Volvo 940 TD Auto - Turbo Probs

I'm not very familiar with the diesel turbos, but it sounds like your boost is going too high, you should look at the wastegate and whatever controls it in that car, is it a simple pneumatic solenoid, or does it have electronic control?

Left unresolved this will quickly toast your turbo as it did mine.

Also from my experience, if the mecahnic says, "That just happens sometimes. Sometimes the Turbo runs into the red and the turbo light comes on" then he's an idiot and a liar and you shouldn't trust him

Been there, paid that.

blurp.

On Mon, 27 Oct 2003 18:41:41 GMT, the illustrious "James Sweet" favored us with the following prose:

Well, actually on a 240 Turbo that originally wasn't intercooled had a gauge with a red section that the needle would go into when the intercooler kit was installed. This would also turn the light on, part of the intercooler kit installation was removing the turbo warning light on the dash.

Yeah but that's different, that's a modification that allows you to run higher boost. The factory intercooled models had a different boost guage with a larger yellow section and no connection for the warning light. Of course even with that guage mine goes into the red :)

Still it's different with a gasoline engine than a diesel, turning up the boost on a gas (petrol) engine gives more power provided the fuel system can keep up, on a diesel you have to turn up the fuel to match whatever boost you're running.

Speaking of 940 Turbodiesels there is only one reason why the light comes on. There is no gauge so the guy cannot truthfully say that the turbo runs into the red. So the problem is that the engine is tricked into either overboost or into thinking that an overboost condition has been achieved. If there is no EGR, then there is just one overboost switch which operates if there is excessive manifold pressure to put the light on. If the wastegate operating arm is sticking in the closed position then overboost can be readily achieved. So check the small pipe from the turbo output to the small pressure actuator. It may be split or punctured or even missing, or the actuator may well have seized.

Cheers, Peter.

: > Left unresolved this will quickly toast your turbo as it did mine. : >

: > Also from my experience, if the mecahnic says, "That just happens : > sometimes. Sometimes the Turbo runs into the red and the turbo light : > comes on" then he's an idiot and a liar and you shouldn't trust him : >

: > Been there, paid that. : >

: > blurp. : >

: : Well, actually on a 240 Turbo that originally wasn't intercooled had a : gauge with a red section that the needle would go into when the : intercooler kit was installed. This would also turn the light on, part : of the intercooler kit installation was removing the turbo warning light : on the dash. : : -- : Mike F. : Thornhill (near Toronto), Ont. : : Change cant to ca and remove parentheses to email me directly.

I was speaking specifically to blurp, who I know from past posts has a

240 Turbo that my statements would apply directly to. He's had some problems with his mechanic who he feels has mislead him, so I was just pointing out that maybe he's not being mislead with this overboost statement.

None of this applies to a Volvo turbo diesel.

Don't worry Mike, I wasn't referring to your message to blurp. I was answering the first poster as he said it was about a 940 TD. Having got one myself, and what a very good machine it is too, I thought I could throw some light on his problem. I should have made it clearer and for that I am sorry.

Cheers, Peter.

: > > >

: > >

: > > Well, actually on a 240 Turbo that originally wasn't intercooled had a : > > gauge with a red section that the needle would go into when the : > > intercooler kit was installed. This would also turn the light on, part : > > of the intercooler kit installation was removing the turbo warning light : > > on the dash. : > >

: > > -- : >

: > Yeah but that's different, that's a modification that allows you to run : > higher boost. The factory intercooled models had a different boost guage : > with a larger yellow section and no connection for the warning light. Of : > course even with that guage mine goes into the red :) : >

: > Still it's different with a gasoline engine than a diesel, turning up the : > boost on a gas (petrol) engine gives more power provided the fuel system can : > keep up, on a diesel you have to turn up the fuel to match whatever boost : > you're running. : : I was speaking specifically to blurp, who I know from past posts has a : 240 Turbo that my statements would apply directly to. He's had some : problems with his mechanic who he feels has mislead him, so I was just : pointing out that maybe he's not being mislead with this overboost : statement. : : None of this applies to a Volvo turbo diesel. : : -- : Mike F. : Thornhill (near Toronto), Ont. : : Change cant to ca and remove parentheses to email me directly.