Raudi_6 akaDeutschMF

I've been hearing a high pitched whine, cant pinpoint the area. This only occurs when driving, (not revving in Neutral), and while accelerating past 3.5K Rpms. At first I thought it may be an air leak with my CAI, so I tightened down all the clamps. Since Ive had the CAI, I would hear an air-whooshing sound coming from the CAI on accel. AlSO, sporadicaly I feel some hesitation during accel, but at low RPMS, it runs fine. Please help, Ive already dumped thousands in the engine, and just want it to run at status quo for a while until I begin any more upgrades!
TIA, Justin

DeutschlandATL

First off, if you have heard air rushing since you installed your new CAI, I would assume the problem is related to air flow, boost, or lack there of. You could have leaks in the intake, or boost system. You could pay for a pressure test at a shop to check for leaks. Or you can search the forum and learn how to test pressure yourself. You could use a VAG-COM to scan for codes. A positive charge deviation code could indicate that a boost leak has occured as well. And lastly, you do have a chip. You might notice a difference if you were to revert to a stock ecu. Like the other guy said a few threads below, a lot of your problems will go away when you are back to the stock levels of airflow, psi, and fuel injection. I'd hate to give up a chip, but I'd be more concerned with getting it fixed ASAP, or just going back to stock and seeing what changes. Also, VAG-COM for misfires and value blocks, and make sure everything is working as it should be. It's always a process of elimination when diagnosing problems like this.... Good luck

Raudi_6 akaDeutschMF

Thanks for the in-depth response. This engine is a P.I.M.A.!

quickaudi:STFA

secondary air injection?

Raudi_6 akaDeutschMF

I just recently had my PCV Valve replaced, possible that they may have made a mistake?

Raudi_6 akaDeutschMF

I caused a leak in the air intake. So I changed the clamps on the hoses and no change. Still high-pitch whine. Stupid question, but the coolant goes above the max line when warm, could it be spraying out leaking steam out a hose when under pressure?

quickaudi:STFA

tiptronic cars have secondary air injection to help with emissions. at some point, they fail; i'm surmising that you might want to check yours to make sure it isn't your culprit.

quickaudi:STFA

highly doubtful. why do you ask?

quickaudi:STFA

might be a good idea to get your codes scanned, even if it's at a local parts place.

Raudi_6 akaDeutschMF

process of elimination.