dougn

what's causes this? the HC and CO were pretty low 6 and .01 respectively.

this test is run on rollers at 15 and 25 mph, small throttle openings, 1800 rpms for 15 mph and 2150 for 25 mph

chancecasey

Are you sure your engine was completely warm at the time of the test? Sometimes, you car sits and cools for a while before they get to it. These old cats need to be very hot to ensure they do their job.

Can't comment on the gasious mix and whether that portends anything.


How's the new tranny working for ya?

dougn

well i went out and warmed it up pretty good and it didn't sit around but it was a pretty cool day. high NO means something but i forget what...

Lorenfb

"what's causes this?"

A performance chip with too advanced timing and/or a bad CAT, or too lean a mixture.

Check here for more info: www.systemsc.com/problems.htm

LA964RS

You've got to run the sh*t out of it before you go there and keep the cats hot. They smog guy should know that as well. I'm mean keep them HOT....I've failed before and hung out and let it run for a good long time, then let them roll it again and it passes. I usually go for a 20-30 minute run and then have them load it straight onto the rollers.

Steven C.

I also always put in a bottle of the fuel freeze preventative(that I can't remember the name of now?). In a yellow bottle.

Cupcar

I failed and the above worked for me.

dougn

thanks all...i will try installing my stock chip and a better warm -up

chancecasey

Yeah, after reading about the cold cats issue I just sat in my car with it running (after driving it for a while) until it was time to drive it onto the rollers.