nickb21 Posted October 9, 2003 Share Posted October 9, 2003 I'm curious to see if anyone knows of a solution to this, my '02 outback (2.5, man) likes to emit a pretty quite "pop", almost like a backfire, most often when upshifting from 1>2 or 2>3. Did a little reading, maybe just some unburned fuel being dragged into the exhaust manifold? It's nothing I can't live with, doesn't always happen, just a bit curious if others have any suggestions, thanks. Link to comment Share on other sites More sharing options...
ferret Posted October 9, 2003 Share Posted October 9, 2003 Nick, I have the same phenomenia on my '02 Forester L 5sp. I have complained to the dealer and opened a "case" with Subaru about it. I now have 45k on the car and it still happens. They say they have no record of anyone else having this issue. The reason I make a big thing about it, is I've had 4 oxygen sensors replaced. The Last one lit the Check engine light right at the time I shifted and had one of these 'pops'. Yes I can and have lived with it. For me if it did NOT take out the O2 sensor, I probably would not have been so upset. But my point is, If it continues and out of warrenty takes out the sensor at over $100 a "pop", this is an expensive engineering issue, at least for me. which is being pushed under the carpet. Link to comment Share on other sites More sharing options...
ScoobySchmitty Posted October 9, 2003 Share Posted October 9, 2003 My 2.2 manual legacy will do a little burble imitation of a backfire when I upshift. That is, I usually blip the throttle on the upshift, I'm assuming you both do the same, or do you let the clutch do the work??? Not sure why soobs do this, but it doesn't bother me. I've heard of some rally and drift cars that use a "backfire system", making the car backfire on close throttle, but I don't know what it's for. I guess it just sounds cool :-P ScoobySchmitty:banana: Link to comment Share on other sites More sharing options...
cookie Posted October 9, 2003 Share Posted October 9, 2003 I have seen bad EGRs cause backfires. Link to comment Share on other sites More sharing options...
Commuter Posted October 9, 2003 Share Posted October 9, 2003 They got rid of the EGR in the evolution from the 2.5L DOHC Phase I engine to the 2.5L SOHC Phase II engine. Sorry, I can't offer anything on this one. Would a manifold leak do anything like this? Commuter Link to comment Share on other sites More sharing options...
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