I HAVE AN 850R WHEN IVE DONE A LONG DRIVE I COME TO A STOP AT TRAFFIC LIGHTS MY CAR STARTS TO SMOKE FORM THE REAR PIPE BADLY DRIVE OFF THEN IT STOPS.
IT WILL ONLY DO THIS WHEN HOT,IT IS USING SOME OIL.

ALSO MY ENG CHECK LIGHT COMES ON AND OFF.

www.obd-2.com 122.00 USD.
you need a laptop or pc to connect it to.

i have one and it works great.

Dan

I'm not quite clear what you're asking. Are you getting smoke at idle? Or when you pull away (drive off), and then seems to clear up a few seconds later? How many miles/km on the engine?

Check engine light is usually (but not always) related to the emissions control systems such as EGR, fuel supply, air pump, 02 sensors, etc. You (or your mechanic) can scan for the codes and pinpoint the problem.
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(98 S70 T5SE misc mods, mostly lighting) (92 940GLE)

SMOKING WHEN IDLE,144000 MILES
DO YOU NO HOW I COULD GET CODE READER IN THE UK.

>SMOKING WHEN IDLE,144000 MILES
A couple things spring to mind, the first two less likely.
****First, blow-by (bad rings). Try a heavier weight of oil.
****Second, turbo rear seal. Symptom would be a little smoke at idle, but a bigger rush of smoke when you when step on the gas; it then seams to clear up.
****Third, emissions system failure, such as the flame trap. This seems likely as a fouled emissions sytem will often generate a 'check engine' code, and is consistent with the problem being worse after a hard highway run. A clogged flame trap will build up crankcase gases (hot, oily smoke) which will escape past the piston rings or the main engine seals looking for a way out. Start with this, as it's a cheap, DIY repair. Go to volvospeed.com to check out the procedure.

>DO YOU NO HOW I COULD GET CODE READER IN THE UK
Not exactly. You're looking for an OBD or OBD II reader (On-Board Diagnostics). IPD, a US company, sells one for $179US (http://www.ipdusa.com/ProductsList.aspx?subSubCategoryID=700). Do an internet search on OBD and see what comes up in the UK.
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(98 S70 T5SE misc mods, mostly lighting) (92 940GLE)