Surges and hesitates while driving. Changed the downstream O2 sensors already.
Check the cars codes first. as can be failing fuel pressure sensor. or throttle position sensor .
SOURCE: location of fuel filter on volvo s80 year 2000.
its under the engine on the side of the frame
SOURCE: Volvo S80 Error Code 014
That is a cam shaft issue. The reason that they say that it might be oil sludge is because of variable valve timing. That system uses oil pressure to vary the cam activity according to the driving conditions.
If you have done regular oil changes on the car, I doubt that it is a oil related issue. You can take it to some place like grease monkey and have the engine flushed to see if that helps. What they are going to do is similar to putting 50/50 oil and diesel fuel in and run it till it gets warm then drop the mix and put in real oil. This is a tough one to diagnose without a scope to check activity on the cam sensor. It could be a flat spot on the cam.
SOURCE: MAF needs cleaning 2000 volvo s80
My 2001 S80 was doing the same thing. I took it to the local Volvo dealer and they did a software upgrade at no charge. Purrs like a kitten now.
Pull starter and take it to auto store and test for free.
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