Smoking V70 D5 2001

Shocktube14 · Post by **Shocktube14** » 19 Nov 2010, 09:06

Hi Members.

Can anyone help?
I have a pretty good condition V70 D5 with 220000 miles on the clock and lots of service history.

My problem is the car blows thick black smoke during hard acceleration.

When driving normally at 60-70 MPH I get a small amount of grey smoke.

I read somewhere that it could be one of the following.

1) Soft intercooler hoses causing a restriction of air to the Turbo?

2) A split or leaking intercooler?

3) Turbo oil seal damaged or leaking?

Can anyone shed some light on my problem? or suggest a possible remedy?

The car drives really well and is silky smooth but I can't use the car properly due to the black smoke.

Cheers.

Richard (Southampton) UK.

Post by **jblackburn** » 19 Nov 2010, 09:11

My first step would be to remove the intake hose to the turbocharger and check for shaft play in the turbo itself. You can also check the intercooler hose (the one that goes up and over the top of the engine) and check for excessive oil in the pipe.

Shocktube14 · Post by **Shocktube14** » 19 Nov 2010, 09:16

I do have a small amount of oil along the bottom edge of the intercooler, whould this point to a faulty Turbo oil seal and would this cause the black smoke?

Post by **jblackburn** » 19 Nov 2010, 09:19

That is normal to an extent - there is a weep hole in the bottom of the intercooler as SOME oil will make it past the turbo seals, and the splash shields on all of the turbo cars are a little bit messy there. However, if the inside of your pipes is just wet with oil, it is a cause for concern - in that your turbo may need new seals and/or one of your hoses is sucking shut and causing it to run rich.

Shocktube14 · Post by **Shocktube14** » 19 Nov 2010, 09:32

Thanks for your great reply jablackburn, I shall have a look tomorrow, it is puzzling as it goes well.
I have noticed it uses quite a lot of fuel.
The air filter really needs changing, also would an old fuel filter also lead to black smoke?

Post by **jblackburn** » 19 Nov 2010, 09:40

I have noticed it uses quite a lot of fuel.
The air filter really needs changing, also would an old fuel filter also lead to black smoke

No, but a bad mass airflow sensor could.

Shocktube14 · Post by **Shocktube14** » 19 Nov 2010, 09:46

Oh, is there a way of telling if its bad?
I checked the intercooler pipes and they seem pretty soft and easily pinched together.

Retired MVS Contributor · Post by **Retired MVS Contributor** » 19 Nov 2010, 10:17

D5!...Isn't this car a diesel?...If so, we have a different set of circumstances...First off, oil, even in a petrol engine, burns with white smoke, not black...Black smoke in any engine, diesel or petrol, indicates an over rich condition and unburned fuel is leaving by way of the exhaust in a sooty cloud...In a diesel the most likely cause is leaking injectors...

Jerry

Shocktube14 · Post by **Shocktube14** » 19 Nov 2010, 10:20

Hi Jerry.

Yes D5 diesel 2.4

Can you give me any more info on this?
Leaking or blocked?

Is there a way of checking this?

Post by **jblackburn** » 19 Nov 2010, 10:32

He mentioned the grey-ish smoke as well, which could be oil that is NOT being burned in the engine (which would be blue) but rather from the hot side of the turbo leaking into the exhaust.

But then he later mentioned the excessive fuel consumption.

We don't have the diesel versions over here, but generally you can unplug the mass airflow sensors on the gas engines. If the idle/black smoke smooths out, that means the sensor is giving an incorrect reading and dumping too much fuel into the engine.

Vacuum leaks can cause over-rich conditions as well, leaky injectors, or a terribly clogged air filter/leak in the turbo hoses.

I'm not sure what other sensors there are in a diesel engine, but I can try to take a look through VADIS for you when I get home.