My 06 XC90 was surging, searched the net trying to find solutions with no luck. My friend bought an 06 XC90 from Clayton's in Knoxville and it started surging right after he purchased it. Neither would throw a code. He took back to dealer and they fixed it for him at no charge (Way to go Claytons, good customer service). I asked him to find out what they did to it. He shot me a copy of the receipt and it listed some of the PVC system hoses being replaced and cleaning the throttle body.

Since I had just cleaned and sealed my pvc hoses and no improvement I figured to try the throttle body. Took it out. Pretty easy from the bottom with a couple of 1/4 inch drive extensions and a deep well socket.

It only had a little carbon build up on one side and I thought this was a waste. Took my time and cleaned ALL the carbon out. Carb cleaner and maybe 15 minutes. Looked good as new when I put it back in. Started it and purred like a kitten!!!! I could not believe that little amount of build up was causing it to surge like that.

Have a 2001 V70 T5 that was also surging. Dropped and cleaned the throttle body. This time total job only took about an hour. Little carbon. Clean and now purrs like a kitten! If you haven't already, clean the throttle body. Two for two for me.

good luck.

Keith
1996 855 345K sold. 1999 S70 T5 Sold (this car would fly) 2003 S60 2.4T sold, 2001 V70 T5 170K, 2006 XC90 170K.