stickybones
What?
- Joined
- Dec 27, 2001
I've always been able to pass NJ state emissions in the past; typically without even being close to the limits. Essentially I just pop in a TT emissions chip and I'm good to go (functional Cat, EGR, etc.). No visual checks, just the tailpipe sniffer at idle and at "high idle" which is probably something like 2000 rpm. This year I failed: idle HC ppm was 459, CO% was 0.07, CO2% was 14.2 and O2% was 1.4. No NOx values. High idle was HC-24, CO-0.11, CO2-14.9, O2-0.2. Based on the HC/CO numbers, I thought I was running lean at idle. I adjusted my Translator Plus to put the Base MAF on 0 (no change) instead of the setting of 2 (lean) that it normally resides at with my Extender chip (which I use exclusively except for emissions testing). With the new Translator setting, I went back and failed worse. Idle values were HC-769, CO-0.46, CO2-13.5, 02-1.6. Fast idle values were HC-632, CO-0.16, CO2-6.8 and O2-10.5. For those that know, the only thing above the limit is HC which has a max standard of 220.
I haven't gotten a chance to pull the plugs to read them. The car otherwise runs nice and strong like normal.
The question I have relates to the screen in the LS1 MAF. A week before I went for emissions testing, I decided I was going to clean the MAF. When I removed it, I noticed the screen was damaged (still intact though). I don't think a foreign object hit it. I just suspect that since my MAF is positioned horizontally in the up pipe off my front mount intercooler, the "high pressure" air stream might have damaged it over time. Seeing that it was damaged, I simply removed it, used MAF cleaner spray on the elements and buttoned things back up again. I far as I can recall, this is the only thing different from previous years when I passed emissions w/o issue.
Anyone think the screenless MAF is the cause of my problem? I'm wondering if turbulent air is crossing the MAF and it's not reading properly for fuel management.
I haven't gotten a chance to pull the plugs to read them. The car otherwise runs nice and strong like normal.
The question I have relates to the screen in the LS1 MAF. A week before I went for emissions testing, I decided I was going to clean the MAF. When I removed it, I noticed the screen was damaged (still intact though). I don't think a foreign object hit it. I just suspect that since my MAF is positioned horizontally in the up pipe off my front mount intercooler, the "high pressure" air stream might have damaged it over time. Seeing that it was damaged, I simply removed it, used MAF cleaner spray on the elements and buttoned things back up again. I far as I can recall, this is the only thing different from previous years when I passed emissions w/o issue.
Anyone think the screenless MAF is the cause of my problem? I'm wondering if turbulent air is crossing the MAF and it's not reading properly for fuel management.