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Big emissions failure. :(


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Just took my glanza for mot and all was fine except emissions.. On all tests the CO was about 6.5 - 7% and the lambda was 0.82.... Both fails, but HC passed (just - by 4ppm!!) any thoughts would be good :) I'm thinking boost leak, or too high fuel pressure or timing?! It's got fuel pump, fpr, cat was fitted, ct9 turbo, runs a little rich on low rpm and a bit lean on high rpm..

Had a lot of stress with the car recently, and was hoping it'd go we'll for a change! Not driven the car for a month and a half! :(

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Set the ignition timing to 10* BTDC


Set the fuel pressure to standard which iirc is 2.4bar (if you have an aftermarket FPR)

Check for any exhaust leaks

Check for drawing in air at inlet (this would normally give hunting / a high idle)

Replace the o2 sensor if you want

Take it for a good run, kick its cunt in and get the cat up to temp

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Yeah the CO is waaaay over, normally just overfuelling but there are hundreds of causes, few to check.



Fucked o2 sensor


Restricted air filter


Vac leaks to MAP sensor (car would barely run)


Fucked cat or not up to temp


Carbon canister fuel vapour system inop


Fuel / oil contaminated together


Or just not changing oil frequently


Thermostat stuck wide open



Thats concentrating on the CO related things.



Hope this helps somewhat buddy and keep us up to date with how you get on :)


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  • 4 weeks later...

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