PROBLEM LPG SYSTEM

[gregray]

Hi
I have a problem with my car, whereby it gives the following fault from the code reader “Catalyst system efficiency below threshold (bank 1)”.

I have been able to obtain the following values from the sensors etc after the codes were removed:

Absolute throttle position 15.1%

Ignition timing 10º advance

Short term fuel trim bank 1 2.34% lean

Long term fuel trim bank 1 10.94% rich

Intake air temperature 35ºc

Bank 1 sensor 2 0.720 V



Before the codes were removed, the values at the point of the DTC occurring were:

Absolute throttle position 15.1%

Ignition timing 10º advance

Short term fuel trim bank 1 3.91% rich

Long term fuel trim bank 1 8.59% rich

Engine speed 1808.50 Rpm

Vehicle speed 25 Mpg

Intake air temperature 31ºc



I look forward to any feedback. I have posted this onto the site honestjohn, (http://www.honestjoh...dex.htm?t=86617) but nobody could respond.


Thanks

Greg

[mak-uk]

Hi Greg,

What car is it?

That particular trouble code, as the name suggests, is usually to identify faults with the cat(s). However, the best way to test it all out if you use LPG is to clear all the error codes and then run on petrol for a while and see if the errors occur - this is to determine if the LPG system is contributing to the errors or if it's a 'genuine' error with the petrol system which will obviously manifest with the LPG system too.

Mak

[gregray]

The system is made up of the following units:
The control unit is a BRC Sas equipment (2 ent, sequ 4) is stated on the controller. It is a sequential setup.
The vapouriser is a Genius 6AG 11200 mbar with serial 8055 on it.

I hope this of use.
Greg

[tubbs]

Greg, what year is the car ? You have a problem with the fuel trims being too far out on petrol when it's on gas.