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[autotech]

hi  wondered if anyone can help me
have a 2002 mv6 auto
which has an lpg conversion system fitted
the system causes the emission control system on the car to give out the following codes and definitions

P1700      Transmission Indeterminate Failure (Failed to Neutral)
P0430      Catalyst System Efficiency Below Threshold (Bank 2)
P0420      Catalyst System Efficiency Below Threshold (Bank 1)
P0141      O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

ignore the p1700 this has been rectified with a new gear selector switch
the other 3 are caused by the lpg system
as lpg is less combustive than petrol therefore gives off way less co2 this is causing the system to notice that the emissions are below what they should be

therefore i am looking for a mil(malfunction indicator lamp) eliminator
when a car with fuel injection systems and fuel management systems is fitted with an exhaust system with a de-cat there is a call for such a device which fools the ecu into thinking that the values sent out by the lambda(co2 oxygen sensor) are correct when they are not


if anyone knows of where i can get such a device please mail me
all help would be much appreciated

a_watson10@hotmail.com

[Kevin Wood]

It might be worth having a read of this: http://www.omegaowners.com/forum/YaBB.pl?num=1223977027/2#2

Cat efficiency codes are normally down to the pre-cats not working as well as they should and the permanent fix is to re-locate the post-cat lambda sensors to behind the main cats. In my experience LPG and petrol behave the same so if this is occurring more on LPG it may be an indication that the LPG system is not accurately mapped.

As for the heater circuit code this baffles me, as this implies a break or short in the Lambda sensor heater circuit itself. I can't see how this wouldn't be the same regardless of fuel unless there is a wiring error in the LPG system.

By the way, the post-cat lambda sensors don't sense CO2 and should behave the same on LPG or petrol. They measure residual oxygen in the same way as the main lambda sensors do. I have never heard of a mil eliminator but it sounds like an alternative solution to relocating the lambda sensors.

Kevin

[autotech]

yeah it had come to my mind about the lpg being incorrectly mapped when i get some time i will try relocating the o2 sensors as for the circuit malfunction this has ben rectified
but the way the lpg was fitted looks naff
relays hanging by their wires, solenoids not fastened correctly

[Kevin Wood]

yeah it had come to my mind about the lpg being incorrectly mapped when i get some time i will try relocating the o2 sensors as for the circuit malfunction this has ben rectified
but the way the lpg was fitted looks naff
relays hanging by their wires, solenoids not fastened correctly

I would try correcting the LPG mapping first. Could be that's what's upsetting the pre-cats. They don't usually fail on 2.6s. 3.2s are the main culprits although a few 2.6s have gone that way too.

If you have a code reader that can view live data have a look what the  fuel trim values are doing on LPG.

I know what you mean about LPG installs. Many are not up to an acceptable standard due to the LPGA being very lax about upholding their own standards IMHO. One of the reasons I converted mine myself.

Kevin

[Martin_1962]

My last car was not good and professionally done, current one is DIY and works fine.

Says it all I think