I just replaced the original PCV valve, could this have caused bad gas mileage?

[protomind]

I just replaced mine with a new one, and the old looked to be the original one. Could this have been affecting my gas mileage much? I guess I will find out soon enough though. My mileage has been very bad lately however.

 

[marragtop]

PCV valve can definitely affect mileage. Normally, they work or they don't. Did the old one still have the 'rattle' to it?

 

[protomind]

Yes, the old one did have the rattle, but was VERY gummed up, still getting poor mileage, I think it is actually an O2 sensor. I bought an actron code reader and will try and determine what exactly the problem is.

 

[SwaintaN]

PCV located?

Where is the pcv vale located?

 

[protomind]

Where is the pcv vale located?

Drivers side valve cover gasket, towards the back of the engine.

 

[beauboy]

OK. Now I'm confused. The PCV valve should rattle if good, but I understand about the "gummed up". I'd have replaced it too. But an O2 sensor that rattles? I don't think that's right. I've never seen an O2 sensor that rattled and still be good.

 

[James909]

You're right, an O2 sensor should not rattle. I think when he was talking about the O2 sensor he was referring to it as what is causing the poor mileage not the rattling.