PGTI 1.8 with elusive hissing sound.

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Posts: 94
Joined: Fri Oct 05, 2012 1:21 pm
Car Make: VW
Car Model: POLO 9n4 2020 Model

PGTI 1.8 with elusive hissing sound.

Post by vintagius » Mon Sep 09, 2019 7:06 pm

Hi guys. I drive a Polo GTI 1.8. Love it or I used to before I started hearing a hissing sound when I accelerate with the windows down or sunroof open. The hiss/swoosh is similar to when a car is fitted with aftermarket HKS and Forge dumbvalves or blow off valves. It is much more noticeable between 0 - 100 and more so when the car is underload. Revving the car stationary with the bonnet lifted, the sound can be heard from the passanger side, at the rear end of the engine.

Iv also noticed that the car is a bit lathergic and the power/boost is erratic. When I bought the car it did not have this sound.

I have taken it to the dealer that sold it and a reputable vw workshop. Boostleak tests have been done and no leaks found. The PCV and the Diverter Valve were replaced and this did not rid the car of the noise.

Some hold the view that the sound is normal.But Im not persueded as other cars like mine do not make the sound and as I have indicated, I did not have the sound before.

Can I have your 2cents guys.
Posts: 315
Joined: Fri Nov 02, 2012 3:21 pm
Car Make: VW Golf 1
Car Model: 2.0 h8 valve
Location: Durban

Re: PGTI 1.8 with elusive hissing sound.

Post by 8VALVE-zn » Wed Sep 11, 2019 11:09 am

Sounds like your actuator maybe stuck or failing. You are going to loose a turbo if you don't sort it out ASAP
2000 Golf 1 Chico- CRANKCASE [Std bottom end, head gas flowed,ported & chopped by Fastcar, 288 Estas Billet, 4-2-1 43mm Brospeed Branch, 50mm-57mm-63mm Exhaust] + THE PART (2B1 speacials) -Final power @ Autotrix 111wkw & 210wnm :drool:

2011 Jetta 5 1.6 TDI DSG - CRANKCASE Tow Services [CPI Stage 1 with DPF Delete & 57mm Straight pipe]
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