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98 outback 5mt: rough start as of late
Posted 08 December 2012 - 09:53 PM
So lately with the cold weather, my outback wagon has an intermittent rough start. It sounds like the starter is doing that winding up sound and also takes a few extra cranks to start like when I had to replace the contacts. However, now when the car does start, I can tell it's having a tough time for about 5 seconds.
My mind tells me it's time for new starter contacts again but I never got the rough start thing before. maybe a fuel pump that's starting to go bad? When the car is running rough for that brief moment, the piston slap when cold is more pronounced too but then the high initial idle at start up kicks in and everything is fine.
Sorry for the mash-up of symptoms but that's what I'm facing. I just don't want to get stuck somewhere up in the mountains this winter so any advice is much appreciated.
Posted 08 December 2012 - 11:36 PM
Posted 09 December 2012 - 12:05 AM
how does it re-start if the engine is still warm?
Posted 09 December 2012 - 01:50 AM
Knock sensor has been replaced, PCV valve is good, only non Subaru part I've used lately is NTK o2 sensors, I get an occasional CEL for that fuel solenoid valve thing that's mounted under the intake manifold on the passenger side... hasn't popped up in a while.
Oh, and another symptom that popped up around the same time is what I believe is the alternator bearing making some noise. I rebuilt the PS pump not too long ago and put in a new bearing so I don't think it's that and also, when I loosened the belt a bit, the squealing went away but now it's back all the time.
Ran a little rough when I was getting an EGR code but replaced the backflow transducer with a used one and that fixed it. It starts and runs completely normal when warm but I drive my car only every other day and when it isn't parked in the warm garage, it starts to act up. Car has 180k, I've owned it for 10 years. I am pretty OCD about car care and since my commute is 90 miles round trip, I really don't want to break down somewhere random.
Thanks for any and all insight!
Posted 09 December 2012 - 02:05 AM
I suppose one slim possibility would be leak-down of fuel pressure after the car sits for a long period. To test that, next time you're confident the car would fail to start well, cycle the key to ON (but not start) wait 5 seconds, then to OFF. repeat 4-5 times. The fuel pump should cycle on fro a few seconds each time - pumping-up the pressure if it's low. The see if the car starts normally. If it does, maybe an injector is leaking or there's some other fuel pressure issue.
Posted 09 December 2012 - 04:44 PM
Just a thought
Posted 10 December 2012 - 07:16 PM
Also could be engine temperature sensor, as someone also mentioned.
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