MK5 Golf GTI
All Things Mk5 => How to Guides / Troubleshooting => Topic started by: Pullafacial on May 24, 2010, 06:50:18 pm
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Hi guys, not sure if it's a problem or not but on the way to work today I noticed the following:
Whilst I had the window down under hard acceleration, the "whistle" noise from the turbo seems to gradually get louder then gets to certain point (around 3000 revs) and then suddenly drops right back.
It's almost as if it gets to a certain point then looses pressure or goes into safe mode or something??
Anyone experienced this before? Maybe that it's normal but i'm just curious.
Steve
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All gears? Mine does this in 2nd under normal acceleration, foot down hard and it struggles for grip. 3rd gear upwards it pulls all the way and whistles like mad :driver:
Remapped?
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Happens in all gears and not remapped (although thinking about it!)
Steve
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But it still pulls as strong when the noise dies down?
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What turbo is it.?? k03 or K04.
K04 is alot more audible especially on throttle lift off.
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Still pulls but not as strong as when the whistle is louder.
Never been in another one so have nothing to compare it too.
Not sure what turbo, is there a way for a simpleton to tell?
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Do you have the standard GTI (K03) or the 30th anniversary edition (K04) ?
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Standard Gti so guess K03
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Hi guys, convinced myself I have a split DV so as I've only had the car a couple of weeks I'm gonna get it booked in at the garage. My only concern is it's not a main dealer but a general car sales place so hope it's covered!
Just a bit info on the fault, it's definately lacking power and the turbo whistle is really loud.
Also, seems to be worse under hard acceleration as a pose to gentle.
Thanks for your help so far and I'll keep you posted.....
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Hi guys, convinced myself I have a split DV so as I've only had the car a couple of weeks I'm gonna get it booked in at the garage. My only concern is it's not a main dealer but a general car sales place so hope it's covered!
Just a bit info on the fault, it's definately lacking power and the turbo whistle is really loud.
Also, seems to be worse under hard acceleration as a pose to gentle.
Thanks for your help so far and I'll keep you posted.....
Sure does sound like a split DV. :smiley:
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That's what I thought, on a positive note, seem to be getting 5 miles per gallon more since the problem started!
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Whereabouts are you Pullafacial?
Its an easy job to swap the DV, about 4 bolts and a plug and your done.
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Hi Pazz, I'm in north Norfolk. Been searching for a guide for replacement but can't find one.
Is it easy to get to or does the car have to go up on ramps?
Steve
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what's a dv?
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From what I gather, dv stands for dump valve which is the component that disposes of used air from the turbo.
I could be wrong but I've put 2 and 2 together and that what I've come up with!
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Its the diverter valve, basically does what a dump valve does, releases boost preesure on closed throttle :smiley:
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My s3 whistles in fifth gear only at a specific rpm. Is this that noise?
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Don't think so shamrock. All seems fine driving at constant speed.
Problem is when I floor it, it picks up strong for a split second then the turbo whistle turns in to a noise like escaping air and power is immediatley down.
Anyone know if I can pop the dv out without getting the car on ramps?
Steve
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Don't think so shamrock. All seems fine driving at constant speed.
Problem is when I floor it, it picks up strong for a split second then the turbo whistle turns in to a noise like escaping air and power is immediatley down.
Anyone know if I can pop the dv out without getting the car on ramps?
Steve
not on a regular GTI, you really need it on axle stands at least as its bolted directly to the turbo
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Just booked it in for next week at the garage I bought it from to have a look and investigate a wheel bearing noise as well.
Also, just booked getting my seriously scuffed 18" Monzas in for a "black" makeover aswell.
Can't wait to see the results.
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Quick update - Took the car in first thing this morning to get sorted.
Just recieved a call to ask if they could keep the car over night as proving a bit more in depth.
Hopefully will know the outcome tommorow!
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what's a dv?
Diverter valve :happy2:
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Well, got the car back today and have a feeling this is gonna take take some sorting!
The garage found a slightly loose pipe which they thought had fixed it but still the same. It just feels really flat and sounds like pressure is leaking before the foot comes of the throttle. garage have said to bring it back and they'll have another look trouble is they're 20 miles away and only open when i'm at work.
They have also established that the wheel bearing noise is infact tyres. they've changed them onto the front but i'm trying to get them to sort it as it drives me mad!
Anyone got any ideas as to what the problem could be? After much reading on here i'd convinced myself it's the DV.
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Some simple vcds logging will confirm if it's a boost leak, and then Replacing the DV is a sensible next step if all the hoses have been checked.
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Sorry to bump an old thread, but a colleague (with a stock Edition 30) is having a whistling noise but only on tickover, and not from cold. The whistle goes away on boost and not apparent on cold starts. Any thoughts? Suspect the DV is not to blame in this case due to when the whistling is occurring. :surprised:
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Check the PCV valve as they can create a whistling noise and also lose you power when the check valves inside break.
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Check the PCV valve as they can create a whistling noise and also lose you power when the check valves inside break.
Also hear a hissing sound after shutdown coming from under the top engine cover if the main diaphragm has blown.