p0147 on 1999 Jimmy

[jimmyGal]

Ok so I thought I had fixed this problem by replacing my o2 sensors up front, however after replacing those the code popped back up... P0147... I'm still having the same symptoms of sparatic stumbling and hesitation on accelleration and lack of power between 1500 and 2500 RPM..... Has anyone else fixed a similar problem?
I did find out there is a third o2 sensor behind the CAT, I'm most likely going to replace that one as well when I check my fuel pressure....

I need to figure out ....

DOES THE UPSTREAM OR THE DOWNSTREAM O2 SENSOR CONTROL THE AIR/FUEL RATIO?

Thanks in advance for any advice or tips

 

[Molson02536]

Ok so I thought I had fixed this problem by replacing my o2 sensors up front, however after replacing those the code popped back up... P0147... I'm still having the same symptoms of sparatic stumbling and hesitation on accelleration and lack of power between 1500 and 2500 RPM..... Has anyone else fixed a similar problem?
I did find out there is a third o2 sensor behind the CAT, I'm most likely going to replace that one as well when I check my fuel pressure....

I need to figure out ....

DOES THE UPSTREAM OR THE DOWNSTREAM O2 SENSOR CONTROL THE AIR/FUEL RATIO?

Thanks in advance for any advice or tips

The down stream O2 sensor monitors the condition of the Catalytic Converter. Start with the simple and inspect the wire harness and the Catalytic Converter... Replace if its gone bad....

Keep us posted and hope your Jimmy will be running 110% again...

Molson02536

 

[jimmyGal]

progress

ok so replaced the downstream o2 sensor and after doing so gave a new code p1416 and traced this down to the secondary air check valves one on each side... they looded pretty rough so I replaced those and code still lit... narrowed it down to the secondary air injection control valve. finally tracked down a new one and installed... bam! code gone runs better still slight hesitation HOWEVER the CAT test will not run .... no codes popping up either... in addition (i'm unsure if this is related but the battery keeps going dead within an hour of switching off (alternator good distributer wires ect good) ... now for some head scratching... I went through the drive cycle appropriate for the CAT test to run several times no luck

anyone have similar issues or know where to direct me now... I'm about to change the coil it tests within specs but i'm kinda at a loss as to how to get it to run the CAT test to pass e check :/