found the problem

well guys, i found the problem to my rattling valves and the backfire is b/c of the downstream (behind the cat) O2 sensor. idk much about these except that they read exhaust gases and send back to the ECU for correct air/fuel mixture? i think anyways lol correct me if im wrong on that. is it possible just to clean one of these sensors? i mean if theres anyway to avoid buying a 130 dollar sensor, i need to know. plus its still dirty when we went muddin a few months back...i know it sits inside the exhaust but could this affect it? help and advice is greatly appreciated.

 

i just replaced the front o2 sensor for 106$. carquest. I think its a bad place to try to skimp because it can screw up all kinds of things. Mine was telling me that there was insufficent engine temp because the sensor didnt read the EGT and told it it was cold and dumped the fuel to it. Id play it safe and replace both and not have to worry about it. I kinda figure toyota engineers might know a little more aobut this stuff than us so it there for a reason

 

The O2 sensor is more than a sensor....
Here's a scan I took out of my 96 service manual. The last paragraph in paticular....


Bank 1 Sensor 2 is the sensor after the CAT and that's the easier one to replace.

Try calling Conicelli Toyota - online prices are pretty good. Tell them you're from TTORA. I think they'll still doing discounts for them..atleast, that's what I used to do.
http://conicellitoyota.com/partznet.aspx

Also - you can call around to get prices from dealers and then call your local dealer back and say "I found it at XXX price online" and sometimes they'll honor that price for you.

 

i found a BOSCH 02 sensor heres the site http://www.rockauto.com/catalog/raframecatalog.php?a=G-toyota

its the very first part for 80.79, tell me what you guys think, should i buy it?

 

Avoid Bosch, stick with the Denso sensor. You can get it for pretty cheap here: http://www.urdusa.com/product_info....d=430006000&osCsid=lm6953q9q1flffhr2fj91k0ot7

 

alright, but if i buy the denso for the back, will that screw up the upstream O2 sensor?