Yet another MOT emissions failure.

Started by VVT-i, June 29, 2009, 17:44

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VVT-i

June 29, 2009, 17:44 Last Edit: January 1, 1970, 01:00 by Guest
Fast Idle Test: FAIL

CO Level = 0.02% PASS (min -  max 0.30)
HC Level = 44ppm PASS (min - max 200)
Lamda = 1.34% FAIL (min 0.97 max 1.03)


Second Fast Idle Test: FAIL

CO Level = 4.64% FAIL (min - max 0.30)
HC Level = 107ppm PASS (min - max 200
Lambda = 0.89 FAIL (min 0.97 max 1.03)


Natural Idle Test PASS

CO Level 0.43% PASS (min - max 0.50)

Specifications.

Power Enterprise Turbo
Innovate Wideband Kit


I also have banks 1 and 2 running too lean (PO171 and PO174) so assume I need a new O2 Sensor, I previously swapped out the MAF with the wifes (wifes car has no problems with mine in it) I have changed a few hoses incase of vac leaks etc.. at least this is what I was thinking untill the mechanic enquired why I had an o2 sensor not connected into the manifold. I told him this was because I had the wideband kit fitted and the signal wasn't being used but the sensor heater circuit was required. (I know some of you have fitted a resistor) the mechanic thinks that to be strange, but admits it is something he hasn't had a lot of dealings with. and thinks the o2 sensor is sending a signal back to the ECU saying all it is reading is oxygen.

Before I go spending my hard earned cash on a couple of sensors, why is this o2 sensor not connected into the manifold?.. Was I right.. is it because I have the wideband, or should it still be in the manifold?  is the Lambda FAIL caused by this sensor?  If I posted the live data from my code reader will help get to the bottom of it?
2005 MR2 Roadster  (Black)
P.E. Turbo and other stuff that gives 234BHP  \";)\"

Quote from: \"Wabbitkilla\"Mine is a bit stiff when cold, but once it\'s warmed up it slips in nicely.

spit

#1
June 29, 2009, 18:06 Last Edit: January 1, 1970, 01:00 by Guest
You're right that the only purpose of the unconnected O2 is to avoid a heater circuit CEL.

The reason for only one O2 in the system is that you're reading both banks combined (post-turbo). Trying to tell the ECU that it still has separate banks from a combined exhaust gas is at best lumpy and at worst piston-melting temperatures  s:shock: :shock: s:shock:  (having learned the hard way   s:oops: :oops: s:oops:  ).

Your O2 feed to the ECU is joined up in the harness, so the ECU is seeing both 'banks' the same.

The dangling sensor is contributing nothing to the ECU voltage - its reading air which equates to a voltage of bugger all !
1999 MR-S with added C2 POWΣR

Humbled recipient of the Perry Byrnes memorial trophy (2007 & 2011)

VVT-i

#2
June 29, 2009, 18:11 Last Edit: January 1, 1970, 01:00 by Guest
Just as I though then, thanks Ste... I guess I only need 1 new o2 sensor then (as I'm not getting the heater circuit error) I might just swap them over... IE,, unplug the one from the manifold and swap it for the dangler (ooh err lol) and see what happens.

QuoteYour O2 feed to the ECU is joined up in the harness, so the ECU is seeing both banks the same.

I take it by that you mean the wires are joined together as it enters the ECU making banks 1 and 2 into the one.

I'm trying to understand what happens to the o2 reading from the dangling sensor.. I take it the signal has been disabled in some way leaving just the heater side of it operational?.. only asking so I can explain it to the mechanic.
2005 MR2 Roadster  (Black)
P.E. Turbo and other stuff that gives 234BHP  \";)\"

Quote from: \"Wabbitkilla\"Mine is a bit stiff when cold, but once it\'s warmed up it slips in nicely.

spit

#3
June 29, 2009, 18:17 Last Edit: January 1, 1970, 01:00 by Guest
Quote from: "VVT-i"I take it by that you mean the wires are joined together as it enters the ECU making banks 1 and 2 into the one.

Yep that's correct.

I can't recall if the guys snipped your loose O2 signal and ground wires (blue and white) but you'll be able to confirm that. I don't think they did as I told them it wasn't necessary .... but you know Si and his passion for snipping things  s:lol: :lol: s:lol:  

Try a swap-over. The melting problem with 2 sensors reading the same stream arises when the O2s are mismatched as mine were - so the ECU trims each bank in opposite directions, gets to extremes and sends the engine into apoplexy.

Under the one-sensor system, I get "too rich" CELs if I use the 'wrong' one of my O2 sensors ..... using the other is fine. Might work for you too?

As for getting all emissions readings the same for MOT - its a black art - the crossover point where all are aligned is a very limited window  s:? :? s:?
1999 MR-S with added C2 POWΣR

Humbled recipient of the Perry Byrnes memorial trophy (2007 & 2011)

VVT-i

#4
June 29, 2009, 19:22 Last Edit: January 1, 1970, 01:00 by Guest
OK.. I've swapped over the o2 sensors (just unpluged them both and straight swap over) I've reset the ECU by disconnecting the battery (now idleing like a bag of bolts untill it learns lol) I will take it a run when I get time to, hopefully once it's all settled the CEL won't come back.

As for this black art.... clean the MAF then take the car for a good thrashing to get things nice and hot imeadiately before the test seems to be the way to find this window of opperchancity (well.. according to search anyway lol)
2005 MR2 Roadster  (Black)
P.E. Turbo and other stuff that gives 234BHP  \";)\"

Quote from: \"Wabbitkilla\"Mine is a bit stiff when cold, but once it\'s warmed up it slips in nicely.

VVT-i

#5
July 7, 2009, 21:20 Last Edit: January 1, 1970, 01:00 by Guest
Re-test day was today..................... Passed this time  s:) :) s:)
2005 MR2 Roadster  (Black)
P.E. Turbo and other stuff that gives 234BHP  \";)\"

Quote from: \"Wabbitkilla\"Mine is a bit stiff when cold, but once it\'s warmed up it slips in nicely.

Kool PT

#6
July 8, 2009, 09:36 Last Edit: January 1, 1970, 01:00 by Guest
nice one!

mine has its retest today once they've replaced both manifold sensors...fingers crossed as I leave for france this evening and driving to edinburgh will be hard without a car
PT\'s Cruiser: Black 2000 MR2 Roadster V6

3.0L 1MZ-FE V6, Ferrari 355 exhaust, Cusco FSTB, Tein S.Tech springs.

VVT-i

#7
July 21, 2009, 20:52 Last Edit: January 1, 1970, 01:00 by Guest
My woes  have returned  s:( :( s:(

I have swapped over the O2 sensors, swapped the MAF with the one from the wifes car (wife has no CEL, so maf is fine) I have changed most of the vac hoses in an attempt to rule out a leak... but still got the same problem of the car running to lean.

So today I took the car to a local jap specialist (Hypertech in Bonnybridge) who have a very good reputation,(  m http://www.hypertechscotland.co.uk/ m ) the guy there has had a quick look at it on the rollers, he was going to do a couple of gentle runs to check the AFR's and then do a power run, but he isn't at all happy with the AFR's so no power run for the time being. I have left the car with him so he can check it again in the morning when the engine is cold.. but the car is running way too lean on anything other than light to moderate throttle, it starts off ok then quickly leans out.  I may need to have it re-mapped.

Tomorrow I will pop up with the emanage software... yes I know, if he doesn't have the software I shouldn't let him map it, but he wants it to check things over so he can get a better Idea of exactly what's going on, then in a few days he has someone who can map the emanage coming in and will get him to look at my car, it could be a simple tweek or a full re-map. He knows the guys down at Nobles but says on this occasion something isn't right with it, as soon as I get more of whats happening I'll post up with it.


Just glad I haven't tracked the car or pushed it really hard, I've only had the odd burst of throttle so the wife can tell me to behave   s:lol: :lol: s:lol:  , which hasn't been long enough for me to notice the AFR's leaning out.
2005 MR2 Roadster  (Black)
P.E. Turbo and other stuff that gives 234BHP  \";)\"

Quote from: \"Wabbitkilla\"Mine is a bit stiff when cold, but once it\'s warmed up it slips in nicely.

VVT-i

#8
July 24, 2009, 13:30 Last Edit: January 1, 1970, 01:00 by Guest
Looks like I need a new Inlet Manifold as mine has a hairline crack, I also need a re-map or a tweek, any Ideas of the best place to buy the inlet manifold.. been quoted £270 from Mr. T   s:shock: :shock: s:shock:
2005 MR2 Roadster  (Black)
P.E. Turbo and other stuff that gives 234BHP  \";)\"

Quote from: \"Wabbitkilla\"Mine is a bit stiff when cold, but once it\'s warmed up it slips in nicely.

markiii

#9
July 24, 2009, 13:36 Last Edit: January 1, 1970, 01:00 by Guest
I was hoping I;d have one from my recent donor engine but alas it was fubared in shipping, speak to dyno evo, he may have one knocking around from his old pre v6 swap engine
Gallardo Spyder<br />Ex Midnight Blue 911 T4S<br />EX VXR220<br />Ex Custom Turbo 2001 Sahara Sun MR2 Roadster 269bp, 240lbft<br /><br />MR2ROC Committee 2002 - 2009<br /><br />

VVT-i

#10
July 24, 2009, 14:38 Last Edit: January 1, 1970, 01:00 by Guest
2005 MR2 Roadster  (Black)
P.E. Turbo and other stuff that gives 234BHP  \";)\"

Quote from: \"Wabbitkilla\"Mine is a bit stiff when cold, but once it\'s warmed up it slips in nicely.

Wabbitkilla

#11
July 24, 2009, 14:41 Last Edit: January 1, 1970, 01:00 by Guest
That's what i paid for my spare!
Cute & fluffy animals were definitely hurt during the production of this post, there're plenty more where they came from
Aztec Bronze S2 Elise 111S
Campovolo Grey Abarth 595 Competizione

markiii

#12
July 24, 2009, 14:59 Last Edit: January 1, 1970, 01:00 by Guest
bargain, I sold my last one for double that
Gallardo Spyder<br />Ex Midnight Blue 911 T4S<br />EX VXR220<br />Ex Custom Turbo 2001 Sahara Sun MR2 Roadster 269bp, 240lbft<br /><br />MR2ROC Committee 2002 - 2009<br /><br />

VVT-i

#13
July 24, 2009, 15:03 Last Edit: January 1, 1970, 01:00 by Guest
A spare?????... now you tell me!!   s:wink: :wink: s:wink:  

Went ahead and bought the ebay one, fingers crossed all is good with it.
2005 MR2 Roadster  (Black)
P.E. Turbo and other stuff that gives 234BHP  \";)\"

Quote from: \"Wabbitkilla\"Mine is a bit stiff when cold, but once it\'s warmed up it slips in nicely.
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