NCT help

Sesshoumaru

I have 1992 MR2 GTS Turbo and my NCT certificate expires December 31st. I have a small problem with emissions, in that they are way off! I had my mechanic do an emissions test and its quite terrible. It seems the previous owner had the catalytic converter removed and the lambda sensor that is normally connected after the cat has nowhere to plug in(aftermarket exhaust). So I was hoping it might be possible to plug a hole in the exhaust and attach the lambda sensor. But I have no clue where I could get this done? Does anyone have any recommendations on where I might get this done?

Tanabe

Don't know if this will be any good to you but a lad I know had a CTR failing on emissions & he had to change the ecu on her to one from a standard Civic. It had an upgraded ecu in her when she came in from Japan but since he changed it the car has since passed with flying colours.:)

Maybe you'll have to fork out on a new exhaust (with a cat)

ciarsd

I think the easier thing to do is to source a standard exhaust system for your car, including the CAT, and get it fitted for the NCT.

Drilling into your aftermarket system (still without a CAT) is still leaving you open to failure and a ruined aftermarket system..

Without a CAT fitted, I'm 95% sure that you are going to fail every emissions test - particularly with a Jap imported turbo car

Sesshoumaru

I've found a mechanic who will weld in a plug for my oxygen sensor and is sourceing a cat for the car. Hopefully she will pass the test once this is done. Are the emission standards quite strict in this country?

Tanabe

ciarsd wrote:

Without a CAT fitted, I'm 95% sure that you are going to fail every emissions test - particularly with a Jap imported turbo car

Don't know about that.....I've heard of plenty that have passed without a cat

@ Sesshoumaru:

Let me know how you get on with NCT;)

layke

Mates of mine have passed without a CAT in their cars and trust me they are heavily modified cars.

The emmissions tollerance level is very high, but from what I gather about the NCT it really depends on who you get on the day. They are not the most consistant of tests.

Good luck with the test.

Sesshoumaru

Did these guys who passed without cats have aftermarket ECU's? My first idea for passing the emissions test was to buy an Apexi replacement ECU for the car. A bit pricey, but I figured I could have a seperate mapping that leaned off the air/fuel mixture just for passing the NCT.

Is it not a requirement to have a catalytic converter fitted for the test? or is it they only care about what comes out of your tailpipe?

Tanabe

Sesshoumaru wrote:

Is it not a requirement to have a catalytic converter fitted for the test? or is it they only care about what comes out of your tailpipe?

Yes it IS a requirement to have a cat for the test!!

And yes they DO only care about what comes out of the tailpipe. (If you know what I mean):D

galwaytt

Tanabe wrote:

Yes it IS a requirement to have a cat for the test!!

And yes they DO only care about what comes out of the tailpipe. (If you know what I mean):D

No it's not. It's only required from a certain age (I don't know which, at the mo..).

I've a '90 MX-5 Jap import with no cat, and it has sailed through 3 NCT's so far. And it's still on the same plugs I bought the car with !

Seth Brundle

IIRC cars sold after Jan 1st 1992 must by law have a cat!

Sesshoumaru

Well I have no cat and my car passed the emissions test no problem. I did fail on the handbrake as the passenger side cable snapped. I've since replaced both cables and only have to go back for the handbrake test. Happy days

Seth Brundle

Sesshoumaru wrote:

Well I have no cat and my car passed the emissions test no problem.

What year is your car?

Sesshoumaru

kbannon wrote:

What year is your car?

1992

greglo23

Reasons for Failure

Engine Exhaust System (1) Leaking

Emission Control System (2) Emission control system leaking, incomplete or incorrectly assembled.

Idle Speed (3) Obviously outside vehicle manufacturers recommendations (e.g. ± 100
R.P.M. of manufacturers stated speed).

Carbon Monoxide (4) For vehicles first registered before 1st day of October, 1986, the carbon
Emission monoxide content is more than 4.5% at idling speed.

(5) For vehicles first registered on or after 1st day of October, 1986, up to
31st December, 1993, the carbon monoxide content at idling speed is
more than 3.5%.

(6) For vehicles first registered on or after 1st day of January, 1994, the
carbon monoxide content at idling speed is more than 0.5%.

(7) For vehicles first registered on or after 1st day of January, 1994, the
carbon monoxide content at 2,500 R.P.M. or at a speed specified by the
vehicle manufacturer is more than 0.3%.

(8) For vehicles first registered on or after 1st day of July 2002 the carbon
monoxide ad idling speed is more than 0.3%.

(9) For vehicles first registered on or after 1st day of July 2002 the carbon
monoxide at 2500 R.P.M. or at a speed specified by the vehicle
manufacturer is more than 0.2%. Hydrocarbon (H.C.)

(10) For vehicles first registered before 1st October, 1986, the hydrocarbon
content at idling speed is more than 1,000 P.P.M.

(11) For vehicles first registered on or after 1st day of October,1986, up to
31st December, 1993, the hydrocarbon content at idling speed is more
than 750 P.P.M.

(12) For vehicles first registered on or after 1st day of January, 1994, the
hydrocarbon content at 2,500 R.P.M. or at a speed specified by the
vehicle manufacturer is more than 200 P.P.M. Lambda

(13) For vehicles first registered on or after 1st day of January, 1994, the
lambda value at 2,500 R.P.M. or at the speed specified by the vehicle
manufacturer is not 1± .03 or within the vehicle manufacturers
recommendation.

Exhaust Emissions (14) Excessive exhaust smoke likely to affect other road users.

Tanabe

Sesshoumaru wrote:

Well I have no cat and my car passed the emissions test no problem. I did fail on the handbrake as the passenger side cable snapped. I've since replaced both cables and only have to go back for the handbrake test. Happy days

Glad to hear the good news;)

Did you just get a mechanic to weld in a plug for the oxygen sensor & away you go?

Sesshoumaru

Tanabe wrote:

Glad to hear the good news;)

Did you just get a mechanic to weld in a plug for the oxygen sensor & away you go?

No the second oxygen sensor still wasn't connected. I just left it as it is. It still has the first oxygen sensor connected in the exhaust manifold. But thats it. I just ran it through the NCT to see would any other problems crop up before I start fixing stuff.

Tanabe

Nice 1;)

mmenarry

kbannon wrote:

IIRC cars sold after Jan 1st 1992 must by law have a cat!

Close, 2 years out. 1st Jan 1994 onwards (type approval regulations)

M.