October 21, 200718 yr For those searching on this problem as I did... Cold starting was hard; didn't even have to be that cold. Backfiring and poor drivability until warm, then OK. No check engine light. Based on previous suggestions, I replaced the coolant temperature sensor. That completely fixed it. Good thing, too, I'm not sure what I would have tried next. BTW, getting to the thing is a b*tch. I once did it on my '95 impreza and couldn't remember just how. This article was most helpful! Step by step photos. www.lovehorsepower.com/SubaruDocs/CoolantTempSensor.html Those hoses didn't just slip off, however! Bill Hale Loveland CO
November 14, 200718 yr Author Well, bad news. The fix didn't really work. So I am looking for what would be next. I am pretty sure nothing is leaking. Any suggestions? I'd even take a good hunch. There must be lore on how to fix this. Tnx, Bill Hale For those searching on this problem as I did... Cold starting was hard; didn't even have to be that cold. Backfiring and poor drivability until warm, then OK. No check engine light. Based on previous suggestions, I replaced the coolant temperature sensor. That completely fixed it. Good thing, too, I'm not sure what I would have tried next. BTW, getting to the thing is a b*tch. I once did it on my '95 impreza and couldn't remember just how. This article was most helpful! Step by step photos. www.lovehorsepower.com/SubaruDocs/CoolantTempSensor.html Those hoses didn't just slip off, however! Bill Hale Loveland CO
November 14, 200718 yr Well, bad news. The fix didn't really work. So I am looking forwhat would be next.[...] If replacing the CTS seemed to cure the problem for a while, it might be that the connector is corroded. (Lots of sensors get replaced when it's actually a connection to them that's faulty.) I'd verify that's good (at least by visual inspection) before any further diagnosis. You could try removing and reconnecting it a few times, which often scrapes off corrosion, and see if that helps. If the current problem isn't too severe, this might explain the cause: http://endwrench.com/images/pdfs/LegacyIdleSum04.pdf Keep in mind that problems which only slightly affect operation when the engine is warm may be much more evident when it's cold. Is it completely "OK" when warmed?
November 14, 200718 yr Another question: Does there seem to be any relationship to the symptoms versus humidity?
November 14, 200718 yr Well, bad news. The fix didn't really work. So I am looking forwhat would be next. I am pretty sure nothing is leaking. Any suggestions? I'd even take a good hunch. There must be lore on how to fix this. Tnx, Bill Hale Did you disconnect the battery while doing the work, therby resetting the ECU to stock? Are you sure your CEL light is working? Plugs and wires, maybe? IMExperience, 95% of all fuel problems (suspected) are ignition problems (actual).
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