Intake modification & Engine light.

I am new to this site, but I have been to many others like this. I have quite a bit of modifying experience, but on other than tacomas.

I have 2008 Tacoma with 2.7L. I have made my own intake and installed it. I removed the black resonator that connects to the throttle body, and installed an elbow and pipe straight down to the air filter box and placed a K&N filter on the end. I also cut an exact hole for AIT / AIC sensor .

My problem is the vaccuum tube that ran to the resonator (i have reconnected to the elbow where my throttle body is connected).

The car runs fine, but after about 10 miles, the check engine light comes on. I have tried extending the tube and coiling it to maybe reduce the air flow, but still the light comes on.

I was wondering if anyone had any ideas of how to stop the light from comming on (without reinstalling the resonator)

I have added a pic of it in the bottom post....

 

No. I haven't. The wife has it at work. Also why i didnt post any pics yet either.

 

Well it took some time to figure out how to upload pics, but here is what I have done.

If you look towards the right, there is wiring harness with vaccum tube wrapped around it and a vaccum advance (I think): it would run to the back side of the resonator (black box); which was not connected near the direct wind velocity of the intake. Since I have connected it there at the elbow; which I think is causing it to draw more air current through the vaccum tube causing the light to come.

 

She went by today and got the code read...

P0101

MAP / BARO or MAF / VAF sensor condition.

1. Vaccum hose off, cracked or passage blocked.
2. Throttle body intake tubeloose, off, or cracked.
3. BARO / MAP defective.
4. VAF / MAF sensor dirty or defective.

Is that 2 different sensors, being called 2 different names, or is it one sensor being called 4 names?

I would assume the MAF / VAF is the one installed in to the alluminum tube.
And, maybe the other is the one bolted to the back of the resonator?

How likely is it to have gotten that ensor on the tube dirty or damaged. I took extreme precaution when handeling it.

 

No.. the only hose that was different after the modification, was a hose that went off a side chamber of the original air intake/resonator (that was not in the direct air flow). I have that now going to the direct air flow of the intake I installed.

 

I may have bumped it, but not anywhere near hard. Never dropped it.

 

Yes all the connections are connected,. Yes I cleared the codes. The code does not come on right away either. It takes 5-8 miles of driving before it comes on.

I am thinking, since I connected the tube to the direct airflow (and not to the chamber on the resonator) is creating more vaccum in that line. I tried restricting the tube, by making the hole through it smaller. This did something, becuase the engine light didn't come on for more than twice that distance. Which leads me to believe that the computer is set to read air pressure through that line and I have changed that. Thus, causing the light to come on.

If the MAF was bad, not plugged in, or not working properly, the engine would not turn over and run. Which it does and drives fine.

I think i either have to put the resonator back on, live with the light, and/or find a way to doctor the hose to trick the ECU in to thinking it is reading the right pressure.

 

Sorry been out of town..

I have been driving it this week (it was wife's). At home, I clear the code, and I sits till morning. I drive to work, about 10 miles, and no light. When I get off work, it then comes on at different points in distance on the way home. I clear code again, and do it all over.

Thanks Chris.. that harness thing might be helpful.. I had moved it and it was not in original position. We'll see when i get home from work tomorow.

Another question.. I can't find a good enough picture of it.

On K&N or another of the style, does the intake have a place to attach the crank case breather line?

I have just put a crankcase breather filter on it.. maybe that is what is causing the CEL?

 

Well.. the harness was not it.

Next is to install the crankcase breather line to intake, and clean the MAF sensor.