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displaying posts 1 to 14 of 14
| Author | Subject: High CO |
 Tarmac terror
Regular  Location: Southampton Registered: 20 Mar 2014 Posts: 458 Status: Offline |
Post #1
Took the Rallye down for an MOT and it failed on both hydrocarbons and CO. OK, I thought, as I had fitted a 'stealth decat'. Took it home and chucked on the cat and drove it back.Still failed on CO  Now, it passed last year without much drama and I've not fiddled with much since. Tried looking at most things it could be but still at a loss. Thinking I might be missing the wood for the trees so to speak..... Any ideas? TT |
 Posted 19th Aug 2015 at 21:12
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rikky
🦔 Location: cheshire Registered: 28 Feb 2004 Posts: 26,793 Status: Offline |
Post #2
what are your readings?________________________________________ 306 rallye reproduction decals (full sets/individual decals) | 306 b-pillar textured vinyl weatherstrips306 slam panel esso stickers | 306 yellow / orange / pension fund red side door badges gti6 inlet manifold badges | 306 rear boot badges (p2/p3) winner of Extraction of toys from prams with outstanding vigour award 2009 [source: gti6 owners club] |
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Posted 19th Aug 2015 at 21:19
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MisterGTR
Senior User  Location: Glasgow Registered: 05 Aug 2014 Posts: 675 Status: Offline |
Post #3
Whatever you call the equivalent of a MAF on a 6! MAP?!________________________________________ Turned 40 and in true cliched fashion buying one of the cars of my teenage dreams! |
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Posted 19th Aug 2015 at 22:58
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craig903
Regular  Location: whitstable Registered: 08 Jul 2013 Posts: 273 Status: Offline |
Post #4
do you have any exhaust leaks? that can effect the readings.________________________________________ 208 GTI OwnerTurbo'd '6 project - work in progress |
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Posted 20th Aug 2015 at 00:06
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armzsc6
Seasoned Pro  Location: Crowborough Registered: 22 Mar 2008 Posts: 3,445 Status: Offline |
Post #5
CO is carbon monoxide it is what among other things the cat is there to burn off. If it failed on hydrocarbons too then that's a sign of incomplete combustion. Either it's overfueling so lambda sensor or green coolant sensor are faulty or there's another reason why it isn't burning all the fuel as it should. Unburned fuel in the exhaust damages the cat which will then cause the CO to be high. Were the lambda readings ok when the CO was out? And what was the CO reading it failed on? At fast idle only or at natural idle too.... ________________________________________ Black power baby! SUUUUUPERCHARGED Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p 12x 306's owned so far Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist. Pug planet / Citroen Lexia diagnostics / code reads available. |
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Posted 20th Aug 2015 at 07:58
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Tarmac terror
Regular Location: Southampton Registered: 20 Mar 2014 Posts: 458 Status: Offline |
Post #6
Right, I dug out the failure cert and the readings are thus (when decat was on!)Fast idle Test CO 8.43 !!!!! HC 372 Second Fast Idle CO 8.37 HC 410 Natural idle CO 1.24 So I went back and fitted cat and all he said was that the hydrocarbons were now in limits but CO was still 'way high'. TT |
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Posted 25th Aug 2015 at 16:27
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #7
yeah, a healthy engine/management system will be borderline pass even without a cat.so there's something making it throw more fuel in. ________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 25th Aug 2015 at 16:31
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Tarmac terror
Regular Location: Southampton Registered: 20 Mar 2014 Posts: 458 Status: Offline |
Post #8
See, that's the thing...Smells like it's running rich but as per my build thread I've had a bit of a power loss issue and have replaced all engine sensors as well as ECU in an attempt to sort it out. Wasn't the ECU and the one I replaced it with was of the same variety. Sensors didn't change over various years did they i.e. lambda, MAP?? Maybe my replacement ECU isn't compatible with a sensor? Sound plausible?? TT |
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Posted 25th Aug 2015 at 17:36
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welshpug!
Capt Pedantic Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #9
nope, all the sensors are the same resistance ranges, only plug style changed.get it on pp2000, compare given values with expected values. ________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 25th Aug 2015 at 17:50
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armzsc6
Seasoned Pro Location: Crowborough Registered: 22 Mar 2008 Posts: 3,445 Status: Offline |
Post #10
Yup something is out of spec most likely lambda though what quality did you replace it with? Cheap ones are useless if have gone for a Bosch all day long. As WP says get live data read it should show something's out. Put my 6 on a gas analyser many times while it was standard other than decat and it would pass on CO and hydrocarbons at idle would only go over on CO by a small amount on fast idle with no cat at all. ________________________________________ Black power baby! SUUUUUPERCHARGED Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p 12x 306's owned so far Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist. Pug planet / Citroen Lexia diagnostics / code reads available. |
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Posted 1st Sep 2015 at 13:18
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bigbadbowen
Seasoned Pro  Location: Winchester Registered: 21 Nov 2003 Posts: 13,752 Status: Offline |
Post #11
Need an oe cat on the thing and then get it red hot ! Should bring down the values |
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Posted 1st Sep 2015 at 13:47
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welshpug!
Capt Pedantic Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,817 Status: Offline |
Post #12
bigbadbowen wrote: Need an oe cat on the thing and then get it red hot ! Should bring down the values not a chance it'll bring it down that far. ________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 1st Sep 2015 at 14:27
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adam b
Seasoned Pro  Location: The Nam Registered: 24 Jan 2006 Posts: 12,828 Status: Offline |
Post #13
Not using an adjustable fuel reg are you? They can slip________________________________________ Nothing to see here |
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Posted 1st Sep 2015 at 17:36
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Tarmac terror
Regular Location: Southampton Registered: 20 Mar 2014 Posts: 458 Status: Offline |
Post #14
adam b wrote: Not using an adjustable fuel reg are you? They can slip Nope, std reg?? The lambda I bought was a genuine Bosch with the part number as taken from this site...0258003717 TT |
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Posted 9th Sep 2015 at 18:58
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