Exhaust emmissions

[Liam O'Flynn]

My 1994 Jap import Celica is having difficulty passing the NCT on emmissions,
a number of attempts to reduce the CO from 0.5% to 0.3% have failed.
Any assistance greatly appreciated.

[Junior]

What exactly have you done to reduce the emissions ?

I take you used something like some of those pre test additives ? Have you retarded the timing so it doesn't actually burn as much fuel ?

[WhipLash]

I've heard that using Shell Pura petrol for a few days before the test can help reduce emissions by a minimal amount. This may be of help if used in conjunction with other emission reducing methods.

[BeCos]

Retarding the timing wont reduce fuel consumption, in fact it will increase the amount of unburnt fuel, and you definitely dont want to do that.

A '94 Celica shouldn't have a problem passing the test unless its burning oil or the oxygen sensor isn't doing it job properly.

When did you last change the engine oil & filter, air filter etc. ?

Is the car modified at all ?

My guess is that it IS burning oil and that is being picked up. No real short/long term solution for that one, although cleaning out the breather system MIGHT help!

[Junior]

We slowed down everything on my brothers car when it went for the NCT .. although that was daysal

[BeCos]

Ahh yes, if it's diesel and you retard the pump timing it wont deliver as much fuel !

Doesn't work on a petrol motor though!

[Liam O'Flynn]

A Toyota main dealer replaced the oxygen sensor (they don't like Jap imports)
with one from a broken Lexus.......could this be my problem?

Car is in great nick so I don't think it is burning oil.

[BeCos]

Yes I'd say it IS your problem. Dont spend money anywhere else until you've got a new one of these!

Let us know!