Hello Guys,

I have been concerning since I have got my car that very rarely I get MIL on. This happens usually when I drive uphill
above 2500 rpm rev.
Today I let my wife to drive, and I was sitting on the passengers side with my laptop and op-com connected, waiting for the road section where this happens usually.
As expected after driving up for 15-20 seconds the light was on and had been on for approx 3-5 seconds.

The logfile converted to xls is put here:
http://landboyz.4step.hu/check_engine/

I see in the log from around row 1100, that one of the O2 sensors shows LEAN ratio constantly and the other O2 loop is open for a while just before I get the light on.

Are there any hints what could be the reason of this?
The car is running on LPG, O2 sensors just replaced.

thanks!

Without even looking at the file, if it's showing lean running you need to fix that ASAP! Leaning out could be as simple as the LPG needing recalibrating and mapping again ;) ;)

Does it do the same on petrol?

I tried several times to switch to petrol when the MIL was on, and it went off.
If I decrease the acceleration a tiny bit, it also switches off.
Honestly, I don't drive on petrol except starting.

I was thinking the same, that the fuel map for the LPG has to be finetuned, but my concern is why only one cylinder row goes lean?

Peter13 wrote on 24. Apr 2011 at 07:44:

I tried several times to switch to petrol when the MIL was on, and it went off. If I decrease the acceleration a tiny bit, it also switches off. Honestly, I don't drive on petrol except starting. I was thinking the same, that the fuel map for the LPG has to be finetuned, but my concern is why only one cylinder row goes lean?

You need to prove that it only happens on LPG, and never happens on petrol. If you mis diagnose that part, you will be chasing your tail forever

You were right.

It does the same on petrol! One of the two loops goes to open. The #2 sensor voltage keep between 420 and 500mV.

Any ideas?