Hi folks. My 2007 2.5L XC70 has 145,000 miles on it and generally runs great. It now fairly consistently (though not always) fails to start if it's below around 20F, especially after sitting all night. This used to be more intermittent, and has been getting worse.

It turns over fine regardless of the temperature and I have recently had the battery checked. When it fails, it typically doesn't fire at all or fires very infrequently during cranking. Sometimes when it's cranking away it starts all of a sudden and immediately runs smoothy. I believe I can smell the signs of extra gasoline (rich) in the exhaust in those cases, as I'm backing out of the driveway.

Any thoughts? As I think is obvious, I'm thinking spark or gas, but I don't know this car well, and I've never seen a failure quite like this.

Thanks,
Will

 

have you tried to measure the fuel pressure at the rail? scan for any codes?