BigMo

Finally got all the vacuum hoses done and.....

37 posts in this topic

....it would appear the turbo is knackered. Changed all the vacuum hoses and the reservoir tank going to the turbo and for the first time I could see the turbo actuator move. However once I left the garage I drove away and I could hear the turbo whistle/whine, it's terrible like a constant whistle between 1500 and 3000 rpm. Not sure if blanking my EGR has added to it. So far this car owes me £3K and it still needed another £1K to sort out the paint, gearbox service and other bits. It now looks like it will need a recon turbo and a few suspension parts and it's beginning to get to that point where I may just have to cut my losses. What a day!

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Why do you think the turbo is shot? A VNT turbo will whistle most the way through the Rev range, it's constantly making boost, if you put your foot on the floor from 1500rpm the turbo will make near on full boost up until it runs out of puff.

If the car is smoking or the turbo is making a whining/siren noise as the turbo rubs against the housing then that's a sign of it being knackered, the best way to check would be checking the turbo end float whitch can easily be done with the turbo inlet hose off.

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Oh no

You must be gutted

What a pain sorry

I am a little gutted no doubt as I really wanted this car sorted and have wanted an e39 for about 10 years. Guess it's just one of those things really, no point getting annoyed.

Mo

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Why do you think the turbo is shot? A VNT turbo will whistle most the way through the Rev range, it's constantly making boost, if you put your foot on the floor from 1500rpm the turbo will make near on full boost up until it runs out of puff.

If the car is smoking or the turbo is making a whining/siren noise as the turbo rubs against the housing then that's a sign of it being knackered, the best way to check would be checking the turbo end float whitch can easily be done with the turbo inlet hose off.

The car does let out a puff of black smoke on initial boost but not after that. It's the noise that's crazy. Doesn't sound like anything rubbing or scrapping but it's like a jet taking off. I will try and upload a video on youtube. Another thing is that it's alot less noticeable when the car is stationary and being revved. Annoyingly the turbo was changed by a previous owner less then 45,000 miles ago for a brand new Garrett unit at the cost of over £1800!

It was once I connected the hose coming out from the reservoir tank and into the top nipple of the boost sensor that the noise started. Also I have noticed a slight trace of oil when I disconnected the big silver pipe (not sure what this is called)

Mo

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It sounds perfectly fine to me Mo, my Passat used to sound like a jet too, I used to love that forced induction noise :)

Is it noticeably quickly lower down the Rev range?

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I swapped to a decat pipe a year or so ago and the turbo now "howls" when giving it the boot (especially uphill with the caravan on the back!!)

Nothing wrong with it, just took a bit of getting used to.

I'm no specialist - leave that to the pros on here - but I would be surprised if the turbo is actually foo-barred.....

....but I feel your pain.

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Have a listen gents, the videos ain't great but give an idea of the sound. Also you can hear how different the sound is when the car is in motion.

Appreciate the supportive attitude which is more then I've had from my family!

I love the community spirit on this forum.

Mo

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That doesn't sound anything like mine I have to say? Is the aux fan ok and working correctly?

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The aux fan seems to be ok, I had a fault code for the aux water pump not sure if there linked? And yes it's a standard exhaust.

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It only does this once the vacuum hoses are all plugged in. If I disconnect the hose from the reservoir tank to the boost control it goes away completely but then so does the power.

Mo

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Would there be a split in your inlet manifold ?

These are plastic aren't they ?

I had one go a few years ago on an e39 525d on me. Nasty sound then and I was sure it was curtains for the turbo but it was just the manny.

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Thanks for the reply, I can double check that. Although when I had it off about a week ago it looked all ok. Any ideas on where it's more likely to go?

Mo

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splits along the seam usually adjacent to the oil filter housing.

I think.

It's been about 6 years since my old 525d done that.

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What do I need to remove in order to get access to this? I have huge hands and it's such a pain trying to get around the smaller areas on a car.

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Remove the hose from the airbox to the turbo and move anything else out the way and that's it, once you see the impeller of the turbo you just have to wiggle it about and see how it moves, in an ideal world it shouldn't move, but it reality it'll move up and down and side to side a little bit, in and out is the one to be looking for, i'v had turbos that will move in and out a bit and still fine but it's a very fine line what's ok and what isn't, your car sounds unusually deep for a standard exhaust, the turbo does sound loud but it just sounds loud not broken, sometimes a turbo can become noisey if it's had foreign objects inside it and chewed the blades up a little.

I'd also be inspecting exhaust and inlet pipe work, you might find something is loose.

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sounds like broken flexi on exhaust as well as boost leak. turbo spools up correctly I'd be surprised if it's duffed. what I normally do if I can't locate leak is spray water with soap/washing up liquid all over pipes and inlet and look for bubbles :-)

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sounds ok mate

yes it will be louder under load... you cant make real boost without driving the car/loading the engine up, i wouldn't be replacing the turbo yet...

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Mine sounds like I've got an ambulance chasing me, but the power is spot-on and I don't think for a minute that the turbo is knackered. It's done it ever since I fitted new vac pipes and got the turbo working as it should when I had it re-mapped.

Don't spend money on a new turbo, just get used to the sound of boost!

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Gents thanks for your replies, I actually removed the swirl flaps on another car yesterday and then took that for a drive. That was the same car as mine and I felt his turbo was near silent although my car felt like the better drive in terms of ride quality. After sorting out the other car I changed the vacuum tank on mine for one I got from eBay and realised that the pipe that comes out the other side of the tank and goes to the boost control was hanging off. So I changed this as it was perished and put it all back together. I started the car and gave it a little gas and I could hear a little whine whih actually made me happy as the turbo was finally working. It was only when I took it for a drive that I realised it sounded like a jet plane. Don't get me wrong it turns heads when you boot it but it's definately a lot louder then normal. I may reinstall the Egr as I have heard removing this exaggerates the turbo sound.

Mo

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Also will drive it to work in the morning and hopefully have a fiddle there to check the turbo and hoses as I have a well lit car park at work. I did want to take a look at it today but I decided to have a day where I just leave the car alone. I can't stress enough how much I appreciate all the help and advice I'm getting.

Mo

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