Question about 2003 Subaru Forester

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My 2003 subaru forester idle very rough. if you open the hood and look at the engine it is shaking like its firing on only three cylinders. I need some help.I changed the spark plugs, gas filter, air filter and all the coil packs so far

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  • chengalaths May 02, 2009

    Exactly same problem but its on and off. I suspect its something to do with the fuel quality.

    Shyam

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  • 23 Answers

1) Check all the vacuum hoses for a leak in the rubber hose or a hose that isn't connected. Vacuum leaks cause motors to shake and stumble on acceleration.
2) There's a plastic T connection on the back side of the engine behind and under the air cleaner box. That T connector joins together three air hoses of different sizes and is prone to breaking from heat stress. Only a Subaru dealer will have this part.
3) Even though the spark plug wires are new, you may have a bad one. Don't waste your money on cheap parts; they cost more in the long run.
Good luck!

Posted on May 07, 2009

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1 Answer

Subaru forester 2005 has rough idle...


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