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2003 Subaru Forester Question: knocking noise &warranty of drive train(pistons)



, Bellingham, WA, March 02, 2010, 22:28

I took my 2003 Forester(manual trans) for an oil change with a concern about a "knocking" noise ..Dealer said it was the "pistons,but they have to take the engine apart. to be sure...
for a repair price 0f $2000 -$4000 . Isn't this part of the engine under warrant?

4 Answers
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  • Answer #1

    March 02, 2010, 23:16

    Do you have a warranty that covers the drive train?

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  • Answer #2

    patrick mannion from Greg Solow's Engine Room, March 03, 2010, 00:09

    Pistons would not give a problem in this engine unless the engine was seriously overheated in the past or had really infrequent oil changes.

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  • Medium-star Best Answer
    Visitor, March 18, 2010, 09:03

    try Subaru's upper cylinder cleaner it could be as simple as carbon build up a very common problem with vehicles not serviced at Subaru

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  • Answer #4

    Visitor, April 02, 2010, 12:37

    The knocking noise is apparently piston slapping from the short pistons in the top end. This has been an issue from 1998 up to and including the 2004 model. I have been told by a subaru dealer that Subaru oredered a "rebuild" for this to switch the pistons back to the long pistons that came with the pre 98 model and that are now standard after 2005. I have been told that subaru will cover this cost.

    Hope this helps

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