My 2007 V70 XC with 146K miles. Car vibrates a little in city traffic all the time now. Vibrates heavily when accelerating out from a stop to highway speeds, and mildly when at highway speed. Just had both front axles replaced, but no apparent improvement. Also replaced one ball joint. Latest mechan...

I think we found the misfire problem - oil collecting under plastic valve cover rotted wires to coils. Oil cap gasket leaked. Now replaced everything and running well.
Thanks for all the advice!

Thanks. Never would have thought this was related to an axle. Have replaced both in last year, but could have gotten a bad one I suppose. Frustrating.

Original poster, are you saying the car misses only at 70mph/highway speed, while it never does so at lower/town speeds? Yes. It takes awhile - maybe 30 minutes or more of highway cruising before it does this. Only notice it when on a trip. Short bursts of highway speed don't cause any misfires. So...

Many thanks for the tip. I will add that to the long checklist!

Do the easy stuff first: (Inspect intake air hoses for splits, plugs, MAF cleaner spray, ETM cleaning (if necessary), fuel filter). Add a 20 oz. bottle of Techron concentrate before a stint of local driving. After that, jump on it and try to get it to throw a code. Thanks! Hoping it is a simple maf...

chrism wrote: ↑31 Aug 2017, 16:06 My wife's 2005 S80 2.5T is starting to do the exact same thing - slowly getting worse. I think I'm going to pop a new set of plugs in it as the ones in there now have about 90,000 miles on them. Keep us posted as to what steps you take in solving the issue.

Will do, thx!

My 2007 XC70 runs fine most of the time. Has 145k on it - always maintained. When cold, will accelerate to highway speed, no misses, but after cruising smoothly for awhile at 70 mph, any increase of speed, no matter how gentle, causes engine to miss and car to buck hard. Gas mileage is stable, and d...