There's a significant flaw in the design of the Injen intake pipe for 1MZ vehicles. The IS2030 has the PCV breather barb IN FRONT of the MAF. Not only will this dirty your MAF extremely quickly with oil vapor, but as you'll see, it has a significant effect on the closed loop fuel trims.
I've FINALLY tracked down my +5-10% fuel trims. And yes, this was it. The PCV breather tube in OEM setup is AFTER the MAF closer to the throttle body. This means that it should be UNMETERED. In the Injen setup, the PCV is METERED and will affect fuel trims across the board. Also, because of the proximity of the PCV barb to the MAF, it disrupts the MAF readings to read LOWER than normal, which causes the ECU to bump up the fuel trims when the O2/AFR sensors detect a lean condition.
Here's the data (there's a LOT of it, but just look at the STFTs and LTFTs):
I emailed Injen about this and Injen has not yet responded to my email. I'm really not sure what to do with them anyway. I turned my intake pipe and MAF around, and it works for now, but still, it's not working properly as designed. I guess that's what I want resolved for everyone.
Here's the conclusive proof:
Pre-pipe+MAF turnaround:
Jan 2011: http://webpages.charter.net/jaybe/Toyota-Solara-1999-January 04 2011.csv
Oct 20 2011, a full year after I received my BAR sticker: http://webpages.charter.net/jaybe/Toyota-Solara-1999-October 11 2011.csv
Feb 17, 2012: https://docs.google.com/open?id=0B_piOguU9u__WVpqUDQtcHFWdzg
Post-pipe/MAF turnaround:
And here is today's in 2 parts, first is cold start+normal driving, second is hard driving/WOT runs; notice the STFTs and LTFTs specifically:
First: https://docs.google.com/open?id=0B_piOguU9u__ZTRFUU13dkhtUTg
Second: https://docs.google.com/open?id=0B_piOguU9u__Y18xY2Jmb3I0WkE
IMO, that's a very LARGE difference in fuel trimming. I should also send this to Injen. I'd rather not contact the CARB because they might redact the executive order. Haha.
The only thing I miss is the popping and snarling from the exhaust. It's certainly toned down with less fuel to ignite. Anyway, I'm not happy that this was the cause of my issues, considering that it was CARB exempt and should NOT have influenced smog tests.
Here are all of my BAR smog tests:
https://picasaweb.google.com/109954996220236406731/SmogReports1MZ
My passing test was with 1-step hotter spark plugs (K16TR11 for the 5VZFE).
I should note that I may have had a small vacuum leak or exhaust leak which bumped my fuel trims to +25% and 34%, but the Injen intake added quite a bit to that as well.
Corrected fuel trims were:
Before: +12% rear bank (+5%+7%) and +10-14% front bank
After: -7% rear bank and 0% front bank
I'm only posting this because as our engines and emissions systems age, you may FAIL a smog test due to this.
Also keep in mind that I failed the 15mph test with a BRAND NEW catalytic converter. That's not good.
I've FINALLY tracked down my +5-10% fuel trims. And yes, this was it. The PCV breather tube in OEM setup is AFTER the MAF closer to the throttle body. This means that it should be UNMETERED. In the Injen setup, the PCV is METERED and will affect fuel trims across the board. Also, because of the proximity of the PCV barb to the MAF, it disrupts the MAF readings to read LOWER than normal, which causes the ECU to bump up the fuel trims when the O2/AFR sensors detect a lean condition.
Here's the data (there's a LOT of it, but just look at the STFTs and LTFTs):
I emailed Injen about this and Injen has not yet responded to my email. I'm really not sure what to do with them anyway. I turned my intake pipe and MAF around, and it works for now, but still, it's not working properly as designed. I guess that's what I want resolved for everyone.
Here's the conclusive proof:
Pre-pipe+MAF turnaround:
Jan 2011: http://webpages.charter.net/jaybe/Toyota-Solara-1999-January 04 2011.csv
Oct 20 2011, a full year after I received my BAR sticker: http://webpages.charter.net/jaybe/Toyota-Solara-1999-October 11 2011.csv
Feb 17, 2012: https://docs.google.com/open?id=0B_piOguU9u__WVpqUDQtcHFWdzg
Post-pipe/MAF turnaround:
And here is today's in 2 parts, first is cold start+normal driving, second is hard driving/WOT runs; notice the STFTs and LTFTs specifically:
First: https://docs.google.com/open?id=0B_piOguU9u__ZTRFUU13dkhtUTg
Second: https://docs.google.com/open?id=0B_piOguU9u__Y18xY2Jmb3I0WkE
IMO, that's a very LARGE difference in fuel trimming. I should also send this to Injen. I'd rather not contact the CARB because they might redact the executive order. Haha.
The only thing I miss is the popping and snarling from the exhaust. It's certainly toned down with less fuel to ignite. Anyway, I'm not happy that this was the cause of my issues, considering that it was CARB exempt and should NOT have influenced smog tests.
Here are all of my BAR smog tests:
https://picasaweb.google.com/109954996220236406731/SmogReports1MZ
My passing test was with 1-step hotter spark plugs (K16TR11 for the 5VZFE).
I should note that I may have had a small vacuum leak or exhaust leak which bumped my fuel trims to +25% and 34%, but the Injen intake added quite a bit to that as well.
Corrected fuel trims were:
Before: +12% rear bank (+5%+7%) and +10-14% front bank
After: -7% rear bank and 0% front bank
I'm only posting this because as our engines and emissions systems age, you may FAIL a smog test due to this.
Also keep in mind that I failed the 15mph test with a BRAND NEW catalytic converter. That's not good.
