I installed the Weapon R Header and Injen CAI intake a few weeks back and I've been getting a CEL since. I have a anti fouler installed on the s-pipe.cleaned the MAF sensor 2 times and I continue to get a CEL. I finally could not take it and went to Toyota I have a scanner
and I'm throwing a Code P0171 (system to lean) I knew that before I went. and as soon as my friend that works there looked at it he's like the metal gasket is too big for the aftermarket header. Is there a fix to this? Weapon R says to re use the factory gasket and they do not make one.
I have not a clue what to do to anymore I'm about to change back to the factory header. The hole that is exposed lets exhaust out.

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You're the only one I can think of that has installed the header...

Have you tried contacting Weapon-R directly?

 

i've never had a CEL problem with mine. antifouler supposed to do the trick for the header. i really dont think the gasket has anything to do with it in my opinion but who knows... wish i could help but i used to run CAI with weapon r header and never had problem now i run the header with my s/c and still no problem.

double check your intake to make sure nothing is lose.

 

i figured that i'd be the only person I've called weapon r they said to reuse the factory gasket....... I'm on another forum they said to use gasket maker the ultra copper RTV stuff

 

I've looked at everything. I took it to Toyota and the Tech felt the exhaust coming out of the hole.

 

I take it you installed the header yourself?

I know you said the tech checked the bolts. Did he check them the engine was still hot? It can make a difference.

If the bolts are all tight, even at temp, I'd suggest taking the header off, check the gasket for damage and reinstall everything. It's kind of a pain, but might save you some money. If something shifted or the gasket was damaged when you reinstalled it, you might just find your problem.

 

are you talking about the bolt holes? and are you using the 90 degree elbow or just more washers to move the O2 sensor out the flow?

 

Chances are that code is from the CAI, not the header.

 

Did you try using the two spark plug antifouler trick on the second o2 sensor?

This trick works about 90percent of the time

Its not the CAI its the header and the second o2 sensor is throwing your code.

get two spark plug anti foulers drill one out so the sensor can screw into it take the second anti fouler screw it to the first anti fouler and ill pretty much guaranty this will be the fix you need.

good luck

 

A system too lean code means there is too much air flow and not enough fuel delivery. This happens quite a bit with cold air intakes on the 1G tC.

 

yes I've done that.

 

nooo its a hole more like a uncovered space between pipe 2-3 on the header which exhaust is leaking out from.

 

the car was hot when he checked everything i was going to use a gasket maker today to cover the hole up and see if that fixes the code.

 

I don't think its the CAI. The Header has a leak coming from the seal.....

 

I have Headers and Cold-Air installed in my tC2....question do u have a Short Ram or coldair installed..cuz my car throws cell with cold air but when Short Ram is installed cell actually goes away instantly

 

I have the Cold Air Injen Intake installed. Its switchable to Short Ram tho. Should I try that?? My mechanic felt the exhaust slipping out from the header i was gonna do a soapy water test in a little.

 

Yea someone told me do the same...but when i switched to short ram and put cel eliminator on the check engine light went away..but honestly i do feel like it cud be the exhaust slipping out from headers cuz the piping size is way off..i had to do a little custom work so i can get it to fit snug. When u do the test let us know what the results are!

 

i have a cel eliminator on the s-pipe 02 sensor i took the one on the header off because weapon r recommend that it would not be on the header. what type of work did u do to get the header to fit correctly?

 

my mechanic used a different gasket from the header to exhaust because he said the one given did not fit well enough and allowed air to leak out so he did some extra stuff just so that it fit snug and we used different bolts on the header as well cuz the ones given did not fit perfectly.

 

i think we used the factory bolts we used the same donut that weapon r supplied. its the metal gasket that goes between the engine block and the header that is causing issues for me. i was gonna try and seal it with the gasket maker stuff