I installed a Dynomaxx Header kit on my 2002 5.3 Chevy silverado this weekend. I also installed O2 sensor simulators in the exhaust...My trucks SES light stays on and flashs now.My truck also idles high..Anyone have any suggestions on where i should start to fix it.

 

Are you still using your EGR? If so, did you remove the tube plug from the factory?

 

No I didn't.Does that make a difference?and do you mind giving me a few more details...

 

Thanks

 

Are you talking about the EGR plug on the top of the Intake behind the Throttle body?

 

I don't think that there is an EGR on the 2002 model. I know I don't have one.

 

The O2 sims don't work for some people. A custom tune would fix that little problem though.

 

Snakeoiler is probably right, the '02s may not have the EGR; on my '00 Sierra the EGR valve has a small diameter pipe connecting to a fitting on the passenger side header. On my Dynatech Supermaxx headers, the EGR tube was plugged with a threaded brass set-screw that could be removed with an allen wrench. After I removed it, mine stopped throwing codes.

 

I threw a code on my truck after the same header install. Still does from time to time even after replacing them with the Bosch with larger heaters. P1057 best I remember. Low voltage bank 2 sensor 2. I've got hp tuner so I just disabled the ses light. EGR is something to consider but my 03 did not have EGR. I also had leaks in the y pipe that took a bit to get sealed. I'd start with a code scan to help pinpoint where to look?

 

I just wanted to thank ya'll for all the help with my problem. I am going to get a tune from Nelson & 3 dyno pulls. Oh ya,my codes are as follows: P0443 Evaprotive Emission Purge Solenoid Control Circuit; P0507 Idle Speed High; P0140 Circuit Insufficient Activity Banks 1&2 (sensor2)and P0300 Engine Misfire Detected. Total of codes. I can't believe I bought o2 sims that I can't even use!!!