High Emissions

Galwayclass

Just failed NCT on emissions........................
Engine/Oil Temp 87c
Low Idle (800rpm) CO 6.07%
HC 295ppm

High Idle (2890rpm) CO 3.87%
HC 200ppm

Lambda 0.90

Think I might need a cat but could anything else be the reason for the high readings.

Thanks

biko

General help here
http://type2.com/s/?tag=exhaust

cb900ie

What car, year, engine etc.?

Galwayclass

2000 Hyundai Trajet 2l petrol

cb900ie

These readings indicate that the engine is running on a very rich mixture so I assume the fuel consumption is high? There are a number of causes for this. First, has the car been fully serviced recently?

Galwayclass

Only bought it a week ago.It was lying up since last July.Am getting it serviced this week.Yea its very heavy on juice.

Midnight_EG

02 sensor and cat would be the first things to check anyway!

Drake66

I got a Trajet through NCT a little while ago. Engine Warning light was on and emissions were too high prior to the test. The mechanic put a fuel treatment into the tank and revved it red hot. The emissions started coming down and the engine management light went off.

cb900ie

Galwayclass wrote: »

Only bought it a week ago.It was lying up since last July.Am getting it serviced this week.Yea its very heavy on juice.

A full service is definitely the first move. If the car was being started occasionally during that period and not driven, the oil will be contaminated with unburnt fuel, which will cause high emission readings. If the air filter is dirty or the spark plugs worn, either will cause this too. Is there any misfire from the engine e.g. stuttering when driving?

Galwayclass

No its driving fine and there are no warning lights coming on.Brought it to a Hyundai garage they dont have a way of testing the emissions but he feels its needs two sensors and they are 150 each.
I had a small oil leak so I put in a can of Wynnes Oil Leak Stop would this have had a difference,I put it in two days beforehand.
The car is auto if that makes any difference

cb900ie

Possible but I doubt it as your fuel consumption is poor anyway. If the service does not improve the situation, it could be a faulty coolant temperature sensor for the engine management providing an incorrect signal, resulting in excess fuel injection. Still a good idea to eliminate the service components first. What mileage is on the car, and what sensors did the Hyundai garage recommend?

biko

www.galwaycarservicecentre.ie
I have mixed experiences with them but they do get a lot of NCT stuff being just across it.

Galwayclass

He said I needed a O2 sensor and another sensor cant think,he said both were at either side going into the cat.
The mileage is fairly low at 128k km, it was a jap import.

cb900ie

There are two oxygen sensors, one before the cat and one after. If they are the original sensors, they may indeed need to be replaced as they are aged. However, a lot depends of the fault codes that the garage found and how they interpreted them. For example, a front oxygen fault code would be expected with your level of emissions, but it doesn't necessarily mean that the sensor is faulty. A rear oxygen fault code could also be expected if the cat can't cope with the high emissions or if the cat is faulty. Again, the sensor may not be faulty. Nothing to be lost by eliminating the service possibilities first.

DublinDilbert

Galwayclass wrote: »

Brought it to a Hyundai garage they dont have a way of testing the emissions but he feels its needs two sensors and they are 150 each.

You'd be best bringing it somewhere that can actually test the emissions so you know the problem has been diagnosed and fixed correctly.

Its unlikely that both sensors are gone, the rear sensor is there to measure the CAT efficiency, so if the rear sensor is faulty a warning light will come on but it won't effect the actual emissions.

Galwayclass

cb900ie wrote: »

There are two oxygen sensors, one before the cat and one after. If they are the original sensors, they may indeed need to be replaced as they are aged. However, a lot depends of the fault codes that the garage found and how they interpreted them. For example, a front oxygen fault code would be expected with your level of emissions, but it doesn't necessarily mean that the sensor is faulty. A rear oxygen fault code could also be expected if the cat can't cope with the high emissions or if the cat is faulty. Again, the sensor may not be faulty. Nothing to be lost by eliminating the service possibilities first.

Thanks for the advice.Will get it serviced and see how I get on.The guy at the garage said there should be warning lights on if there was problems with the sensors or the Cat.Hopefully a full service should sort things out.
Get them to do a diagnostic test and a full service and see how I go from there I suppose.
Thanks again.

Galwayclass

DublinDilbert wrote: »

You'd be best bringing it somewhere that can actually test the emissions so you know the problem has been diagnosed and fixed correctly.

Its unlikely that both sensors are gone, the rear sensor is there to measure the CAT efficiency, so if the rear sensor is faulty a warning light will come on but it won't effect the actual emissions.

Been qouted 90 euro and will be without the car for two days for a service centre with an emissions machine to carry out a diagnostic test on it.Does this sound right.

cb900ie

Galwayclass wrote: »

Thanks for the advice.Will get it serviced and see how I get on.The guy at the garage said there should be warning lights on if there was problems with the sensors or the Cat.Hopefully a full service should sort things out.
Get them to do a diagnostic test and a full service and see how I go from there I suppose.
Thanks again.

No problem. Post an update when you have news.

DublinDilbert

Galwayclass wrote: »

Been qouted 90 euro and will be without the car for two days for a service centre with an emissions machine to carry out a diagnostic test on it.Does this sound right.

It might be good value, depending on what they do. If they are experts and tell you exactly what is wrong then that would be grand. If they take the car for 2 days and come back with "it could be this...." or "you should try this...", then its not good value. Being without a car for 2 days is a bit mad.

If you post your general location, some of the guys on here should be able to direct you to someone who can test/diagnose/fix your problem.

Galwayclass

DublinDilbert wrote: »

It might be good value, depending on what they do. If they are experts and tell you exactly what is wrong then that would be grand. If they take the car for 2 days and come back with "it could be this...." or "you should try this...", then its not good value. Being without a car for 2 days is a bit mad.

If you post your general location, some of the guys on here should be able to direct you to someone who can test/diagnose/fix your problem.

As the name suggests I live in Galway.Car flew through on everything else.A right pain.