Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: andy3264 on 08 March 2010, 17:22:56
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Hi all, been a long time since been on so here goes. Car failed emmisions on mot test, changed lambda sensor after code reader said it was knackered. Emmisions still too high but hav dropped considerably to what they were, now have code numbers P0170 fuel correction bank 1, and P1555 throttle valve control motor position nominal vs actual comparison.
Can anybody please tell me what needs changing to get rid of these codes and get my emmisions down, would be much obliged all :-/
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Probably worth clearing those codes, see what returns.
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They did clear the codes and they returned, any ideas?
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They did clear the codes and they returned, any ideas?
On my 2.2 the code P0170 was cured by a new air flow meter :y
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Thanks for that proz :y
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I was getting lots of problems with the code P0170 last year ..... i saw a genuine air flow meter on egay going cheap and decided to take the chance with.... thankfully for me cured the problem ... car felt better for it too , more responsive .. it was guttless before .... the car never threw up any code for air flow meter so i guess it was still working well enough not to throw up a code for it .
Not sure about the P1555 though :-/
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what can i expect to pay for an air flow sensor proz?
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what can i expect to pay for an air flow sensor proz?
Last year i think Vx wanted around the £60 mark on tc .... i got mine on egay sealed in Vx box for about £40 . :y
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hav found my code list and code P1555 is throttle postion sensor, do you know where this is proz?
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Right, before changing parts willy nilly, you need to get a live data reading on the MAF/Lamda/injector pulse/throttle positions v pedal positions
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Is there anywhere local you know of I can get one done? :-/
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Is there anywhere local you know of I can get one done? :-/
Was hoping somebody nearby with good enough equipment would have volunteered :-/
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It would have been handy if someone with same car near by could compare maf values etc .... i would have gladly helped but your a bit far away .... if you can get someone to get live data i can compare it to mine and see what it shows ... im sure i posted up some of my live data when i had this problem but the chances of finding a post so long ago would be slim i think .... i'll try and look though :y
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Thanku proz
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Andy, is Dudley close enough? I can do your live data for you mate :y
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Thanks for the offer wellung, when can you do it and what cost ;)
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Thanks for the offer wellung, when can you do it and what cost ;)
Everybody spells it wrong ;D ;D
Whenever you're free, I work split shifts so can do daytime as well as evenings. Call it a pint ;) :y
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How r you fixed Wednesday after five?
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How r you fixed Wednesday after five?
Make it after 6 and I'm fine ;)
I'll PM my number, give me a call tomorrow and we'll arrange it all then :y
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Very much obliged welung, will speak tommorow
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It was very nice meeting you Andy :y
Now for the results...
(http://i115.photobucket.com/albums/n282/doris_minor/Andy.jpg)
A couple of things we did notice though. 1) the 0155 (TPS) fault only came up when you held the RPM around the 1k mark for more than a few seconds so I'd say it was either a dirty contact or the PCB is failing in that area. 2) Watching the live data when the 0170 came up the 02 sensor loop was dropping to closed from open at the exact moment the 0170 reappeared. Pre-cat sensor is new, so could it be the post cat sensor causing it?
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A very big thankyou for last night lee, now can anyone give me any ideas from the live data posted by Welung666 :y
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Can you tell me what you think The Boy. from the live data that welung has posted for me :y
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P0170 won't be affected by the post cat Lambda sensor.
I'm guessing the fuel trim is going out of range which drops it into open loop and triggers the code.
Is the coolant temperature sensor reporting plausible values?
Also - can you monitor the fuel trim value? Just wondering which way it's going and under what conditions you get a large fuel trim?
MAF reading is perhaps a little low. A while since I've seen one on a 2.2 but I'd say 12 Kg/h would be more typical at a hot idle. Maybe the MAF is getting lazy and resulting in a large fuel trim to keep the mixture correct?
When it goes open-loop and the P0170 appears does the idle change at all? Does it hesitate, go lumpy, cough back through the intake, etc?
Kevin
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Hi Kevin, it doesnt seem to cough back but does run a bit lumpy :y
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Coolant temp. seemed normal at the time, fuel trim value said normal until the lambda circuit went open the showed lean. This happens once warm and under any circumstanses, be it idle or varying speeds of fast idle.
Just a thought Andy, does it run rough when first started from cold?
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Yes it does run rough or lumpy sometimes from cold Lee.
Is the conscensous that i should change the maf sensor and go from there? :-/
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Yes it does run rough or lumpy sometimes from cold Lee.
Is the conscensous that i should change the maf sensor and go from there? :-/
Sorry for the delay in answering, missed this dropping off the bottom of the page. Next time you start from cold (I.E. in the morning) unplug the MAF before you start it up. See if it runs smoother than normal.
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Thanks for getting back to me Lee :y
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So did you try it?
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The TPS error is concering as with this as a fault, the ecu may drop to a default map......and this would be open loop which might explain the failures.
Charting live values would be interesting so we could see a graph showing the throttle opening progression.....against MAF and lambda (note, without flooring the throttle pedal)
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I unplugged the maf last night after getting home from work and left it untill this morning. Started fine and acceleration has vastly improved also Lee :)
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99% it's the MAF then, although I'd like to (at some point) chart the TPS against maf and lambdas as Mark has suggested.
Have a look on eGay, you can pick up new MAF's for the 2.2 for about £35.
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Will do Lee, and will try and sort when i can get over to you so you can map the other things,and thanks again for all your help :y
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Quick question Lee, is the maf sensor for diesel 2.2 the same as a petrol as can only see these unless you happen to know the part number for the maf sensor i need :y
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Diesel MAF is different. Original Vx part number is 90530463 but double check on yours, it's stampted on the flat part just about the plug :y
EDIT: eGay listings ..... http://shop.ebay.co.uk/?_from=R40&_trksid=p3984.m38.l1313&_nkw=90530463&_sacat=See-All-Categories
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Vx part number is:
90530463 (77.53+ vat trade club). (Siemens 5WK9606)
giving the following options:
http://desc.shop.ebay.co.uk/i.html?_nkw=90530463&_sacat=0&LH_TitleDesc=1&_trksid=p3286.m270.l1313&_dmpt=UK_CarsParts_Vehicles_CarParts_SM&_odkw=90530463&_osacat=0&_rdc=1
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Thanks guys, have fitted new maf sensor, emmisions light has gone off on dash itself, fuel consumption down and performance improved. Am taking it back today for emmisions check and hopefully pass mot :y
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Thanks guys, have fitted new maf sensor, emmisions light has gone off on dash itself, fuel consumption down and performance improved. Am taking it back today for emmisions check and hopefully pass mot :y
Fingers crossed for you Andy :y
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Thanks guys, have fitted new maf sensor, emmisions light has gone off on dash itself, fuel consumption down and performance improved. Am taking it back today for emmisions check and hopefully pass mot :y
Fingers crossed for you Andy :y
Any news yet Andy?
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no news yet Lee, had to book in for retest on tuesday, will keep you upto date Lee. Thanks again :y
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Passed mot Lee thanks to your help, but one small thing is that my spanner light comes on every now and then when starting. Have to turn off then on again to clear. Am going away for a few days over easter but would like you to have another look with your gizmo and try to bottom this one out please after easter.
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Had the same problem with my 2.2 a few months back - spanner light coming on when warm and 155 code - throttle position sensor. I took the throttle body off and cleaned it and the breathers. The throttle body didn't look too bad, but there was a little crud on it which might have stopped the butterfly closing properly - make sure the small hole under the butterfly is clear also. Anyway, long story short, the code cleared and the spanner light has never been seen since.
Might not be the same on yours, but just a thought.
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That was the plan swampy :y Going to get some live data off it first at various throttle positions to compare then gibe the TB and breathers a good cleaning and re-do the live data.