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Author Topic: Fuel trim malfunction??  (Read 2025 times)

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RobseyMV6

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Fuel trim malfunction??
« on: 06 January 2011, 22:49:37 »
P0170 Fuel trim malfunction (Bank 1)
P0173 Fuel trim malfunction (Bank 2)

Has come up on my 3.2 auto and is acting funny after 4000rpm just won't go just holds back like a limp mode maybe but will still speed up once in high gear....
Any ideas what the problem may be???
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Welung666

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Re: Fuel trim malfunction??
« Reply #1 on: 06 January 2011, 23:05:56 »
Fuel trim errors can be caused by several things...

Any zorst leaks can exagerate the symptoms. First port of call is the MAF/air intake temp sensor though. Can you get any live data on those 2?
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RobG

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Re: Fuel trim malfunction??
« Reply #2 on: 06 January 2011, 23:10:21 »
As Lee says. Also check the rear multi-ram re; holding @ 4K revs
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RobseyMV6

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Re: Fuel trim malfunction??
« Reply #3 on: 06 January 2011, 23:13:04 »
Thanks will look at this tomorrow, will replace maf and temp with one i have here and report back, thank you! :y
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Welung666

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Re: Fuel trim malfunction??
« Reply #4 on: 06 January 2011, 23:13:37 »
Quote
As Lee says. Also check the rear multi-ram re; holding @ 4K revs

That was going to be step 2 ;) ;D
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RobG

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Re: Fuel trim malfunction??
« Reply #5 on: 06 January 2011, 23:14:39 »
Quote
Quote
As Lee says. Also check the rear multi-ram re; holding @ 4K revs

That was going to be step 2 ;) ;D
Good to be one step ahead :D ;D
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Kevin Wood

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Re: Fuel trim malfunction??
« Reply #6 on: 07 January 2011, 10:40:58 »
Yep, if you have a spare MAF lying around it's certainly worth trying. Bear in mind that it will have built up a large fuel trim, so it might run a little odd after the MAF change too. If you've got a code reader, clear the codes when you change the MAF as this also resets the fuel trims. :y

Kevin
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kcl

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Re: Fuel trim malfunction??
« Reply #7 on: 07 January 2011, 12:30:36 »
My money is on MAF, replace it and no more 0170/0173  :y
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Proz

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Re: Fuel trim malfunction??
« Reply #8 on: 07 January 2011, 14:17:34 »
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My money is on MAF, replace it and no more 0170/0173  :y


Yep mine too  :y
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Marks DTM Calib

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Re: Fuel trim malfunction??
« Reply #9 on: 07 January 2011, 15:54:50 »
Indeed.

For both faults to appear at the same time it needs to be a single item which affects both banks.....thats the MAf (as pretty much everything else is duplicated on a per bank basis)
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RobseyMV6

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Re: Fuel trim malfunction??
« Reply #10 on: 07 January 2011, 19:22:54 »
Update:

Changed maf
changed ecu
changed gearbox ecu

Unpluged battery with every change not EML light has gone but still will not rev fast over 4000rpm and won't change gear.... would it be low on ATf in gearbox? its just holding back, so odd with all that has been replaced!

No air temp sensor on this omega
Fuel filter??
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Welung666

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Re: Fuel trim malfunction??
« Reply #11 on: 07 January 2011, 19:24:19 »
Quote
Update:

Changed maf
changed ecu
changed gearbox ecu

Unpluged battery with every change not EML light has gone but still will not rev fast over 4000rpm and won't change gear.... would it be low on ATf in gearbox? its just holding back, so odd with all that has been replaced!

No air temp sensor on this omega
Fuel filter??

Yes there is ;) It's built into the MAF.
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RobseyMV6

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Re: Fuel trim malfunction??
« Reply #12 on: 07 January 2011, 19:28:27 »
 ;D ;D then i need  :y
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Welung666

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Re: Fuel trim malfunction??
« Reply #13 on: 07 January 2011, 19:31:52 »
Are the rear multi-rams kicking in when you hit 4k rpm?
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Marks DTM Calib

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Re: Fuel trim malfunction??
« Reply #14 on: 07 January 2011, 19:46:31 »
When was the fuel filter last changed?
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