clinternet Posted August 8, 2019 Share Posted August 8, 2019 (edited) Looking for troubleshooting assistance with my 04 Subaru Outback 4cyl MT. It has a very noisy intake and anemic performance under 3k RPM. I mistook the noisy intake for an exhaust leak so I replaced the exhaust manifold gasket but the problem persists. I’m new to car maintenance, with a background in computer hardware support. Any help would be appreciated. I’m not sure what’s causing this. Could this a valve/vacuum/timing issue? Edited August 8, 2019 by clinternet Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted August 8, 2019 Share Posted August 8, 2019 when was the timing belt system last serviced? Is the cel on and what codes are stored? (parts stores can scan for trouble codes - or a phone app and an ELM327BT adapter can be helpful) holding some small tubing to your ear and moving the other end around the intake tubing and other spots - maybe you'll hear a loud sound? 1 Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted August 8, 2019 Share Posted August 8, 2019 Check the EGR tube. GD 2 Quote Link to comment Share on other sites More sharing options...
clinternet Posted August 8, 2019 Author Share Posted August 8, 2019 Engine has 167k miles. Timing belt and head gasket replaced within 2k miles by seller. No CEL currently lit. A code reader is a great idea tho. I just ordered a BlueDriver scan tool that will be here Friday. I will report back with what I find. EGR tube sounds like a good place to start. Maybe I should soak it in carb cleaner? I was considering giving her the ol’ Sea Foam treatment. Quote Link to comment Share on other sites More sharing options...
clinternet Posted August 10, 2019 Author Share Posted August 10, 2019 (edited) GD called it. It was the EGR tube! Pipe was completely chopped. I repeated the previous hillbilly fix with 2 hose clamps and a 2” piece of hose for now. New OEM EGR tube inbound at Peninsula Subaru in a few days. Thank you both for your insight to a noob question! I owe you a beer the next time I’m in Milwaukie. Edited August 10, 2019 by clinternet Quote Link to comment Share on other sites More sharing options...
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