Pcv Causing Codes?

DSN46 · August 5, 2008

Hello,

I recently posted about O2 sensor codes I was getting..."low voltage bank 2" and "cat readings below threshold"....

At any rate, I thought it might be due to an exhaust leak (which I haven't totally counted out yet), but I came across something strange today.

I was replacing plugs, plug wires and PCV valve. When I pulled the original PCV, I noticed it was empty! Nothing inside. Just an open hole from the bottom to the top and it was covered in oil. I've been changing PCV valves my whole life and have never seen a hollow one.

I reset the codes with my scan tool after replacing everything. Have been driving it around all day and no codes yet! It usually throws a code within 10 miles of driving after reseting it.

Could the jacked-up PCV valve been the cause of the error codes from the the O2 and CAT?

Please chime in with any thoughts... I need to know if I should keep worrying about more expense to come.

Thank you,

James

bossier62guy · August 6, 2008

Hello,

I recently posted about O2 sensor codes I was getting..."low voltage bank 2" and "cat readings below threshold"....

At any rate, I thought it might be due to an exhaust leak (which I haven't totally counted out yet), but I came across something strange today.

I was replacing plugs, plug wires and PCV valve. When I pulled the original PCV, I noticed it was empty! Nothing inside. Just an open hole from the bottom to the top and it was covered in oil. I've been changing PCV valves my whole life and have never seen a hollow one.

I reset the codes with my scan tool after replacing everything. Have been driving it around all day and no codes yet! It usually throws a code within 10 miles of driving after reseting it.

Could the jacked-up PCV valve been the cause of the error codes from the the O2 and CAT?

Please chime in with any thoughts... I need to know if I should keep worrying about more expense to come.

Thank you,

James

You probably have a fixed orifice type PCV...no check ball involved.

DSN46 · August 6, 2008

Thank you for the reply!

Didn't know there was a "fixed orifice" type. So my next question is: will it hurt to have the check-ball type in there? It is running fine, and like I said, no more codes now. The parts house didn't show a fixed orifice as an option. How would I find out which type my 5.3 takes?

Thank you for any information.

James

bossier62guy · August 6, 2008

Thank you for the reply!

Didn't know there was a "fixed orifice" type. So my next question is: will it hurt to have the check-ball type in there? It is running fine, and like I said, no more codes now. The parts house didn't show a fixed orifice as an option. How would I find out which type my 5.3 takes?

Thank you for any information.

James

There's no need to replace it w/ the older type if it's working fine. The fixed orifice type came about because of gunk building up in the throttle body. My 02 Silverado came w/ the old check ball type but now has the fixed orifice type installed as part of a service bulletin that was out concerning "throttle pedal hard to push". Put your finger over the hole while it's running and see if it's working and if so just leave it alone.

ZX1100F1 · August 6, 2008

The only TSB on an 02 regarding the PVC system is due to oil leaks or oil consumption, light duty GM trucks did not incorporate a check-ball style PCV valve in 2002, they use a PCV fresh air line and a vented oil cap.

The TSB regarding "throttle pedal hard to push" which actually read: "Increased Accelerator Pedal Effort" was issued for 1999 and 2000 model year and required the replacement of the throttle body.

DSN46 · August 6, 2008

Well, I read-up on all the TSB's and posts concerning this same issue. After reading til my eyes bled, I promptly went out and dug the old fixed-orifice valve out of the trash, cleaned it up all nice and shiny and put it back in. (Now I have an extra check-ball valve). I guess I could have just left the check-ball in there and waited to see if I started burning oil or something, but I'll just leave it alone. It has a factory part number on it, so it was probably put in by someone more knowledgable than I.

Thank you all for your help with this. I would have searched "fixed-orifice" to begin with and not bothered you all, but I had no clue to search for those terms.

Take care,

James

bossier62guy · August 6, 2008

The only TSB on an 02 regarding the PVC system is due to oil leaks or oil consumption, light duty GM trucks did not incorporate a check-ball style PCV valve in 2002, they use a PCV fresh air line and a vented oil cap.

The TSB regarding "throttle pedal hard to push" which actually read: "Increased Accelerator Pedal Effort" was issued for 1999 and 2000 model year and required the replacement of the throttle body.

You better polish up on your info "sparky".....I've got a 2002 Chevrolet Silverado purchased brand new by yours truly that came w/ a check-ball style PCV system. I performed TSB 02-06-04-054B myself to change it over to the fixed orifice style.

bossier62guy · August 6, 2008

The only TSB on an 02 regarding the PVC system is due to oil leaks or oil consumption, light duty GM trucks did not incorporate a check-ball style PCV valve in 2002, they use a PCV fresh air line and a vented oil cap.

The TSB regarding "throttle pedal hard to push" which actually read: "Increased Accelerator Pedal Effort" was issued for 1999 and 2000 model year and required the replacement of the throttle body.

Read it for yourself! http://www.gm-trucks.com/forums/lofiversio...php?t51692.html

ZX1100F1 · August 6, 2008

Read it for yourself! http://www.gm-trucks.com/forums/lofiversio...php?t51692.html

This bulletin only applies to cable operated throttle bodies not throttle-by-wire systems, check your throttle control and I can almost guarantee that you have the T-B-W throttle body.

bossier62guy · August 6, 2008

Read it for yourself! http://www.gm-trucks.com/forums/lofiversio...php?t51692.html

This bulletin only applies to cable operated throttle bodies not throttle-by-wire systems, check your throttle control and I can almost guarantee that you have the T-B-W throttle body.

Once again you'd be WRONG!!! Do your homework....

ZX1100F1 · August 6, 2008

Once again you'd be WRONG!!! Do your homework....

Uh huh right whatever, you claimed that:

"My 02 Silverado came w/ the old check ball type but now has the fixed orifice type installed as part of a service bulletin that was out concerning "throttle pedal hard to push"

The TSB that you referenced does not state to change the PCV valve, it doesn't appear that you know what you're talking about.

MS3DALE · August 6, 2008

The only TSB on an 02 regarding the PVC system is due to oil leaks or oil consumption, light duty GM trucks did not incorporate a check-ball style PCV valve in 2002, they use a PCV fresh air line and a vented oil cap.

The TSB regarding "throttle pedal hard to push" which actually read: "Increased Accelerator Pedal Effort" was issued for 1999 and 2000 model year and required the replacement of the throttle body.

Read it for yourself! http://www.gm-trucks.com/forums/lofiversio...php?t51692.html

Hey,I posted those!!!

bossier62guy · August 6, 2008

Once again you'd be WRONG!!! Do your homework....

Uh huh right whatever, you claimed that:

"My 02 Silverado came w/ the old check ball type but now has the fixed orifice type installed as part of a service bulletin that was out concerning "throttle pedal hard to push"

The TSB that you referenced does not state to change the PCV valve, it doesn't appear that you know what you're talking about.

Obviously you can't read either....damn I hope you're not a GM Tech.....

bossier62guy · August 6, 2008

Once again you'd be WRONG!!! Do your homework....

Uh huh right whatever, you claimed that:

"My 02 Silverado came w/ the old check ball type but now has the fixed orifice type installed as part of a service bulletin that was out concerning "throttle pedal hard to push"

The TSB that you referenced does not state to change the PCV valve, it doesn't appear that you know what you're talking about.

What does this say "McFly"? Pulled right out of the TSB I referenced above...

Inspect the vehicle for installation of a fixed orifice PCV valve, refer to Corporate Bulletin Number 01-06-01-029B for PCV valve identification. Vehicles undergoing this throttle body procedure MUST use a Fixed Orifice PCV Valve, P/N 12572717.

Clean throttle body bore and throttle valve plate of carbon using a shop rag and an appropriate cleaner. Refer to Engine Controls Repair Procedures - Throttle Body Cleaning Procedure.

MS3DALE · August 6, 2008

Once again you'd be WRONG!!! Do your homework....

Uh huh right whatever, you claimed that:

"My 02 Silverado came w/ the old check ball type but now has the fixed orifice type installed as part of a service bulletin that was out concerning "throttle pedal hard to push"

The TSB that you referenced does not state to change the PCV valve, it doesn't appear that you know what you're talking about.

You might have to change it though,You have to have the "Fixed orifice PCV valve" to do the throttle body modification,From the TSB....

"Inspect the vehicle for installation of a fixed orifice PCV valve, refer to Corporate Bulletin Number 01-06-01-029B for PCV valve identification. Vehicles undergoing this throttle body procedure MUST use a Fixed Orifice PCV Valve, P/N 12572717"