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2004 XT AT
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1,103 Posts
Discussion Starter · #1 ·
It's another "my fuel consumption has increased" question. I stated a new thread because I've got a couple of other symptoms and I'm wondering if there could be a common cause for it all.

1) During city driving, my average consumption has dropped from ~22 to ~17, compared with say a year ago (yes, I am sad enough to keep a spreadsheet ;-) The drop appears to coincide with having the car serviced in November.

2) But on a long run, the fuel consumption is pretty well unchanged from a year ago. Up to 32mpg (bear in mind 2.0 engine and UK gallons).

3) This winter I noticed a lot of steam when the engine is cold. I mean a lot MORE steam that I would expect, for a given ambient temperature, and more than I remember from the car in previous winters. It quite billows out the back, and I have to operate the rear screen wiper a couple of times to clear the condensation it puts on the glass. Once the car is hot, the steam stops.

4) No coolant loss. I haven't topped up since the car was serviced in November and the level is the same.

5) There is an unburnt fuel smell at the exhaust when cold, but there always has been (perhaps it's worse, though). The exhaust tip is sooty, but it always been. There's no fuel smell in the engine compartment or elsewhere so I am not suspecting a leak.

Any thoughts on what could cause that combination? I'm tending to think some sensor that affects fuelling when cold has gone south and is making the car run rich when cold, but normal when hot. But.. does running rich create extra steam?

Thanks

-- Steve
 

· Registered
2004 XT AT
Joined
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1,103 Posts
Discussion Starter · #4 ·
Thanks for the suggestions. Bobby, O2 sensor does seems like a good bet. Simon, I think you may be right regarding "lots of condensation is normal" as I noticed another Subaru making equivalent amounts yesterday. Maybe my memory is faulty about previous winters. I also remembered that at the service they put a heavier weight of engine oil in that I had before, still within spec, but great, just what you want in winter :-(

-- Steve
 
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