Author Topic: GTI experts? Car has loss of power and horrible noise at high revs  (Read 140 times)

Offline Rossmk5gti

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My car has the following symptoms and no codes:

Loss of power, still boosts however power goes dead at 4000rpm plus

Noise from the engine bay which gets louder as revs increase, sounds like a diesel being revved hard

Whilsting noise that sounds like a siren occasional (usually on startup)

I have brought the G revision of the diverter valve however im concerned about the horrible rattle when the car is revved hard, low down in the rev range the car performs fine with maybe a slight power loss.

Any help would be appreciated I am concerned the turbo may be on it's way out or the engine may have moved out of time.  :thinking:

Offline ady-gti

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Re: GTI experts? Car has loss of power and horrible noise at high revs
« Reply #1 on: July 13, 2018, 05:22:52 PM »
Exhaust cam chain possibly.. It will be worth changing the DV to see if it sorts the whistling, but the high end noise etc could well be the chain has stretched too much and skipped a tooth.

Offline Chesto18

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Re: GTI experts? Car has loss of power and horrible noise at high revs
« Reply #2 on: July 14, 2018, 08:53:41 AM »
Any engine management lights?

It sounds like you’re describing a mechanical sound, which I’d guess at a cam chain issue.
Could equally be a misfire if it’s holding back above 4K and you’re having a flashing engine light. Wouldn’t sound as you describe though.

Could be a turbo issue too, as it spools up with the increasing revs.

Doesn’t sound like the DV though.

Offline Rossmk5gti

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The more I drive it the more I think it's a turbo issue.

There are no lights on currently, I've noticed though the car has boost when I first start it up but the longer it's driven the flatter the power gets.