86subaru Posted April 6, 2012 Share Posted April 6, 2012 (edited) 2000 legacy a/t 131,000 mi popping comin from drivers side , check engine light flashing , code reader 3-4 misfire, shop says cam is damaged , new plugs, wires, ejectors cleaned, fuel filter,good coil Edited April 6, 2012 by 86subaru Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted April 6, 2012 Share Posted April 6, 2012 2000 legacy a/t 131,000 mi popping comin from drivers side , check engine light flashing , code reader 3-4 misfire, shop says cam is damaged , new plugs, wires, ejectors cleaned, fuel filter,good coil maybe slipped cam timing - was the belt done at 105K? who did the work and what was replaced? any wrecks, repairs, towing, mods done before this happened? Quote Link to comment Share on other sites More sharing options...
86subaru Posted April 6, 2012 Author Share Posted April 6, 2012 timing done at 100,000 mi no damage, mpg at 25 highway ,when you push on gas is when it pops alot Quote Link to comment Share on other sites More sharing options...
Rooster2 Posted April 6, 2012 Share Posted April 6, 2012 burnt exhaust valve? Quote Link to comment Share on other sites More sharing options...
95legwagon Posted April 6, 2012 Share Posted April 6, 2012 i really cant add to this thread but as with all 2.5's ....id start with having the headgaskets checked..... veeerrrryyy common problem..... and your 2000 legacy should definitly be a 2.5. not sure if this would cause a missfire but ya never know Quote Link to comment Share on other sites More sharing options...
86subaru Posted April 6, 2012 Author Share Posted April 6, 2012 are the exhaust valves easy to change Quote Link to comment Share on other sites More sharing options...
Caboobaroo Posted April 6, 2012 Share Posted April 6, 2012 i really cant add to this thread but as with all 2.5's ....id start with having the headgaskets checked..... veeerrrryyy common problem..... and your 2000 legacy should definitly be a 2.5. not sure if this would cause a missfire but ya never know Unless they've blown internally like the EA25D (DOHC 2.5 from '97-'99), then they leak externally. Only way to know if its an internal issue is to do a compression and leak down tests to verify. They are known for dropping exhaust valve guides which holds the exhaust valves open. Drop the exhaust manifold off, take a flash light and look inside the exhaust ports. the guides should only stick out of the heads about 1/8" or so. If they are out any further, then you've got a dropped guide and the heads has to be gone through. If you do one side, might as well do the other side while you're at it. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted April 7, 2012 Share Posted April 7, 2012 3 and 4 are on opposite sides so I have a hard time thinking its timing/valve related. New spark plugs and wires will go a long way. Get NGK or Subaru OE wires and plugs. Quote Link to comment Share on other sites More sharing options...
86subaru Posted April 7, 2012 Author Share Posted April 7, 2012 already did , but will look again Quote Link to comment Share on other sites More sharing options...
Recian Posted April 8, 2012 Share Posted April 8, 2012 3-4 use the same coil if im not mistaken. each coil pack has 2 humps so i can assume 2 coils. One for 1-2 and the other for 3-4. It's possible the coil inside the pack has failed? I've seen coils seem to do fine they just dont put out enough voltage so at idle they work great but when revved the exess rpm and pressure blows out the weak spark since the coil cant put out enough spark. So many of these cars use the same pack they should be easy to snag at a local junkyard for cheap just for testing purposes. That would explain the misfire but the popping im not sure of unless the coil has come apart and is sparking inside the housing? far fetched theory but possible. Quote Link to comment Share on other sites More sharing options...
86subaru Posted April 8, 2012 Author Share Posted April 8, 2012 ok, already swapped coils , but my spare could be bad Quote Link to comment Share on other sites More sharing options...
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