Today I grooved a 2002 Pontiac Bonneville with the 3800 engine. It took me about 50 minutes. That car is my wife's with 73000 miles. I removed the screen on the throttle body and have not blocked the pvc valve yet. I will post my mpg after I plug the valve.
Thanks Ron for the help.
God Bless,
Dave

Update on the Pontiac Bonneville,
I have blocked off the pvc and half of the air going into the intake. I used duck tape to block half on the throttle body screen. My fuel trims are now, short plus 5 to minus 6
long are minus 6 to minus 20. I will post mpg after a few tanks.
Thank you,
Dave from Michigan

Hi Dave, Sounds like the modification is coming along.

Will you please clarify how you blocked the PCV? This is not recommended as your engine still needs to have ventilation. In order to increase the vacuum available to the Groove, it is recommended that the port on the intake (where the PCV hose connects) be plugged and the PCV hose be rerouted to the intake air stream. Maybe this is what you did, I just wanted to clarify for our readers.

Thanks, Nick

Nick,
The pcv that I blocked off on the 3800 engine it is under the map sensor. I used jb weld on the pcv valve. On this motor I can not run it to the intake before the throttle body. I have the other pcv line hooked like
factory. I hope I did it correct.
Thanks,
Dave

Sounds like you did it fine. I am just making sure your engine is still breathing all right.

As a discussion point to everyone, sometimes the PCV is attached to the intake and that needs to be plugged to prevent the vacuum leak. The ventilation from the valve cover needs to be mainained and vented appropriately.

It is important that we all try to be clear when we are discussing the PCV. If we can all discuss this topic as the active crankcase ventilation, it would great. Active means it has vacuum applied to it. Passive, the other vent, is vented to the atmosphere ie. the intake air stream. We are blocking the active engine vent at its vacuum connection to the intake and leaving the ventilation vented to the atmosphere into the intake airstream.

I say all this as clarification for us all to discuss. I have spoke with quite a few folks this week and this subject is not clearly understood by many and when not done properly will result in less favorable results. Any thoughts...

I agree Nick,

Even at the shop I work at, our computer manual calls it one thing and the parts dept calls it another. We are all getting an education and this is good - "on the job training". Not all engines operate the PCV or Vent system the same. Some have a traditional "shaker" valve in the valve cover, some have it imbedded under a cover in the intake. I've grown used to GM's and over the last few years they have changed.

Scott Castleberg
Pellston, MI
Gadgetman Michigan