AFR reading as 19.9 for first couple minutes

[grover]

When first starting my car, my sensor reads the normal 10.4 until it is warmed up, then instantly switches to showing 19.9 for a couple of minutes. After that, it begins to read normally again. Any idea what could be causing this? thanks in advance folks. I tried searching "19.9" in the archives but had no luck.

[sawnuoff]

If you give it a little gas when it is in that range does it drop down like it should or stat there at 19?

[grover]

No, it stays pegged there.

[Nitrobanshee]

that is normal, the sensor is warming up. until it is up to temp it will read strange numbers.

[grover]

Thanks for the input, but i don't think this is normal. I've had this system set up for the last year, and it has always given me a low (about 10.2) reading for the first 30 seconds or so until it is warmed up. However, after that it would give a correct reading. Just in the last week however, it is now going from 10.2 immediately up to 19.9 for several minutes.

[S.Bretz]

Try taking the sensor out of the pipe and see if its heating up....use something other then you hand to verify that its getting up to temp.