P38A LPG removal?

JohnM70 · Sep 27, 2018

Chaps,
I have a sniff of a 99/V P38A that has some problems, chief of which is that it don't run.
It transpires that at one time it had lpg but persons unknown have removed bits of it (not sure how much)

This is a very cheap motor and I'm not 100% convinced it's what I'm after anyway...

How hard is it to remove the LPG system and revert to petrol?

TIA

The Mad Hat Man · Sep 27, 2018

@Saint.V8

johnnyb70 · Sep 27, 2018

Straightforward. The gas nipples are drilled into the inlet these will need plugging. The injector wiring is interupted. So one injector wire is cut then 2 wires from the lpg loom are connected to each wire. The coolant lines are cut to incorporate the vapouriser. The lpg loom will have a fused live wire( somewhere!) The rest is independent of the petrol side. The tanks are normally closed so shouldn't leak when you cut the pipe.

Saint.V8 · Sep 27, 2018

Pretty much what he said!

LPG systems are very simple in their operation, they interupt the injector signal, and fire an LPG injector instead, but feed back to the Engine ECU that an injector has fired!

Now there are two main types of emission control on LPG systems - OBD based and O2 sensor based......so as well as removing the injector interupt wiring, there may be wiring to the O2 sensors, either via piggybacks or tapping into the Engine ECU Loom, or connections to the OBD inputs/outputs to the Engine ECU wiring loom too.

Grrrrrr · Sep 28, 2018

Probably easier just to leave it be but switched to petrol.

The Mad Hat Man · Sep 28, 2018

Grrrrrr said:
Probably easier just to leave it be but switched to petrol.

It doesn’t run!

Grrrrrr · Sep 28, 2018

The Mad Hat Man said:
It doesn’t run!

Yes but the LPG shouldn't stop it. As Saint says, it just piggy-backs so switched off it should run normally on petrol.

The Mad Hat Man · Sep 28, 2018

But it dont

JohnM70 · Sep 28, 2018

I'm of the view that I need a working vehicle first, before swearing at a broken P38

sassanach · Sep 28, 2018

if the lpg ecu has been removed then it will not run until the injector wiring has been restored.

oakey · Sep 28, 2018

I would join the wires that were used to insert the gas injectors into the petrol injector system . Should give you solely petrol injectors

P38A LPG removal?

JohnM70

Well-Known Member

The Mad Hat Man

Well-Known Member

johnnyb70

Well-Known Member

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Grrrrrr

Technician, Bodgit & Scarper Ltd

The Mad Hat Man

Well-Known Member

Grrrrrr

Technician, Bodgit & Scarper Ltd

The Mad Hat Man

Well-Known Member

JohnM70

Well-Known Member

sassanach

Well-Known Member

oakey

Well-Known Member

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