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Author Topic: Fault on Fuel trim?  (Read 958 times)

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Rustymv6

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Fault on Fuel trim?
« on: 07 December 2009, 18:32:53 »
Hi my mv6 is showing a malfunction on fuel trim bank 1 and 2. Does anybody know what this is. I am trying to avoid main dealer.
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Welung666

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Re: Fault on Fuel trim?
« Reply #1 on: 07 December 2009, 18:43:36 »
What codes are you getting? P0420 and P0430 by any chance?
« Last Edit: 07 December 2009, 18:43:48 by Welung666 »
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Rustymv6

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Re: Fault on Fuel trim?
« Reply #2 on: 07 December 2009, 18:44:19 »
Yes thats them.
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Welung666

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Re: Fault on Fuel trim?
« Reply #3 on: 07 December 2009, 18:48:16 »
Can you weld ;D ;D

Easiest fix it to move the front lambda sensors back behind the cats, have a look here.....

http://www.omegaowners.com/forum/YaBB.pl?num=1253462747
« Last Edit: 07 December 2009, 18:48:43 by Welung666 »
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Rustymv6

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Re: Fault on Fuel trim?
« Reply #4 on: 07 December 2009, 18:56:27 »
Thank you ill give it a try.
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Welung666

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Re: Fault on Fuel trim?
« Reply #5 on: 07 December 2009, 18:58:18 »
Where are you Rusty? I've done a few of these now so would gladly help if you're local ;) :y
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Entwood

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Re: Fault on Fuel trim?
« Reply #6 on: 07 December 2009, 19:41:02 »
I get those warnings twice a year ... about 1/2 way into my French Holiday .. and 3 weeks after getting back ... then they just don't recur ....

IMHO it must have something to do with changing fuel, now as I run on LPG, and LPG as sold is a mixture of propane & butane .... I think the mixes in the two countries are different and the sensors pick the "change" in composition of the exhaust gases up as a failure.. once it is settled on to one or other it runs quite happily.

I'm wondering if small changes to fuel composition to those running petrol has the same effect ????

 :-/ :-/ :-/ :-/
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Kevin Wood

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Re: Fault on Fuel trim?
« Reply #7 on: 07 December 2009, 22:16:36 »
P0430 and P0420 aren't fuel trim but catalytic converter efficiency, and they are indeed common and not much to worry about.

Fuel trim (P017x IIRC), on the other hand, do indicate a fuel mixture or metering problem, and should be investigated.

Kevin
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Rustymv6

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Re: Fault on Fuel trim?
« Reply #8 on: 08 December 2009, 09:51:44 »
Hi it came on after a trip to leeds from Formby. I have cleared the fault and it hasn't come back on again. There is no running problems and after some fuel cleaner it seams ok. I had run the tank very low before I went if it could be some crap from the tank.
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