V40 direct injection gdi . rich running & lumpy idle

The car computer adjusts the idle

Check to see if there is an AIR Idle Control Valve
at base of throttle body-- that you can remove & clean

I'm not a Euro guy sorry

Try You Tube Video & put in your veh & question

I have the same problem in my car volvo v40 1.6. A mechanic told me that this noise did VVT Pulley and should be changed.

Yes, having no thermostat can cause the car to run fast as it will still be set in it's "warm up" mode and will be injecting a richer mixture of fuel/air into the cylinders. There may be an additional cold start injector that just works while the engine is cold. You will probably use more fuel like this. It's not a great idea to run with no thermostat anyway because you get uneven hot and cold spots around the engine which is bad for it. Cheers

Still think ot vacuum related .This will push the revs up sky high .Get a good cigar and pulloff a vacum pipe .Take a good puff on the cigar now puff the emoke down the vaccum pipe .Now do you know what your looking for .You got it ,,, smoke ,,,,than you have found the leak.Thats if you have one ..Can you get a obd check it will tell you what it is ..Thermostat removal wont change the engine revs

It is most likely to be the throttle housing and idle control valve that needs a good clean, Gdi's are prone to coking up and cleaning these parts usually solves idling problems!

agree, idle control valve is a stretch. I would check the EGR valve for proper operation and clean the hoses if they are dirty. If not that, maybe the MAP sensor is off. Does it cut out when you open the throttle or even when you just stop at the intersection?

hi the MAF is more than likley to produce the wrong fuel to air mix, all the lamda realy does is keep an eye on the burnt fuel deposites and then sends the signal back to the ecu, which in turn then opens or closes the mixture , but if it is sending the correct signal and the MAF is not reading it right this will in turn cause your system to run either lean or rich, it may actually not be faulty as such , as it is still working according to the ecu so you wont get any error codes hope that helps sorta

oxygen sensors are most likely clogged up replacing them is usually the only fix

consulted Volvo agency and problem solved.

THE GDI ENGINE SUFFERS FROM EXTREME "COKING" - DEPOSITS THAT STICK AROUND THE VALVES AND PREVENT PROPER OPERATION, RESULTING IN POWER LOSS. REPAIR CAN BE EXTENSIVE AND COSTLY ESPECIALY IF YOU START TO HEAR A RATTLE ON IDLE. THE FIRST STEP I WOULD SUGGEST IS, TRY USING FUEL ADDITIVES SUCH AS WURTH FUEL/GAS/VALVE TREATMENT THESE ADDITIVES ARE QUITE CAPABLE OF CLEARING OR CLEANING CONTAMINATED PARTS IN TIME.