Polo GTI turbo intermittantly not spooling

**h100vw** · 04-12-2012, 09:06 AM

Originally Posted by bn1986

Im in roseville.. Ive got an obd2 scanner which ill rummage around for and have a scan..

What do you mean by 008? Is that a forge DV? i've got the apr one which is a membrane based DV which apparently has an infinite service life?!

Id definitely appreciate a 2nd pair of eyes having a look over it at some stage though... Ill keep you in the loop?

Don't discount anything, It's the simplest thing to check the DV is good. Assume nothing.

Gavin

**Stan** · 04-12-2012, 10:25 AM

Also try wastegate acutuator, make sure it isnt getting stuck, and a whole bunch of hoses... good luck

**bn1986** · 24-06-2013, 02:22 PM

Hey guys still ongoing saga.. Still intermittently won't spool. Checked visible vac hoses on top, nothing broken. Swapped DV back to oem. No improvement.

Fitted boost gauge, when she's not working she just sits on 5psi and can quite clearly hear that the turbo isn't spooling.

What could cause the waste gate to get stuck? What should I look for under the car?

**VWindahouse** · 24-06-2013, 02:35 PM

Sounds like the WG flap may be permanently open or has no preload. You can just see the actuator from the top of the back of the engine. Have a look to see if it still has two nuts connected to either side of the rod first off.

**bn1986** · 24-06-2013, 02:58 PM

Originally Posted by VWindahouse

Sounds like the WG flap may be permanently open or has no preload. You can just see the actuator from the top of the back of the engine. Have a look to see if it still has two nuts connected to either side of the rod first off.

I'll have a look when i get home. But the thing is when the engine is cold, or driven from cold it spools fine. Its only once you've stopped the car for a few minutes (even sometimes in traffic) that the stupid turbo then stops spooling for a while, then comes back good.

If the WG flap was permanently open it wouldnt ever spool would it?

Also should mention, when the car is cold and i drive past vehicles on the drivers side as the turbo spools, it makes a clicking noise that gets faster with revs (sounds like sticky lifters) but a sharper, louder sound.

**VWindahouse** · 24-06-2013, 03:24 PM

Sorry my bad, I though you could never get it to spool so it's probably not the actuator. But that ticking noise is a worry. I say get it someone soon for a professional opinion.

**bn1986** · 24-06-2013, 03:35 PM

To me it sounds like (and dont hold me to it) like its either the n75 internals flapping around and vibrating as the ecu tries to regulate the boost, or its the actuator on the turbo, rattling around to the tune of the n75 directions. The N75 is ontop of the heads though, right?

Any tips on how to test the valve and see if its kaput?

**VWindahouse** · 24-06-2013, 03:56 PM

Yep the back of the engine and coming off the bend on the TIP.

You can just disconnect the plug and go for a run and see if there is any noise I guess.