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Author Topic: Possible lambda fault  (Read 3009 times)

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tigers_gonads

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Possible lambda fault
« on: 03 April 2017, 12:55:42 »
Went for a drive yesterday to blow the cobwebs off the car  :-X :D

Coming back, I got myself stuck in pretty slow moving traffic  :(

While slowly moving along, the EML light came on and stayed on. In itself, the car was running smooth with a nice idle.
The car started first time this morning and run great with no EML lights but I did pull off these codes .........

P0150 - (F)  02 Sensor Circuit Slow response (Bank 2 Sensor 1) Present
P0150 - (7)  02 Sensor Circuit slow response (Bank 2 Sensor 1) Intermittent

After todays drive, I could not replicate the fault  :-\

Are we looking at a straight sensor replacement or something else since I could not get the fault to return ?

The car was running on LPG at the time.
I didn't get time to check the live data but I will look later if I get chance  :)
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Marks DTM Calib

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Re: Possible lambda fault
« Reply #1 on: 03 April 2017, 13:15:19 »
If running on LPG then it hints more towards the LPG side.
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tigers_gonads

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Re: Possible lambda fault
« Reply #2 on: 03 April 2017, 13:29:33 »
Quote from: Marks DTM Calib on 03 April 2017, 13:15:19
If running on LPG then it hints more towards the LPG side.



Ah 'dangle berries'  ::)

I've not checked the lpg map since I was at yours a few weeks ago  :-\

I'll check later and report back  :)
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TheBoy

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Re: Possible lambda fault
« Reply #3 on: 03 April 2017, 18:11:18 »
Compare lamda response on petrol and gas.  I suspect the map is out on LPG side.
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tigers_gonads

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Re: Possible lambda fault
« Reply #4 on: 04 April 2017, 11:23:06 »
Off out in it later
I will check then  :y
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tigers_gonads

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Re: Possible lambda fault
« Reply #5 on: 07 April 2017, 14:07:38 »
Right, finally got around to this  ::)

Took it for a run to get it nice and hot, plugged it in and powered up the software.

Gas pressure @ 95 degree's / idle was 1.2 bar so maybe a little high  :-\
I will tweek it down closer to 1.1 bar when I get chance / find my pigging 4mm allen key socket  >:(

The Petrol / gas map was a good 5mm out right at the bottom of the revs scale. (LPG rich)
This has been tweeked down and the lpg map display deleted so I'll see what it shows up like after a good drive when I get chance.
The rest of the map was pretty much perfect.

I did notice that the No2 lambda sensor seemed to be slower / not switching through the full 0 - 1 volt range at idle.
It might be down to the map been out though so i'll check this again when I get chance.

Cheers  :-*
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tigers_gonads

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Re: Possible lambda fault
« Reply #6 on: 25 April 2017, 17:45:17 »
It came back on the run home from skeg vegas this Sunday afternoon  :(
Same codes.
Same driving style too. Light throttle / high gear  :(
I'll check the gas map when I get chance be I would be surprised if its out by much if at all  :-\

I know the engine ecu coolant temp sensor is starting to play up and needs changing.
Could this affect things ?
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Kevin Wood

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Re: Possible lambda fault
« Reply #7 on: 26 April 2017, 16:00:14 »
Yes, might do. If the coolant temperature is reading wrong, the ECU might expect the lambda sensors to wake up quicker than in reality.
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tigers_gonads

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Re: Possible lambda fault
« Reply #8 on: 26 April 2017, 18:42:21 »
Quote from: Kevin Wood on 26 April 2017, 16:00:14
Yes, might do. If the coolant temperature is reading wrong, the ECU might expect the lambda sensors to wake up quicker than in reality.




Cheers Kev
Mark noticed it on the last tech 2 session.

Revs all over the place between "once it starts to warm up" until "nice and hot".
Changed the MAF but made little difference.
No air leaks apparent.

Okay, about time I did the breathers so best get on with it  ::)

Best place / price for a V6 ecu temp sensor please ?
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Kevin Wood

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Re: Possible lambda fault
« Reply #9 on: 27 April 2017, 14:29:34 »
The temp sensors rarely fail so I'd go for a 2nd hand one, personally.

This is assuming it's actually the sensor. Would be worth checking the resistance of the wiring back to the ECU first, and possibly checking the resistance of the sensor at various temperatures.
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BazaJT

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Re: Possible lambda fault
« Reply #10 on: 27 April 2017, 19:16:51 »
If you're talking about the sensor that lives on the coolant bridge alongside the sender unit for the dashboard display then they run from just under £7 up into the mid £20's.
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Doctor Gollum

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Re: Possible lambda fault
« Reply #11 on: 28 April 2017, 00:57:00 »
Seconded, and easy enough to fit with plenum off for breather cleaning :y
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tigers_gonads

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Re: Possible lambda fault
« Reply #12 on: 28 April 2017, 18:01:26 »
Quote from: Kevin Wood on 27 April 2017, 14:29:34
The temp sensors rarely fail so I'd go for a 2nd hand one, personally.

This is assuming it's actually the sensor. Would be worth checking the resistance of the wiring back to the ECU first, and possibly checking the resistance of the sensor at various temperatures.



From memory, there are 2 sensors screwed into the coolant bridge.
One has the wire attached via a crimp that slides on, the other iirc has a plug  :-\
Anyone remember which one is which ?

I should have a old coolant bridge off a 3ltr in the shed somewhere  :-\
Same one ??
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tigers_gonads

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Re: Possible lambda fault
« Reply #13 on: 28 April 2017, 18:02:05 »
Quote from: BazaJT on 27 April 2017, 19:16:51
If you're talking about the sensor that lives on the coolant bridge alongside the sender unit for the dashboard display then they run from just under £7 up into the mid £20's.


Thanks bud  :)
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tigers_gonads

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Re: Possible lambda fault
« Reply #14 on: 28 April 2017, 18:03:02 »
Quote from: Doctor Gollum on 28 April 2017, 00:57:00
Seconded, and easy enough to fit with plenum off for breather cleaning :y



That's the cunning plan  ;D
I'll check that gearbox plug while I'm under there too  :-X :-[
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