"catalytic convertor error" is too broad of a description. Whenever possible, include the actual trouble code numbers and we can look them up in a VW/Audi specific listing. Category:Fault Codes - Ross-Tech Wiki

The CAT code might be unrelated to the transmission problem.

 

See if you can recreate it while in tiptronic mode

 

Gotcha on the trouble code, just took it to Advance and they threw that at me. Same problem does not happen in tiptronic mode.

 

Then it sounds to me like this bump in revs is your car downshifting on hills as it struggles

 

Torque converter lockup kicking in and out? I'm not sure how you'd diagnose that. Possibly bad MAF fooling the ECM into thinking the engine is loaded harder than it actually is, so it's unlocking the converter to get a little torque advantage.

 

Just FYI, try to provide an overview of your question in the post's title, such as "unusual RPM increase at constant throttle". Also, mentioning what transmission and engine you have is always helpful. Assuming that your trans is an auto, the best advice is to get the car scanned with VAG-COM or VCDS software, and especially the transmission controller, otherwise known as the TCM. Steve may be correct about a TC clutch being what you feel. When engaged, the TC clutch makes the transmission behave like a manual transmission, so that if you let up on the gas, the engine speed is directly related to the car's speed. When the TC clutch is not engaged, letting up on the gas results in an immediate drop in RPMs, and applying throttle causes an immediate rise in RPM.

 

My apologies for the technicalities in the post, appreciate the inputs though. Steve… another noob question… what is meant by bad MAF?

 

Also any suggestions to further alleviate the issue assuming it is bad MAF?

 

MAF stands for Mass AirFlow Sensor. The engine computer and the transmission computer use data from that sensor to make all sorts of decisions. One of them is estimating torque load. Decisions about when and how shifts are performed (including down-shifting) are based on torque load. If the MAF is bad and telling the computers that the engine is working harder then it really is, the computers may decide to downshift (or unlock the converter) to give the engine more leverage.

Don't go replacing the MAF unless you have diagnostic evidence that it is bad. The above is just one of many things that could cause the symptoms you're describing.

 

A visual representation of the issue. Hopefully to clarify my issue

 

 

Find someone with VCDS that knows how to interpret measuring block info.

Ross-Tech: VCDS

 

Hey replied to your PM, what your describing and what your car is doing in the video is exactly what mine does. Seems like this is starting to become a common problem in these cars but with no solution yet. Hopefully we can come up with a fix soon!