Hello.

Heading sounds kinda dumb but here's my question.

I have old camel hump heads on my engine w. non-hardened valve seats so I put some "red-line" additive in my gas for valve seat protection. The bottle states that it is cat-friendly but now I get no closed loop and O2 reads .45-.46 constantly.

The engine have about 3-4 hours running time w. additive in it.

Sure the sensor is old so maybe it was just time for it to go but before replacing it I better ask if you guys know?


Also, I would like to say thank you to all you guys out there that put info here, without it I doubt I would have comlpeted my engine swap.

Thanks.

/Bjorn

 

If your additive has lead, then yes, it will ruin your O2 sensor. Good luck.

 

Bjorn,

You are likely only reading the bias voltage from teh ECM. Either the O² isn't grounded well, is poorly connected, is too cold to generate voltage, or is contaminated or failing.

You can remove the sensor and test the output voltage in the flame of a propane torch to see if it will generate anything at all.

 

Well, I put a new 02 sensor in and so far so good. Closed loop and 02 .2-ish to .95V.

Anyway, thanx...

Now I just need to fix my transmission. A weekend of wot testing/datalogging killed 2 gear..

ps, the additive is for catalytic cars so I wouldn't think lead is in there.