Get some Carburettor cleaner spray from an auto center.
Take the pipe off into the air filter unit attached to the Carburettor it normally has a large ring clip around the black pipe so you may be able to use a slot screwdriver or a small ratched driver to remove.
Put a small piece of cloth into the carburettor unit to stop too much contamination going back into the system . Use a cloth or paper towel to wipe off any excess oil inside the carburettor. Spray the carburettor cleaner inside the unit , Using an old Tootchbrush give it a rub to degrease the old oil and fuel. Be careful to Open up the open and closing circular small valve spray a little bit of cleanir inside and using a long piece of cloth clean any contaminated area inside the carburettor.
Dont ruch this and get as much old oil and grease from inside the carburettor as you can. Taking care to remove all the bits of cloth and paper tissue . .
Start the car up with the Carburettor still open to the world.
With the car running and the Carburettor opening and closing spray a little more of the cleaner using the straw in the nozzle into the inside , please make sure you are standing to the side so nothing comes back out into your eyes.
With the carburettor now much cleaner . Put the air pipes back on and take it for a run . At your next fill up of fuel put in a fuel addative for Engine System cleaning and this should help with the emissions.
Some of the Volvos went from actual cabled units to electronic units on the accelerator pedals on the Volvo cars. It may simply be worn and needs replacing. Youi will need to write down the number of the side of the unit on the pedal all the way under the footpedal. Easier to put a mobile phone or camera under and take a photo. You will need to get the same part numbered pedal.
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