DT Long Tube Headers and Y-Pipe CEL issues.

[UP driver]

DT headers O2 issues

Just an FYI - I manufacture the mini cats which are made to solve this exact problem forever. The problem is that if you install spacers, your wires smash against the frame, so how do you get correct operation without anything sticking out and without using spacers? The solution is to machine a mini-cat that goes inside the exhaust that does not protrude at all AND contains legit carb compliant material. PM me for details.

Howdy. I know this post is from a while ago, but do you still do this? Thanks

 

[AuSeeker]

Howdy. I know this post is from a while ago, but do you still do this? Thanks

Unfortunately I do believe that [MENTION=122163]duffdog[/MENTION] has stopped making and selling the "minicats", I have mentioned him in this post so maybe he will reply and elaborate, but he may not since he doesn't visit the forum that often anymore.

 

[Greasy Mike]

Solved the v8 header o2 issue. Cel, traction control & check engine light off!

After months of trial and error I finally got the check engine light, the ABS light and the track control lights to go off on my 2003 v8. Im posting this so hopefully you can learn from my mistakes. I bought the car with cracked exhaust manifolds and all the lights on the dash were lit up like a Christmas tree..

I got a set of Doug Thorrley headers from Burtmann-Industries. They took forever to finally get here due to the pandemic. Anyways I finally got them on and all I can say is buy a stud extractor socket from the auto parts store before you tear into it. I’m running a K&N intake, longtube headers, y-pipe and Gibson exhaust. NO CATS!

Now I was told to put spacers on all of the o2 sensors, front and rear. DON’T DO THIS! put the front ones in like normal and then put 2 spacers in on the rear. I got 2 strait ones from burtmann and then ordered 2 - 90` ones from Walmart of all places. You want size 18x1.5

I ended up buying all new Denso o2 sensors from Rockauto.com for a lot cheaper than the stealership and I also had to get a Toyota brand gas cap cuz the lady I got the car from bought one of those cheap ones from autozone. Also the previous owner tried to rewire one of the o2 sensors and did a crappy job. They just twisted the wire together and wrapped it in electrical tape. So after all that trouble shooting there was only one thing left to do..

I did a zero point calibration and started it up! Haven’t had a check engine code or traction control light since.

Anyways this literally took me an entire year to figure out working on it in my free time, but I hope this can help someone.

 

[4RunnerAquasport]

Now I was told to put spacers on all of the o2 sensors, front and rear. DON’T DO THIS! put the front ones in like normal and then put 2 spacers in on the rear. I got 2 strait ones from burtmann and then ordered 2 - 90` ones from Walmart of all places. You want size 18x1.5

Glad you got the CEL cleared.

Just for reference so that people are not confused.

You are correct, do not put spacers on the forward most sensors that are installed in the headers themselves. They are Air/Fuel Ratio sensors, not o2 sensors, and have to be installed like the factory configuration with NO spacers. They need to be in the normal exhaust flow to translate to the ECU if the fuel trims are working properly in real time.

The rear sensors are installed behind your Catalytic converters, and are your actual o2 sensors. They let the ECU determine if the Catalytic converter is up to temperature, and burning off the excess hydrocarbons that don't get burnt in the combustion chamber. Hence the need for spacers or simulators, when running a vehicle with no CATS.

 

[awhitney1]

Exactly, I used a 90 degree o2 simulators on the rear.

Glad you got the CEL cleared.

Just for reference so that people are not confused.

You are correct, do not put spacers on the forward most sensors that are installed in the headers themselves. They are Air/Fuel Ratio sensors, not o2 sensors, and have to be installed like the factory configuration with NO spacers. They need to be in the normal exhaust flow to translate to the ECU if the fuel trims are working properly in real time.

The rear sensors are installed behind your Catalytic converters, and are your actual o2 sensors. They let the ECU determine if the Catalytic converter is up to temperature, and burning off the excess hydrocarbons that don't get burnt in the combustion chamber. Hence the need for spacers or simulators, when running a vehicle with no CATS.