LOSS OF POWER! NEED HELP!!! 1998 VORTEC TAHOE

[350VortecSSCT]

Well let's first start off Im throwing a po420 (Bank 1 sense 1) been replaced a few times. Once in awhile my "Check Gages" will flutter on my dashboard

I've noticed since then, loss of power, weird shifting, poor acceleration, and rpm/idle being off

SOMEONE PLEASE READ THIS AND CONTACT ME (203)984-7077

 

[Horns]

First off, no ones gonna call you. Just keep checking this thread.

-Via Mobile-

 

[GMstrong]

install 2 new upstream o2 sensors.

 

[350VortecSSCT]

Did that and now it's bank 1 sense 1 I just replaced it! Damn it!

 

[oohunter04oo]

A P0420 DTC is Catalyst System Efficiency Below Threshold... i would bet that you Catalytic Converters are clogged. i would recommend removing both front O2 sensors and take her for a drive, if you get your power loss back then you know its the Catalytic Converters that are plugged. replaced them and roll out!

 

[Chris.G.Jr.]

why dont you take it to the dealer since you have that motor under warranty, have them fix it

 

[oohunter04oo]

why dont you take it to the dealer since you have that motor under warranty, have them fix it

If he has a crate engine that is under warranty the only thing the warranty will cover is the engine.

 

[OpTic_G1BBY]

You could have a cracked head same thing happend to my 350 a month or so ago loss in power no acceleration put it to the floor and would hit 60 in around 20-30 seconds but if the head is cracked make sure that the water and the oil isnt mixing like it was in mine it is a formula for disaster.