Failed Mot Exhaust Emission. Can anyone exlplain the following result please.

Oct 28, 2006 1 Replies
J

I have a Toyota Carina E (petrol, 1995). It failed the MOT's emission test. The results are listed below and would like your expert opinion as to what do you think is wrong.


200k Miles on the clock, runs perfectly well. Good mpg. The expensive lambda sensor is 3 yrs old. Engine type 4A-FE. The cat was hot when tested. No engine check light flashing on the dashboard. Slight vibration on the wheel at 70 MPH.

What if i just take the air filter element out for the emission test? It worked for my D reg Micra EVERY time. Anyony tried it with these morden ECU cars ?



Thank you in advance.


Oil temp >= 60 C cooling fan cut in



Fast idle Test: FAIL



Engine Speed 2350-2650 Rpm 2400 Rpm Pass CO:


Vote
Twitter Facebook LinkedIn
R

High carbon monoxide (CO) comes from an incorrect air/fuel mixture. Removing the air filter should not affect the result in a modern fuel injected engine because the air flow sensor is after the air filter element.

High CO can come from over-advanced ignition timing, leaking fuel injectors, a bad MAF sensor, PCV, evaporative emissions system problem, or bad oxygen (lambda) sensor.

Since the car seems to be running well, I would start by checking lambda sensor voltage and MAF voltage and compare with factory spec.

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required