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1997 Subaru Outback rough idle

Tiny
ALASKABRUCE
  • MEMBER
  • 1997 SUBARU OUTBACK
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 185,000 MILES
My 97 outback 2.5 has been exhibiting rough idle for almost a year now. It starts fine, runs well otherwise, plenty of power, and is getting mid-20's mpg. No oil burning, 165-170 compression on all cylinders, good consistent vacuum readings. Have replaced plugs, wires, coil. Codes show misfire on #1 & 2 cyls. I have also recently replaced the fuel pump, and tried swapping injectors around, but the rough idle remains. Not sure what else to look for. Thanks for any suggestions!
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Sunday, July 25th, 2010 AT 5:36 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Hi there,

Thank you for the donation,

I would next be checking for a vacuum leak around those cylinders, I do see that you say the vacuum readings are ok, but I still would try a tin of starter fluid and just spray a little around the manifold at those cylinders, if a small leak is there, the revs will increase, try this next.

Mark (mhpautos)
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Sunday, July 25th, 2010 AT 7:17 PM
Tiny
ALASKABRUCE
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Forgot to mention it but that was also one of the first things I tried, no apparent vacuum leaks anywhere, even checked all lines for possible cracks/splits that would be opening up once engine warmed up, etc.
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Sunday, July 25th, 2010 AT 8:01 PM
Tiny
MHPAUTOS
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  • 31,938 POSTS
OK, I will give it some thought and I will get back to you soon.

Mark (mhpautos)
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Sunday, July 25th, 2010 AT 8:09 PM

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