2000 honda integra 1.8vtec high 3% CO emissions and 16lp100km fuel consumption

amschip

I need help!!!!!
I have 2000 honda integra 1.8 vtec and my fuel consumption is on average about 16 liters per 100km also the car failed nct for incredibly high co emmisions. I've seen people reporting 0.5 to 0.8 byt mine is almost 3!!
Anyone can shed some light.
Here are my NCT results.

Low Idle (820 rpm): CO 0.13%vol max allowed 0.5
HC 0 ppm max 0 ppm

High Idle (3100 rpm): CO 2.83%vol max allowed 0.30
HC 161 ppm max 200
lambda 0.912 allowed 0.97 to 1.03

JHMEG

A sensor or the catalytic converter. You need to bring it to a garage. No-one can fix it here.

Cosmo K

The car passed the low idle test, its actually well below the limit, so I don't think the converter is gone.

Your results show that the engine is running very rich on high idle. Most likely air flow sensor, temperature sensor or lambda sensor. Don't let the garage to replace the cat before they have fixed the fault and got the lamdba value to very close to 1.000.

I had a emission hell and 6 retests recently on another car where the emissions first were a little bit out (less than 0.44 percent CO at high idle) and lambda towards the high limit. Garage first changed the cat, then a MAP sensor, then the lambda sensor and then the cat second time after which it finally passed with excellent emissions (0.05 CO).

The car passed in the garage after the first cat was changed but the real problem was the MAP sensor which kept fuel mixture too lean. This subsequently probably killed the 1st replacement cat between the work done and the 1st retest.

A normally working engine has emissions of about 1 percent of CO and 150 ppm of HC without a cat when the lambda value is 1.0. Your results are much lower than that at idle so the cat probably is ok but some faulty sensor tricks the engine management to douche the engine with petrol when under load conditions.

To recap: * DO NOT CHANGE THE CAT FIRST * You need to get the lambda down to 1.000 and then change the cat if CO is still high.

PS. It could also be some fueling mod or aftermarket part. For example air flow meters are known to go bad if they get fouled by oil from free flow airfilter.

Gumbo

lambda sensor is common to go on the Integra vtec's.

ddarraghh

low idle speed of 850 rpm thats not right
was the engine warm?
i have a 96 civic with 200000miles on the clock and emissiona are not a problem

amschip

ddarraghh wrote: »

low idle speed of 850 rpm thats not right
was the engine warm?
i have a 96 civic with 200000miles on the clock and emissiona are not a problem

See here
http://img20.imageshack.us/i/nctx.jpg/
I think it was as they usually do emission tests after about 5min

amschip

samih wrote: »

Your results show that the engine is running very rich on high idle. Most likely air flow sensor, temperature sensor or lambda sensor. Don't let the garage to replace the cat before they have fixed the fault and got the lamdba value to very close to 1.000.

I had a emission hell and 6 retests recently on another car where the emissions first were a little bit out (less than 0.44 percent CO at high idle) and lambda towards the high limit. Garage first changed the cat, then a MAP sensor, then the lambda sensor and then the cat second time after which it finally passed with excellent emissions (0.05 CO).

The car passed in the garage after the first cat was changed but the real problem was the MAP sensor which kept fuel mixture too lean. This subsequently probably killed the 1st replacement cat between the work done and the 1st retest.

A normally working engine has emissions of about 1 percent of CO and 150 ppm of HC without a cat when the lambda value is 1.0. Your results are much lower than that at idle so the cat probably is ok but some faulty sensor tricks the engine management to douche the engine with petrol when under load conditions.

To recap: * DO NOT CHANGE THE CAT FIRST * You need to get the lambda down to 1.000 and then change the cat if CO is still high.

PS. It could also be some fueling mod or aftermarket part. For example air flow meters are known to go bad if they get fouled by oil from free flow airfilter.

Thanks for the info. I cannot change cat atm as it seems that I have some aftermarket exhaust system and my garage couldn't find matching cat for me. As for the aftermarket mods i was thinking along the same lines as that would explain my huge fuel consumption. My car is 4 door sedan not type r and still has a huge kick. I have to check the air filter but I think its a stock one. I'll upload some pictures later on.
Cheers again.

P.S. There is one other thing. I got my hands on Acura Integra service manual and all models are fitted with 2 lambda sensor one before and one after cat but my mechanic says I have only one before. Might that be another reason?

JHMEG

amschip wrote: »

P.S. There is one other thing. I got my hands on Acura Integra service manual and all models are fitted with 2 lambda sensor one before and one after cat but my mechanic says I have only one before. Might that be another reason?

Depends on the year. Most Japanese imports in this country would pre-date the emissions regulations that required a lambda sensor after the cat. Dunno about a 2000 model tho. It boils down to when the legislation changed in Japan. I think it's been in place in the US since 1996.

amschip

JHMEG wrote: »

Depends on the year. Most Japanese imports in this country would pre-date the emissions regulations that required a lambda sensor after the cat. Dunno about a 2000 model tho. It boils down to when the legislation changed in Japan. I think it's been in place in the US since 1996.

Good to know, but my question still remains. Would that affect fuel injection if ecu lacks second lambda readings?
I'll do some diggings anyway maybe find a jdm manual.

ddarraghh

sounds like you car has been modified to make it noiser,use more petrol and loose power,
you need to get it to a mechanic

JHMEG

amschip wrote: »

Good to know, but my question still remains. Would that affect fuel injection if ecu lacks second lambda readings?
I'll do some diggings anyway maybe find a jdm manual.

2nd sensor, if present, is to make sure the cat is working. JDM manual will be in Japanese.

amschip

Hi all
Just to update you on the status of my issue.
I replaced lambda sensor for a new obx one from acura integra. After initial issues with ecu registration ecu accepted new sensor and after that the emission test showed everything way within the limits.
Thanks everyone for their contributions
I'm now checking fuel consumption and so far went from 250km/40l tank to 310km (that was half a tank before and half a tank after sensor replacement)

PaddyFagan

amschip wrote: »

I'm now checking fuel consumption and so far went from 250km/40l tank to 310km (that was half a tank before and half a tank after sensor replacement)

That should mean you get roughly 400km from a tank - which is still 10 l/100km which seems a bit high to me (28 MPG). But I'd know nothing about what you should be getting....

Paddy

Atomic Pineapple

PaddyFagan wrote: »

That should mean you get roughly 400km from a tank - which is still 10 l/100km which seems a bit high to me (28 MPG). But I'd know nothing about what you should be getting....

Paddy

28mpg is a bit poor on a non type R four door sedan.

I get 25mpg with mixed hard/normal driving and can get up to 30mpg if I drive like a granny