bulldog24

I took my 951 in to get the inspection sticker this weekend and the guy at the shop told me that my HC and CO levels came back too high for him to issue my sticker. He siad they weren't off the charts over and suggested an additive that could get them back down in the 15 days I have to get it done again (or I'll have to pay for it again). Anybody know of any quick DIY fixes for the emission levels????

V2Rocket

play with the FQS (position 2) and pull some fuel.

dme

too rich. How old is the o2 sensor? Make sure the engine is good and hot when you go in.

bulldog24

I've got the service records back to the day she was bought at the dealership and I don't see anything on the O2 sensor. Could replacing that fix it?

V2Rocket

um, if you have the original o2 sensor it is definitely time to replace that thing. takes like 10 minutes at the most half of which is spent figuring how to use a vise to open a beer bottle

bulldog24

Great, I'll try that and the fuel additive the mechanic gave me. Thanks!!

944Ross

Also see a thread posted by Kuhl951 on same subject.

KuHL 951

The first thing I would suggest is fresh oil, clean plugs, and a strong load of good fuel injector cleaner before any test. Unless you like to replace parts without proper testing you can spend a lot of money trying to bring HC and CO down by replacing O2's and cats, BTDT. Don't mess with the FQS settings unless you have them set non-OE for a chip set or have a method to quantify the changes. If you have an aftermarket chip go back to stock or borrow one. Make sure there are no vac leaks and the AFM flapper door is closing all the way. Does it smell rich when you start it cold or spit black specs out the tailpipe in the morning? Does Texas measure NOx as part of the test, if not xylene added to the fuel at 15% will help HC and CO levels a lot but it can raise NOx? Last but not least drive the **** out it right before the test to get the cat so hot you could cook a chicken on it. In the end it's always better to just have a well tuned car than try to trick the system IMO.

944Ross

Yeow, I'd be reluctant to try 15% xylene! not to mention the cost! That's paint remover.

KuHL 951

I've used it many times on the 951 when I want to turn up the boost for a fun run with no ill effects. It made a 250K Jeep Cherokee of mine pass with flying colors. You don't need to treat an entire tank. For smog you only have to add enough to mix a 1/4 tank or less and then top off after if you aren't comfortable. The price of a failed emissions test ain't cheap either. Normal gas is already 25-30% aromatics (usually toulene or xylene) so I wouldn't sweat the 'paint remover'

V2Rocket

its only a paint remover for the guy tailgating you

bulldog24

Thanks for the help, i'll try your suggestions!

bulldog24

Texas does measure Nox as part of the test but my car was under by more than 50% of the standard on both the hi and lo RPM readings. Where would I pick up xylene and how little would get me by? My readings weren't too much higher than they were supposed to be my CO readings were 1.42 (standard 1.04) and 1.07 (std .94) and the HC readings were 214 (std 162) and 223 (std 167). They sold me RXP at the test station.

V2Rocket

xylene is available as "xylol" from paint supply stores or home depot

bulldog24

Went back today for my re-inspection that I can get without paying again. Ran a bottle of RXP through the tank and I failed again! This time the CO levels were higher than the first and the NOX level failed, my HC levels dropped to passing but I'm totally stumped. Now what???