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Author Topic: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)  (Read 34984 times)

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Doctor Gollum

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #45 on: 05 January 2025, 23:12:53 »

Back to the start, the errors P0170 and P0173 have appeared again after repairing the air leak and changing the two lambda sensors... I will ask the mechanic to change the air filter and clean the MAF sensor, maybe change the fuel filter too, I hope there isn't another hidden leak somewhere.
You assume you have found and fixed ALL the vacuum leaks.
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jandroa

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #46 on: 06 January 2025, 19:03:16 »

I will definitely ask the mechanic tomorrow to check for more vacuum leaks in the system.
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #47 on: 06 January 2025, 21:12:07 »

All the vacuum on the car comes from the intake/plenum. There are also several seal between the throttle body and the cylinder heads. Any one will allow un metered air in if not fitted correctly or in good condition.
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TheBoy

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #48 on: 07 January 2025, 15:04:00 »

Why? Maybe it is better to change it directly?
Many have tried, all have cried....
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Doctor Gollum

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #49 on: 07 January 2025, 19:09:40 »

Why? Maybe it is better to change it directly?
Many have tried, all have cried....
The original MAF on my Plod died,.so put a new Bosch one on that lasted six months, refitted the original one with no further issue.

That car did have a fault within the engine harness which was replaced whilst the new MAF was installed so it's possible that the original MAF was fine and the issue was actually elsewhere.
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jandroa

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #50 on: 13 January 2025, 12:25:04 »

The mechanic told me that the OBD2 was now reading a fuel system related code, so he started changing the fuel filter. Check engine light has gone for the moment and now is time to continue driving to see if the issue is resolved.
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Doctor Gollum

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #51 on: 13 January 2025, 12:38:34 »

The mechanic told me that the OBD2 was now reading a fuel system related code, so he started changing the fuel filter. Check engine light has gone for the moment and now is time to continue driving to see if the issue is resolved.
It helps to give the code if you're seeking advice ;)

I suspect a purge valve or charcoal canister issue as they are the only parts of the fuel system that might generate a system specific code unless you have a faulty injector.

That said, now the cambelt has been changed, and assuming it was set correctly, you may (not) find that the issue you had was corrected with the cambelt change and stemmed from incorrect timings.
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jandroa

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #52 on: 13 January 2025, 13:15:07 »

I'm sorry but he didn't told me the exact error code, he just told me it was related to the fuel system and this time he couldn't clear the code until he changed the fuel filter.

I will try to do as many kilometres as I can these days to see if the problem is solved.

Thanks!
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olm

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #53 on: 04 February 2025, 09:10:18 »

Hello, I continue to have problems with high LTFT, a problem that is aggravated in lpg. I have checked vacuum tubes and changed MAF and it remains the same. What else could a high LTFT produce? Any idea what else to look at? Do you think that the failure of a multiram valve could create it?
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Doctor Gollum

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #54 on: 04 February 2025, 10:23:34 »

Only if there's a vacuum line that you've missed.
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olm

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #55 on: 04 February 2025, 11:20:41 »

I haven't missed any, in fact when disassembling the multiram the air leak sounded when disconnecting the air accumulator pipe. Can there be a leak in the brake booster? I don't notice anything strange but I don't know what to think anymore
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cam.in.head

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #56 on: 04 February 2025, 12:27:33 »

from what i remember there is a part of the brake booster pipe that can rub through and cause a leak ?  if it's missing it's plastic bracket / spacer .
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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #57 on: 04 February 2025, 13:31:17 »

There's a take off for vacuum on the servo line.
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olm

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #58 on: 04 February 2025, 15:48:09 »

That vacuum line of the brake booster already broke down and affected the brake and the weather that only threw hot air at my feet in summer. Now I don't notice any of that, I can only think that some valve of the multiram can cause it, since it is the only thing I have left and that the problem is not continuous, maybe 3-4 times in these months it has gone well, but the next day bad again
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Doctor Gollum

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Re: Omega 2.6 V6 - P0170 and P0173 (Fuel Trim Malfunction Bank 1 & 2)
« Reply #59 on: 04 February 2025, 15:55:27 »

from what i remember there is a part of the brake booster pipe that can rub through and cause a leak ?  if it's missing it's plastic bracket / spacer .
This. It rubs through against an AC line iirc
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