Black smoke with Sluggish acceleration in low gears
 

:thinking:
Hi All
Very confused defect occurring and wondering if anybody else has had same defect occurring ?
S40 2.0D no dpf 2005 D4204T. new egr, throttle body cleaned.
No warning lights illuminated. starts ok but with a definitive thump like an explosive detonation, mpg showing appx 50 mpg and sluggish acceleration when putting foot down, in 3rd-to 5 th gears with black/unburnt smoke being emitted(fairly big clouds of it as well) with the very occasional jerk/hesitation haven't got an obd2 reader but will get one once I work out the best/cheapest to get.
very grateful for any suggestions, my thought process so far is 1) vacuum hoses 2) map sensor 3) maf sensor 4) injectors 5) turbo ?

best regards David

Have you checked all turbo hoses? When you cleaned throttle body did you check Map sensor hole not plugged? Black smoke is too much fuel to air ratio so therefore check for boost air leaks. Hate to say but on mine turned out to be turbo and I had to replace it.

Hi. I’m going to have a good look around the engine bay over the next couple of days and I’m embarrassed to say that I didn’t check it wasn’t blocked when I cleaned the throttle, I’ll add that to the list. Thanks for your info, much appreciated

No problem. Don't forget to check all small vacuum hoses especially to turbo control valve. You could maybe do me a favour while you looking around and see where engine coolant temperature sensor connector wires run to? Sensor hidden behind oil filling pipe at the side of thermostat housing where top coolant hose enters. My sensor yellow in colour with black connector and two wires. Found my connector on the under tray with two broken wires attached. I don't know where it attached to wiring loom. I did an earlier post on it. If I can help any more let me know.

Brilliant, thanks for the help, I’ll report back when I’ve rooted about in the bay.
Cheers David

Hi All, after having a good look around the engine, I’m unable to find any hoses with cracks or not where they’re supposed to be, no wiring issues that I can see, I recleaned the two sensors on the inlet manifold which were a bit gunky.
I did notice however that my fuel air line after the filter had a large bubble in it and when I started it, there were lots of small bubbles coming through,
I bled and primed the system and got rid of those as far as I can see(used the Volvo pump) she seems to be quieter and with more acceleration through the gears, she still smokes on hard acceleration but is that left over remnants and could the cause have been that simple ?

Cheers David

Try blanking the egr and unplugging it. It shouldn't throw an engine light as long as its unplugged ( grey connector). Might just need a bit of an Italian tune up if its been plodding around town for too long without a good thrash!

Thanks, I’ll give it a good old Italian tune up, the unplugging of the egr made no difference so I’m guessing maybe an injector starting to go, I’ll get the codes read and post back

hi
ive had the air bubbles in fuel line and it can play havock with engine running on mine it turned out to be the connector going into fuel filter housing see attached pic . might be worth a check as its not obvious where air is getting in

Update or maybe not.......
 

Well, after some digging around I managed to get a icarsoftbi906 specific to Volvo and Saab handheald reader in order to read the codes, my local Indy couldn’t get a connection and I really don’t want to go anywhere near Volvo unless I have to.
The reader picks up the car, vin number, reads elec faults when headlight bulbs have failed and even the fuel pressure and batt volts when running but absolutely cannot connect to the écu, gives me a “cannot connect to écu” message, is this something that in your experience can be reset or fixed or is it completely knackered and needs a replacement please .?

Many thanks

David