need help!
have a squeelin sound comin out my tail pipe at bout 2500 rpm's, or under a load.... took it to a muffler shop to get cats checked out...he says i dont need them...and he even cut a hole to look in...he had been doin this for +20 yrs....what could it be?????
also...hookd up a scan tool and pulled codes: p0420

specs:
99' v6 2wd auto 3.4l

and yes, check engine light is on and i got both new oem O2 sensors from toyota/denso, new TPS and new MAF

 

what kinda ride u got? what year, model, engine, etc

 

wait what?

He cut a hole in your exhaust to "look in"??!?!?!?!

 

so you just got back from Bubb Rubb's I reckon ?

http://www.youtube.com/watch?v=6lUnG4uZPTo



da whistles dey go wooo WOOOOOOO

 

p0420 means your cats arent working right.

i imagine you have a 3.4 with a lot of miles on it. cats need replaced on all trucks. probably time for yours.

 

yeah, now that theres holes in it....

 

a p0420 can be just a bad o2 sensor. heck i had a 420 (on april 20th go figure) and got a new toyota 02 sensor and code-b-gone for several
thousand miles now (though it could come back when my cats actually do go bad, and that can be anytime...I haz 150,000 miles +)


but when there is a different noise out the pipe, something
is physically corrupting the channel

in yer case I am betting the cat honeycomb is coming apart and clogging
the works. u need a new cat. cat can asplode when you have other trouble
and do not know. a rock hits the cat, misfire, an unburned fuel explosion,
backfire...all this can destroy a cat. seafoam or other so called treatments
can also cause the cat to overheat and blow apart.

simple age too...

 

Not to hijack but you guys are getting the check engine light when you pull these codes right? Or are you gettin these codes with out it throwing the light?

 

Thanx Guys...apprieciate All Your Feedback