Power Loss... Turbo?

[Wentworth]

Hi all,

yesterday driving home at high speed I suddenly felt a loss of power, speed dropped and so did the turbo boost gauge.

I pulled the car over and looked aunder the bonnet. All was very hot, but no obvious signs of anything amiss. After a minute I revved the engine slightly and saw that the turbo gauge was responding again.

I drove the car home gently, but there didnt seem to be any noticeable after effects. I've had the car for over a year with no previous issues like this. It was being driven fairly hard at the time.
Any ideas whats caused this? I'm taking the car to France next week and don't want any issues on that journey!

Thanks in advance.

Could be a an air leak. Simple thing to do is to check all the hoses to and from the turbo. They crack with age and the tiniest hole could upset the turbo.

George

[link:www.ttsservices.co.uk/my%20volvos.htm|http://www.ttsservices.co.uk/Signature.JPG]

'95 940 Polar LPT estate (B230FK/AW71)
'87 740 GLE Turbo Diesel Intercooler estate (D24TIC/ZF22)
'79 262C (B27E/BW55)

[Grizlyadams]

Note he said driving home at high speed. bet you its a simple case of the intercooler not passing enough cold air into the engine and the engine loosing power due to the hot air, after all the colder the intake temp on a turbo engine the more power you will get. Either drive slower (sod that) or shove a bigger i/c in there! also a cold air feed to the airbox might be a good idea,

Griz

Although in theory you could of course be correct, I still wonder. I mean, how fast and hard was he driving? I have driven my car in serious heat, above 35 degress in the shade, on the Autobahn in Germany at 180 kph and had no such problems. Perhaps his IC is in fact damaged. Of course the theory is indeed correct. The first thing they do to these cars when they go in for the 250+ bhp in Sweden is replace the IC.

George

[link:www.ttsservices.co.uk/my%20volvos.htm|http://www.ttsservices.co.uk/Signature.JPG]

'95 940 Polar LPT estate (B230FK/AW71)
'87 740 GLE Turbo Diesel Intercooler estate (D24TIC/ZF22)
'79 262C (B27E/BW55)

[Wentworth]

George, Grizzlyadams,

Sheepish Admission>>>>>>>>

I had a look at the large turbo inlet pipe this morning. I worked out that the "duck tape" wrapped around it probably wasn't an original Volvo fitting!

Doh! I haven't picked it apart, but it can only have been put on for one reason.

Have ordered a new one from my local dealer, should be in tomorrow at circa £50.

Thanks for the help!

I was interested in the comments about the intercooler.... what and where is it?

[Grizlyadams]

Do you mean what to replace it with? or where it is on the car?
the I/C's in front of the radiator, having a hose from the turbo going into it, and the hoes going out into the intake manifold. As to what to replace it with, 3 options, custom (lots of money) or izzuz NPR intercooler (from a small truck) or a ford powerstroke (huge thing, will need to cut up car to make it fit, from a derv ford pickup in the USA), im looking out for an NPR, unless one from a volvo truck can be made to fit!

Griz

[Peter Milnes]

For what it is worth the Volvo Intercooler is acknowledged to be one of the best around. Unless you are going in for a big horses boost to your engine, it is not necessary to change the intercooler. In fact the Turbobricks guys never change the intercooler for mild power increases up to 230bhp.

All the best, Peter

[Grizlyadams]

>
>For what it is worth the Volvo Intercooler is acknowledged to
>be one of the best around. Unless you are going in for a big
>horses boost to your engine, it is not necessary to change the
>intercooler. In fact the Turbobricks guys never change the
>intercooler for mild power increases up to 230bhp.
>
>All the best, Peter

Yep the intercooler is a good one, very big, flows quite alot. Pointless changing the IC unless as you say, after big horses....which i am :-)

Griz

[Wentworth]

Thanks to everyone for the advice. I fitted the new hose from the airbox to the turbo intake. The old one was "repaired" underneath the join from the breather pipe(?). It had a deposit of oil at the junction and seems to have rotted out before Mr Duck tape got to work.

Paul.

[ivor940]

The same duct was taped up on my 940 2.0 turbo (140k at the time). It looked like oil vapours from the breather system had made the duct soft, and it finally failed. The Lambda light was also on (MAF signal failure). I replaced duct (from Braydon) and also replaced breather box below inlet manifold and the plastic pipe over the engine which was broken in half ( with a temp repair). All the breather system had carboned lining 1/8 th inch thick.

ps Car went great on 1000 mile holiday to Yorkshire, 5 people and luggage did 29.5 mpg. Great on motorways :)

94 940 2.0 SE Turbo estate 5 spd 143k

VOC member