All, this is hardly the first time we've had problems with our 2009 XC70 T6. It's spent 64 days in the shop during it's warranty period (29 during the first year, just missing the lemon law by one day in our state). We bought it new from the dealer with 3 miles on it. The only engine/mechanical problem we've had is an oil induction hose that was leaking and replaced in the warranty period. All of the other warranty problems have been "convenience" problems.
For about two months now, in the morning, it has a slow start. It'll crank right away with the same amount of power as always, but take about 4-5 seconds to catch and start. During the warranty period, we had this happen, and brought it to the dealer, it stayed overnight, and they had no problem with it starting. No problem found, bring it back if it happens again. It never happened again.
Now it is having the problem...every morning...every day...out of warranty.
I made an audio clip and saved to my google drive. Here's the link:
https://drive.google.com/file/d/0B0Z...6bXVjSWh3UExZ/
One morning, it didn't catch the first time during this process, and the second push of the start button it started right away, but ran really rough for about 30 seconds, like sputtering. It has always started within 4-5 seconds of a single ignition button push.
It did have a 600CCA battery installed, and didn't help this lazy start problem.
When started again on the same day, it has no problem. Sitting overnight for about 14 hours is when it has the problem in the morning. We're about 20%-50% RH during the year, and at 6034ft in altitude if that helps at all. Ambient temperature is about 65-70 at night, and is a garaged car.
I've read other postings with somewhat similar problems, regarding the fuel pump relay might have issues, the fuel pressure sensor might have issues, the fuel pump / regulator might have issues, or simply the plugs need to be replaced. Any clues if I should start with these (in ascending cost order), or a different warpath?
Thanks for reading (and listening).
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