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[barclay03]

mega was in for its MOT today and failed on its emissions - tester even asked if it still has is cat :lol:

i suspsected it to be out, but need advice on where to start looing, results were

Fast Idle Test

Speed                        3100/min
CO (0.3)                     5.68 %vol
HC (200)                    370 ppm
Lambda(0.97-1.03)      0.85

-------------------------
2nd Fast Idle Test

Speed                        2900 /min
CO (0.3)                     3.82 %vol
HC (200)                    318 ppm
Lambda(0.97-1.03)      0.89

------------------------
Natural Idle

Speed                        750 /min
CO (0.5)                     8.71 %vol


so it failed on every account....what dyou guys think? my exhaust has been getting louder, and seems to be rattling from around the passenger side cat - but ive checked it over and the fitment is solid, with no leaks anwhere in the system?! that particular cat has previous damage to it and has been welded up also..

just wondering where to start?... spark plugs are just fitted, and it was redex and run in few weeks ago (before new plugs). new lambda perhaps?

[Kevin Wood]

Yuk!

That's horrendous!

there's certainly nothing left of the cat, but if those figures are to be believed there's something else badly worng because it must be running pig rich.

First off, try reading the codes from the engine ECU and see if it is complaining about anything.

Kevin

[barclay03]

thanks kev, yea it seems really badly out doin my head in as ive had some people interested in buying it and dont want to put out too much cash!

ill have a check and see if codes flag anything up!

[Kevin Wood]

Yep. Check for codes first because I think the ECU should be complaining wit the emissions that bad. If that doesn't give you any leads, I'd suspect something like the coolant temperature sensor misreading. If this is always telling the ECU that the engine is cold, it will apply lots of enrichment (used to be called the Choke control;)).

Kevin

[barclay03]

tried the paperclip test and noticed management doesnt come on at all :? even on normal start up... i also noticed that its in a different position than the one in the how-to video...

[TheBoy]

tried the paperclip test and noticed management doesnt come on at all :? even on normal start up... i also noticed that its in a different position than the one in the how-to video...

pop dash off, check if bulb blown.  eml should come on with ignition

[barclay03]

just did it... bulb and holder has been removed, replaced with a new one... management light stayed on, just getting the codes just now...

[TheBoy]

just did it... bulb and holder has been removed, replaced with a new one... management light stayed on, just getting the codes just now...

A common sales trick to hide faults on car

[barclay03]

yup! coincidently in the owners manual was a print out from here with marks guide on taking instrument cluster out... so will work out if it as printed whilst previous owner had it (very well respected here for his work on cars too!).

fauls that came up...

73   Mass Air Flow Sensor Voltage Low
13   O2 Sensor 1 Open Circuit


that was on second try, on first try the coolant temp voltage code was also displayed

[TheBoy]

sort the 13, the maf one may disappear.

As the system cant go closed loop, the emissions are all over the shop.

May, if you're lucky, just be busted wire...

[barclay03]

yup, thats was my plan when i got MOT results, try lambda first, will have a poke around it tomorrow, see what i can see, and judge of new one(s) is neeed or not

[davlad22]

coincidently in the owners manual was a print out from here with marks guide on taking instrument cluster out... so will work out if it as printed whilst previous owner had it

That'll be the giveaway!!  

So, is O2 sensor '13' a lambda sensor in the exhaust?

[barclay03]

coincidently in the owners manual was a print out from here with marks guide on taking instrument cluster out... so will work out if it as printed whilst previous owner had it

That'll be the giveaway!!  

So, is O2 sensor '13' a lambda sensor in the exhaust?

yea, i didnt think twice of it because guy i got it from is well respected (and just checked the printed dates, and it was 5 months before he got it, so may have been owenr before him)

im assuming O2 sensor is lambda sensor - usually known them by both names... though i could be wrong lol

[davlad22]

Wonder if coolant temp sensor is dodgy also as suggested by Kev?

Hope you get it sussed mate  

[barclay03]

yea was thinking it might be, will see if it comes up again lol good call by kev if it is, and for the sake of a few quid (im guessing, as they usually are) ill replace it