Does anyone know if there are any distinguishing features on the 04 sedan non revup lower plenum. I am asking because I think a mechanic might have changed mine out, after I had some work done, the car seems slugish. The only thing I have noticed is the # 5 on a metal tab at the front of the lower plenum which I didn't notice before. Are there any other markings to tell the revup from the non revup lower plenum.
Thanks
Jtspea2

 

I have the same exact question. Whats the deal? Why is there the number five tab on my lower plenum?

Can everyone post pics of there plenums?

• Rev up/Non rev up
• All years
• Coupes, sedans, 350z, nismo.....

Much appreciated.

 

Why would your mechanic want you lower plenum If you recently had work done to the car, the mechanic most likely disconnected the battery while doing the work. This clears ECU memory. It takes about 40 runs for the ECU parameters to establish. For those first few runs, the car is going to feel a bit sluggish because the ECU is running a rich air fuel ratio (safe) until it acquires more data and throttle inputs to determine what's a safe A/F ratio, timing, etc. The basically needs to learn where it's being driven (temp, altitude, pressure) and how the driver drives.

 

Thanks for the information Dave, but this does not quite answer the question. Mine has the same tab on the lower plenum to the left. My upper plenum does not completely match the bolt holes on the the lower plenum. Two bolt holes are off or something.

 

Normal.

 

will you post pics of yours?