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Author Topic: V6 MIL light on, caught in log  (Read 504 times)

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Peter13

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V6 MIL light on, caught in log
« on: 23 April 2011, 21:48:16 »
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 "My Naff Code Reader" 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!


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Lazydocker

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Re: V6 MIL light on, caught in log
« Reply #1 on: 23 April 2011, 22:28:30 »
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 ;) ;)
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Whatever it is... I didn't do it

TheBoy

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Re: V6 MIL light on, caught in log
« Reply #2 on: 23 April 2011, 23:16:25 »
Does it do the same on petrol?
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Peter13

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Re: V6 MIL light on, caught in log
« Reply #3 on: 24 April 2011, 07:44:23 »
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?
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TheBoy

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Re: V6 MIL light on, caught in log
« Reply #4 on: 24 April 2011, 09:26:46 »
Quote
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
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Peter13

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Re: V6 MIL light on, caught in log
« Reply #5 on: 30 April 2011, 17:33:22 »
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?
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