i installed some fastintension test pipes along with the spark plug non foulers on the o2 sensor but im still gettin a check engine light.. a buddy of mine has the same test pipes and installed them with the non foulers and his check engine light does not come on.. the only difference from my car and his is that i have a jwt pop charger. is anyone else having this problem and is it something to be concerned about?? thanks
~eric~

 

is your buddy's car a different year? only certain year z's throw a cel

 

Get your Z scanned and then post the code. Without knowing the code we can't even be sure that the non-foulers are the cause of the CEL.

 

I have a 2006 Z and my friend has a 2004 model, we installed our test pipes at the same times with non-foulers, no test codes for me after a 1000 miles and the same for him. ...Check your o2 sensors..you may have damaged them.. We have Intensepowers resonated test pipes which are awesome...

 

did you get proper non foulers? Did you stack 2 on each side?

 

yeah stacked 2 on each side.. my buddy and i both installed ours the same way. but i still get the check engine light.

 

reset ecu and check

 

When you reset your ECU.It go's threw a diagnostic procedure WHILE the car is driving the car checks each one of the sensors at differant speeds and RPM's.After I reset my Expedition it took about a week of driving to go threw them all. The O2 sensors was the last to test.All cars are differant.

 

i take off the negative lead to the battery for about 10 mins and put it back on and then it goes away for about a day. but always comes back

 

i have the same problem. i have an 06 with borla exhaust and testpipes with the foulers stacked. ive reset my comp many times and CEL still comes back. I heard that if you put some brillo pad between the stacked fouler its supposed to help. I havent tried it thought....

 

from searching around only 2004.5 and older year Z's don't throw cel's. anything newer will.

 

hmm thats weird cause my buddies car is a 2004.5 i believe mine is a 2004? and he doesnt throw a cel

 

it must just be the luck of the draw. I have an '04 and I also have a cel. MVP motorsports sells cel eliminators which I'll be buying shortly.

 

All that work to try to cover violations of Federal Law - Emission Tampering provision of Clean Air Act.

What happens if some honest inspector decides to do a visual test for cats?
Wgat happens if you sell the car - remember to restore to oem or risk future litigation.

 

I know an 03 wont but the 05 (mine will/did) with out the non fowlers or hfc's)

But this has been talked about alot in here guys.. so the answer is here some where..

 

dont worry getting the code read somewhere I can tell you what it is (unless you broke something else in the process of installation).

P0420 - Catalytic converter efficiency
because you ......cough cough..... have no cats.

 

there's always the possibility an O2 sensor was damaged during your install. That would also give a CEL.

 

Sorry to Bump an Old thread, but with so many of these out there why make a new one right? anyway. I got a new idea and seems to be working for me so far.

I have a 2007 and as we know these are very notorious for throwing the CEL after test pipe install. after having my CEL on for a while i finally desided to take action. reading up that everyone is just stacking non foulers I desided to get creative with it and well so far it seems to be working wonderfully no CEL YET! *cross fingers*

what i did i got 2 sets of non foulers from Autozone, part number 42002 I drilled one with a 1/2" Drill bit to be able to fit the O2 sensor on it, the other one in the other hand I welded the hole shut then i took a 1/16th drill bit and drilled out a new smaller hole in the middle. I got some 00 Steel Brillo Padding from Home Depot and Stuffed it into the Welded / Redrilled non Fouler. only about half way though. I re installed the O2 sensors reset the ECM and went to town.

Usually my SES light would come on after about 25 - 50 miles of driving and Throw Codes P0420 and P0430 and well so far i drove it today for quite some time and let it idle. seems like my MPG calculator is showing positive results. as my MPG went from 86DTE when i first left my house (1/4 Tank) after a nice 13 mile drive around town i came home and had it showing 103 DTE haha i did not drive it any different so who knows what's going on but it seems to be working so far, I'll keep you guys updated.

 

300 mile update, still SES clear so far so good

 

WOW I think i actualyl finally solved the problem for the Test pipe SES on 07/08 cars 1050 mile check in with absolutely no problems