FAULT CODE PO171
18 October 2013, 07:02 PM
#1
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FAULT CODE PO171
Hi all had my cars ecu read today and the above code came up
I have read it means it's over fueling / to much air in exhaust system
What could be causing this the mods I have are as follows also plan to map for the med next week
K&n panel filter
Sti top mount
Decated from 1st cat back
And a turbosmart DV which I'm removing once get hold of standard recirc
Any tips would be great
The ecu has been reset and light has not come back on after 20 miles
Many thanks in advance
I have read it means it's over fueling / to much air in exhaust system
What could be causing this the mods I have are as follows also plan to map for the med next week
K&n panel filter
Sti top mount
Decated from 1st cat back
And a turbosmart DV which I'm removing once get hold of standard recirc
Any tips would be great
The ecu has been reset and light has not come back on after 20 miles
Many thanks in advance
18 October 2013, 07:15 PM
#2
it's not over fueling its running lean which = more air than fuel.
P0171 system too lean bank 1
Has this fault only occurred after fitting mods if so the car wont be setup for these so that car wont know what it's doing, I'd suggest going over all of the intake system pipework after the maf sensor and checking for potential vacuum leaks
P0171 system too lean bank 1
Has this fault only occurred after fitting mods if so the car wont be setup for these so that car wont know what it's doing, I'd suggest going over all of the intake system pipework after the maf sensor and checking for potential vacuum leaks
18 October 2013, 07:31 PM
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The guy I brought it from said he had it switched off a week before I brought it after a garage looking it over and the day I viewed the car is was not on but when I picked the car up next day it was on he said he went on quite a long drive ( means use the fuel up lol )
So I'm a bit mift what it is I was thinking it was the decat causing the problem but now find out that the first cat is still in so really don't know I have checked all pipes ect can't find any leaks
So I'm a bit mift what it is I was thinking it was the decat causing the problem but now find out that the first cat is still in so really don't know I have checked all pipes ect can't find any leaks
18 October 2013, 08:47 PM
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Yeah, the VTA valves can cause rich and lean scenarios. Rich once you lift off the throttle when changing gear for example and lean when at cruising speed/load (off boost) as the BOV will be open and unmetered air can be induced through it.
18 October 2013, 10:02 PM
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Yer I'm thinking the DV was not helping at all sourcing standard recirc try that as I say light is off at the moment so interesting to see if it comes on again without the baileys
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20 October 2013, 07:21 PM
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Well few days later and still no light on gave everything a clean yesterday so fingers crossed it was just one of them things Now looking forward to my remap tomoz I'm a map virgin so looking forward to see how it all work 
20 October 2013, 07:45 PM
#10
Who's mapping it? Rollers or road? If it keeps acting up may be a a MAF. The mapper will be able to shed some light on it anyway.
20 October 2013, 07:52 PM
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Getting it mapped by Duncan at racedynamix tomorrow at surry rolling road
Heard good things about him I'm well looking forward to it and it's my birthday tomoz so brilliant self bday pressie
Heard good things about him I'm well looking forward to it and it's my birthday tomoz so brilliant self bday pressie
21 October 2013, 05:34 PM
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Good to meet you to mate car drives AWSOME very responsive and pulls like a train
Can't praise you enough mate
Now my car drives like a Subaru finally lol
Again top job mate
See you again soon
Can't praise you enough mate
Now my car drives like a Subaru finally lol
Again top job mate
See you again soon
21 October 2013, 07:46 PM
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Here is the difference between before Duncan mapped and after
Here is before
As you can see less than standard output very odd lol
But then Duncan done his bit and ......
A big change in the car all round and brilliant considering very subtle mods and a cat still fitted can't wait till jan/feb when I get the new turbo
Highly recommend Duncan at racedynamix great value and friendly service and a thank you to the other guys who name I did not get
Here is before
As you can see less than standard output very odd lol
But then Duncan done his bit and ......
A big change in the car all round and brilliant considering very subtle mods and a cat still fitted can't wait till jan/feb when I get the new turbo
Highly recommend Duncan at racedynamix great value and friendly service and a thank you to the other guys who name I did not get
30 October 2013, 01:22 PM
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Just this minute turned the eml off on mine for P0171.
drove home monday and all was well, started it first thing yesterday and the eml was on...
will keep an eye on it and see how it goes, it wasnt that long ago that i cleaned the maf sensor so ill check that again too.
drove home monday and all was well, started it first thing yesterday and the eml was on...
will keep an eye on it and see how it goes, it wasnt that long ago that i cleaned the maf sensor so ill check that again too.
30 October 2013, 08:29 PM
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Havin mine turned back of tomoz evening I have put the car back to recirc now so see if it comes back on if it does then try another route lol gl above poster let me know if you figure it out lol
30 October 2013, 11:32 PM
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No, none. I took the std dv off as it was jerky as hell on gear changes. Drove home today and it stayed off, will check the maf to see if it is dirty at the weekend if i remember lol
30 October 2013, 11:36 PM
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Defiantly with you on the gear changes with a DV fitted now I have moved back to recirc it's completely different much much smoother well good luck with finding the fault I will update if I find anything
well good luck with finding the fault I will update if I find anything
02 November 2013, 11:08 AM
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Just an update I cleaned the maf and checked for air leaks none found had the eml switched off again the code was po171 again so after putting the recirc on and cleaning the maf hopefully it will stay off this time.
02 November 2013, 02:32 PM
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One thing I have noticed now is that when I put my foot on the clutch coming upto roundabout or whatever revs drop right down to near stall then jump up to 800 it don't do this all the time but more than not any ideas anyone
04 November 2013, 08:56 PM
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Hmm, mine has been ok since so ive not even had chance to whip out the maf sensor.
Fingers crossed its something simple bud. are there any other fault codes?
Fingers crossed its something simple bud. are there any other fault codes?
05 November 2013, 09:35 AM
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checked code again this morning and reading po171 again I put £40 fuel which put my just under full tank and only done 144 miles and needs fuel again and I'm driving normal.
I'm sure it's something simple that I have missed
I'm free all day tomorrow or Thursday just let me know when suits you and if you want me to come to you or to me again thanks mate
08 November 2013, 05:55 PM
#30
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Just another big thanks to Duncan light still off seems to run better now and even idles better than ever has so hopefully all sorted.
Again big thanks much appreciated mate
Gavin
Again big thanks much appreciated mate
Gavin