Please Help - Car Failed Test

[BYprodriver]

By "Dansk Sport Exhaust" I think that means 100 cell converters & those will allow an increase in emissions. Have you passed smog test with these before?

Fresh Gas will help ( Chevron premium ) & new spark plugs help too.

Hydrocarbons are basicaly unburnt fuel so you need to increase your combustion effecentcy

[angman]

Thanks for the tips so far guys. I'll try driving the heck out of the car as well as look into the RXP if I can find it.

I have passed with zero problems with my Dansk exhaust before. The problems only started when I installed the headers. I can swap out O2 sensors but I can't figure out which one to do. I guess I can do them all as well.

[TMM986]

One of your 02 sensors is likely dead. Definitely worth replacing all 4 of the 02 sensors (with OEM/Bosch, not eBay specials that require wire splicing) if you haven't done so in the last 40K miles. I would also recommend replacing or at least cleaning the MAF while you're at it. Lots of threads on that...

Giving the ECU good sensor data will keep the fuel mixture properly set - could be your bad 02 sensor is causing the ECU to run too rich and hence the hydrocarbon levels being too high.

[angman]

Thanks. Any way of figuring out which sensors might be bad first? I would do all 4 but am runnin gout of time. I got a couple of used O2 sensors kicking around that I can try swapping out with.

[TMM986]

If your code reader indicated that the 02 sensor that was out of spec was "Bank 1" I believe that is the passenger side exhaust path, cylinders 1-3. You could try swapping sensors on that side and see if it helps.

http://mike.focke.googlepages.com/whatcylinderiswhere%3F


I would still recommend replacing all the 02 sensors for new OEM ones though. Think of it as being similar to only replacing one spark plug - might help a bit, but not as reliable as replacing all at the same time.

[Gent]

I've gotten a few old stinky cars through Aircare with the following cheat:

- Buy a small bottle of methyl hydrate. Typically sold as a one tank shot in 125 ml doses as fuel line antifreeze.

- wait until your tank is nearly empty. Add the stuff, put in 5 l of chevron or Mohawk 94 octane.

- give the car an Italian tune-up to get it nice and hot.

- go through aircare. Pass. Quickly fill up the tank. Methyl hydrate can be rough on the internals in high concentrations, so dilute it with a full tank asap.

[angman]

TMM986: I will eventually order a new MAF and new O2 sensors as well. I just want something temporarily help me pass my inspection first.

Gent: I'll try that tomorrow before going for the inspection.

[Sboxin]

SO -- did you pass??
And -- what did you do to pass??

TIA,
Roy