All Things Mk5 > How to Guides / Troubleshooting

annoying squeal/squeak on a 06 plate Gti

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fliprio:
I have pinned it down this afternoon to it happening every time I lift of the throttle sharply once its up to temperature, it them gives a chirp and goes away.

PCV valve?

fliprio:

--- Quote from: lukemk5gti on July 09, 2016, 04:04:56 pm ---Could be a lightly sticking caliper

--- End quote ---

I rebuilt both front calipers yesterday afternoon as that was my first thought, but no its still making the noise!

fliprio:
out driving this evening, although it happens generally above a certain RPM the squeak isn't road speed related - same pitch at different road-speeds and happens at different RPMs, but usually when letting off.

When I had the bonnet up this morning doing the test on the PCV valve by taking the oil cap off it did the usual rough running like it should but then I could hear an escape of air when the engine was turned off, not a squeak but you could hear something depressuring itself.

ChazGTI:

--- Quote from: fliprio on July 09, 2016, 10:25:38 pm ---out driving this evening, although it happens generally above a certain RPM the squeak isn't road speed related - same pitch at different road-speeds and happens at different RPMs, but usually when letting off.

When I had the bonnet up this morning doing the test on the PCV valve by taking the oil cap off it did the usual rough running like it should but then I could hear an escape of air when the engine was turned off, not a squeak but you could hear something depressuring itself.

--- End quote ---

Try and get a video of this? It sounds like you're experiencing a problem that would be picked up by the ECU. Do you have access to VCDS/VAGCOM?

fliprio:
It looks like a new PCV valve has cured the main squeal noise, the check valve in it looked a bit stuck, its also helped the cold start idle as well.

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