#1: failed mot Author: omega, Location: nottinghamPosted: Mon Dec 01, 2014 1:49 pm ---- my 1.4 petrol as failed on the emissions but only on idle.
I have now changed the plugs.air filter.oil and filter anything else I can do?
oh yes 6 months ago had a new cat and exhaust as well
#2: Re: failed mot Author: richpowell91, Location: Melton Mowbray LeicestershirePosted: Mon Dec 01, 2014 1:51 pm ---- What reading has it failed on?
#3: Re: failed mot Author: omega, Location: nottinghamPosted: Mon Dec 01, 2014 3:32 pm ---- richpowell91
carbon monoxide content at idle excessive
carbon monoxide content after 2nd idle excessive
hydrocarbon content after 2nd fast idle excessive
and
exhaust emissions lambda reading after 2nd fast idle outside limits
ceers
#4: Re: failed mot Author: kandlbarrett, Location: SwindonPosted: Mon Dec 01, 2014 7:38 pm ---- Check for exhaust leaks. Scrunch up a rag and hold it over the end of the exhaust. While doing that get a mate to check under the car and under the bonnet listening carefully for leaks or damp (water) at a joint.
As well as being caused by a small exhaust leak it could be cheap cat not working correctly. It could also be lambda sensor beginning to fail or injectors not working correctly.
#5: Re: failed mot Author: Seatock789, Location: MorecambePosted: Tue Dec 02, 2014 8:38 am ---- Stick some redex in it and take it for a good run before re-testing it.
#6: Re: failed mot Author: kandlbarrett, Location: SwindonPosted: Wed Dec 03, 2014 10:33 am ---- Just looked again at this post. With both high HC and CO I suspect even more strongly exhaust leak causing the car to run rich (inject excess fuel.)
Start with checking exhaust for leaks and report back.
#7: Re: failed mot Author: omega, Location: nottinghamPosted: Fri Dec 05, 2014 3:56 pm ----
kandlbarrett wrote:
Check for exhaust leaks. Scrunch up a rag and hold it over the end of the exhaust. While doing that get a mate to check under the car and under the bonnet listening carefully for leaks or damp (water) at a joint.
As well as being caused by a small exhaust leak it could be cheap cat not working correctly. It could also be lambda sensor beginning to fail or injectors not working correctly.
you win the prize
exhaust wasn't leakin.but the new[cheap]cat had failed a new cat and she passed.
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