With a cool engine it would be more likely to show rich running. CO and HC are low and Lambda is also showing weak mixture. Have you checked for any exhaust leaks between the cat to the tail pipe?

 

Hi ,
Thanks for the input - I've practically checked everything but I must admit that I haven't done a full check for leakage yet need to go to a garage with a proper lift....
BR
HåkanW

 

Hi again,

Still failing - confusing results though

CO 0,9 HC 055
C02500 4,5 LAMBDA 1,42

The figures comes from the test report, but the guy doing the test said most values where fluctuating in a mannner he never seen before

Only thing done is replaced spark plugs and fixed a potential leakage of air after the filter...

No leakage found on the exhaust....


I must say that the most amazing thing is tghat the car actully is working very well. No indications of problems when using/driving the car.

Any ideas? Could it be "bad" fuel or something?

BR
HåkanW

 

I should have expected the weak running shown on the original results to be fixed when the intake leak was found. What, and exactly where was the leak?
Confusingly the CO is now showing rich running especially on the fast idle and a very weak mixture on Lambda to the extent that there must be doubt about it's accuracy.
It may be that the rich mixture is due to a faulty Lambda sensor and that on the original readings it was compensated for, by the intake air leak.
Not very helpful I'm afraid!

 

Hi,

The leak was where the filter-box connects to a "outgoing" hose - the clamp was loose and the hose had "slipped" an inch and it was an obvious leak...

I'll check the lambda-sond - should be rather easy to measure.

BR
HåkanW

 

Did you manage to resolve this problem?

 

Hi,

Sorry for not replying...fell off a roof and injured my back and haven't been able to work on this until now...

tried replacing the Lambda (both) with little or no improvment, CO is better but still lambda is to high.

Maybe the cat? Expensive as I haven't seen any "aftermarket" pieces...

/HåkanW

 

Cancelled.

 

Hi,

Problem solved.... It was the lambda - after replacing and testing everything was OK, but we we're fooled by a faulty test equipment. Going to another garage doing the test everything was OK.

Roby37 : Your analysis was correct - fixing the air leakage revealed the real problem with the lambda - Thanks!

BR
HåkanW

 

Thanks for the feedback, I hope your back is fixed as well, I bought a bungalow, not so far to fall