I've seen 225 60 16 on some xc70s.

I am looking for new tires on for my 2003 XC70. I would like a little softer ride than on the stock 215 65 16. Any suggestions on upsizing while keeping the 16" rim?

I put a new front o2 sensor on and it passed, but now the HC levels are high at 15mph it was 51 (max is 52) at it was 32 (max is 36) , Any idea how to bring the HC levels down. May NO levels want down to 365 form 504 at 15mph(max is 424)

I will be replaceing the fuel pressure regulator next.

All ...

I just want to confirm what part this is. It looks to be a fuel pressure reguator, it's just down stream of the fuel filter attached to the fuel line, it has a sepperate line going to the gas tank and a vac line that is attached to a line going to the charcoal filter.

http://www.flickr.com/photos ...

i just discovered a hiss coming from the fuel pressure regulator. woul that have anything to do with this problem?

any idea where the charcoal canistar is located on my 850?

btw thanks, that shop is the next city over. I'll try them monday.

Bill,

I don't remember them having a fan during the test.
The temp gauge is always a little above center, which seems a little high. I will check thermastat.

sit22II,

I dont know of any vac leaks. I just got a P0442 for the evap system, there might be a leak there. I don't know if that would ...

My 850 doesn't have an egr valve. Any other ideas?

I just fail a smog check in California, my 97 850 has about 300,000 miles on it. It runs great with no check engine light. I did get a code a few moths ago for evap system. Will that effect NO levels? My levels at 15mph where 506 the max is 424, After decarbonizing it went down to 496, in addition ...