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Originally Posted by ulremember
Hello to all!
I have a serious problem with a 95 Tahoe. I have changed the EGR valve and the O2 sensor. With each change the results are worse when having it checked at our local smog station. Here is what I have:
HC (PPM) max allowed 83, measured at 200 @ 15 MPH.
NO (PPM) Max allowed 477. Measured 1621 ppm @ 15 mph
HC (PPM) max allowed 48ppm. Measured 190ppm @ 25 mph
NO (PPM) max allowed 730ppm. Measured 1516ppm @ 25mph.
I have no clue why it has gotten worse after changing the key sensors and parts. Could it be the CAT(s)?
Any help or information is appreciated by myslef and brother in law. (his truck)
Blessings to all in attendance!
Chuck aka ulremember  |
MAP sensor...check the voltage output at idle should be around 1.5volts dc. also make sure PCV is replaced and hoses to it are in excellent shape...
If the cat was bad it would not cause those very high readings..