" should only take an hour or so>>>NOT!!

Originally Posted by Modelsp

Pedro
it runs/Idles ok on gas up to about2k revs then misses a bit and changes back to petrol
an assumption on my part about the lean bit,,thinking old school there.!

The sequential kits I've played with all rely on the pressure sensor for the vapour injection rail, they drop out when the pressure drops below a preset value. The leaning out/missing would be a result of the pressure drop. The LPG ECU wouldn't react to the lean mixture on its own.

Possible reasons for a pressure drop are

1. out of LPG

2. a helpful serviceman has shut off the main hand tap at the LPG tank, only not very tightly.

3. The excess flow valve at the LPG tank has tripped and needs a few goes on gas at idle to reset itself

4 . blocked filter in the main gas lock valve

5. dodgy (failed rubber seat in the) shut off plunger in the main gas lock

6. Converter internal blockage/damaged valve

7. Blocked inlet filter of the LPG tank shutoff valve

8. Broken pickup pipe at the LPG tank allowing only vapour into the system.

I would start by running the LPG for a short while, then stopping the engine and cracking open the line from the tank to the main gas lock. There should be plenty of liquid LPG present here, not just a short hiss of vapour.

In addition to sizing of the inlet tract, consider the IACV (as I have been recently). It's orifice is about 20mm inlet and 15mm outlet. And it'll not only idle but with the TB inlet blocked but operating the butterfly it will breathe to over 2000rpm (without load) through the IACV hoses.

Sorry a bit late responding ,,but yes P38 lid fits straight on to the 4.6 maf sensor and original filter box.

Originally Posted by Modelsp

Sorry a bit late responding ,,but yes P38 lid fits straight on to the 4.6 maf sensor and original filter box.

Woo! Hoo!

Great thread. Is there any difference in the size of the throttle body intake? If not what is the point of a higher volume plastic intake tube?

Cheers

Originally Posted by ozscott

Great thread. Is there any difference in the size of the throttle body intake? If not what is the point of a higher volume plastic intake tube?

Cheers

First of All Credit for the Airbox Lid information goes to Erich(Bundalene)as it was he who assisted me with this and a lid last week.
As for the Throttle body i'm unsure as the only advice from Mark Adams was to upgrade to the bigger MAF.=4.6ltr one.for the better fuel/air ratios
I think its not that relevant after the MAF as you can just open the throttle more if needed,(See >>>Drive it like you stole it).
cheers
Paul

IIRC the throttle bodies are the same size,,
I'm sure LR had their reasons for the bigger inlet pipe