Has anyone any suggestions on what to do on how to pass emissions with an S50 w/ cams. I am looking to anyone who has had an experience with not passing emissions test after installing cams. i'm not sure what to do. I have spent all this money and now I'm being told that there is nothing that can be done. :mad

I refuse to believe that there is nothing that can be done. Just looking for ideas.

Thanks for any help anyone can provide. :help

How is the car failing the emissions test? High HC, CO or NOx?

Sorry, should have said this before. High HC. 220 is the legal limit, but the car is putting out 576.

It would seem to me that HC that high would be any or a combination of:

1) Bad or undersized catalytic converters
2) Oversized injectors or excessive fuel pressure
3) Bad pre-cat O2 sensor or disabled mixture control feedback
4) Tuning S/W

The cams would be a factor since they change the mass flow characteristics of the engine, But it would seem to me that proper sizing of all components and correct tuning (for street use) would result in much lower HC values, hopefully below the limit.

Ok, thanks for the info. Maybe I can explain some of the things you listed.

1. Bad Cats- Possible, seeing how they are still the original.
2. The injectors are 24#
3. As far as I know there is only 1 O2 sensor on 95's, correct? I may be wrong. If you could please advise if there are supposted to be more than the 1.
4. The tune may be to aggressive. The owner of the shop that installed the cams said that he gave more timing to them to give me alittle more power.

A combination of all these factors could very well be what is causing this mess. Let me know if you can help anymore with some of these points.

Matt

You are correct in that you ony have a single O2 sensor. In general you can figure on the useful life of an O2 sensor as being no more than 100k. By that point the sensor has aged enough for the age induced enrichment to have become significant. If that applies in your case a new O2 sensor should help.

I don't know if your mods demand the use of 24lb injectors or whether you could get away with 19lb injectors. Nor do I know whether your tuning S/W is properly set up for your configuration. If the software is right and the DME can use a narrow enough injector pulse at idle, those injectors should be okay. But if the DME is using the minmum possible pulse width and the injectors are flowing too much, a lower rated injector would be necessary to get the idle HC down.

As alluded to above, by tune I'm talking about the DME's tuning maps. If everything else is correct, having a tuner fiddle the maps would probably help. And as I mentioned earlier, the DME data must match the engine's configuration.