pete8v
Member
Registered: 25th Jan 12
Location: grimsby
User status: Offline
|
took my car for mot today and failed on emissions its a c14nz with mods are pipercross cone filter sportex middle section and peco 5x4 oval backbox. its saying lambda sensor fail but its functioning fone as its brand new no eml on the dash no codes stored in ecu. the mot tester said it could be due to the large bore on the back box as their are no leaks in the exhaust system. i have fitted my standard back box on to see if it makes a difference but i thought i would ask you guys for advice thanks p.s sorry about the long essay
[Edited on 06-11-2012 by pete8v]
|
tom130691
Premium Member
Registered: 13th Sep 08
Location: Daventry
User status: Offline
|
will need a new cat the big back box wont make a difference to what comes out of the engine
what reading did it fail on?
|
pete8v
Member
Registered: 25th Jan 12
Location: grimsby
User status: Offline
|
lambda reading was 1.041 and its a newish cat and new lambda sensor they said it could be due to lesser restriction in the exhaust making it pull in more oxygen ?
|
pete8v
Member
Registered: 25th Jan 12
Location: grimsby
User status: Offline
|
Sometimes removing a restiction from the exhaust interferes with scavanging and draws to much oxygen threw the exuast thats what a mate has just said
|
Corsa_Sport21
Member
Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
User status: Offline
|
Max lambda reading is 1.03 is it not?? If so, then your not that far off.
Stick some Optimax or another high octane pump fuel in, some Redex fuel system cleaner, and take it for a good spanking before MOT. Should bring it down quite a bit. Have done that more times than i can remember and it works a treat.
|
tom130691
Premium Member
Registered: 13th Sep 08
Location: Daventry
User status: Offline
|
tell him to stick the test further up the exhaust then away from the oxygen 
|
pete8v
Member
Registered: 25th Jan 12
Location: grimsby
User status: Offline
|
thanks will try that
|
Jamie-C
Member
Registered: 3rd Jun 08
Location: Ballycastle
User status: Offline
|
Give her a good blast down the motorway before MOT and get it red hot
|
pete8v
Member
Registered: 25th Jan 12
Location: grimsby
User status: Offline
|
got it through got them to wrap the probe in a rag and it brought it down to 1.001
|
Darryl H
Organiser: South Central
Premium Member
Registered: 19th Nov 09
Location: Camberley Drives: Porsche 944
User status: Offline
|
quote:
Originally posted by Jamie-C
Give her a good blast down the motorway before MOT and get it red hot
This would have been the best way to get it down 
[Edited on 07-11-2012 by Darryl H]
|My Corsa|SC|My Instagram|
|
swill_omnibus
Member
Registered: 12th Dec 07
Location: : S. wales Drives: Dodge Caliber
User status: Offline
|
Redex fuel treatment, let the revs get high for a while to get all the carbon broken up and out of the system.
|
