stuck686 Posted April 27, 2015 Share Posted April 27, 2015 Had cyl 3 misfire code this weekend, car was idling rough and bogging down. Saw coil pack connector was loose (broken tab), changed coil pack just in case and ziptied connected for now. Cleared code with AP (stage 2 for the last 40k miles no issues). Car idles perfect, drives fine until i really get on the gas. There seems to be like a backfire popping noise, no codes come up. Could my coil pack mishap have fouled the plug? or is this something else. Link to comment Share on other sites More sharing options...
Max Capacity Posted April 27, 2015 Share Posted April 27, 2015 vacuum leak ? Can you do a boost leak test ? 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
stuck686 Posted April 27, 2015 Author Share Posted April 27, 2015 I have never had to before but i guess i could try. I dont think its leaking since the car was 100% like two days ago, i thought my faulty connector could have led to something. Link to comment Share on other sites More sharing options...
Max Capacity Posted April 27, 2015 Share Posted April 27, 2015 We tell everyone to zip tie the vacuum hose, they can pop off over time. You can pull the small hose off the blow off valve and give it a short blast of air, then put your thumb over the hose. Make sure you put a pint size paint can in the hose off the air filter box to keep the air pressure in. If you have a leak you should be abole to hear it. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
stuck686 Posted April 27, 2015 Author Share Posted April 27, 2015 I really dont think its a leak, it boosts just fine. I am getting cylinder 3 roughness on the accessport, none in the others. 2 counts when i floored it and backed off right away. Plug or injector? Link to comment Share on other sites More sharing options...
heiche Posted April 27, 2015 Share Posted April 27, 2015 i sense tris approaching BtSsm - Android app/Bluetooth adapter. LV, logging, gauges and more. For 05-14 Legacy (GT, 2.5, 3.0, 3.6), 02-14 WRX, 04-14 STi, 04-14 FXT, 05-09 OBXT Link to comment Share on other sites More sharing options...
BostonLGT Posted April 27, 2015 Share Posted April 27, 2015 I really dont think its a leak, it boosts just fine. I am getting cylinder 3 roughness on the accessport, none in the others. 2 counts when i floored it and backed off right away. Plug or injector? I had a similar problem that I took too long to diagnose and ended up with ringland failure. IMHO, until you get a better idea of what this is, stop driving your car. Have you checked to see what your AFR does when you get the roughness? Have you checked around the head for leaks? Also, if you want more help from the vets, it might be a good idea to list any mods you have done to clarify. Link to comment Share on other sites More sharing options...
stuck686 Posted April 27, 2015 Author Share Posted April 27, 2015 I got new plugs so I will do that tomorrow. If i stay out of high boost its fine, no roughness count no codes. Link to comment Share on other sites More sharing options...
Max Capacity Posted April 28, 2015 Share Posted April 28, 2015 I hope you can change #3 plug first and then drive the car and see if it's fixed. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
Max Capacity Posted April 28, 2015 Share Posted April 28, 2015 http://legacygt.com/forums/showthread.php/legacy-gt-2009-service-engine-light-mis-fire-238731.html Read post #8, I should have remembered that. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
stuck686 Posted April 28, 2015 Author Share Posted April 28, 2015 its already a new could pack and it started idling and driving much better. No more codes. Just under boost i am gettting this misfire or whatever and backfire like its running too rich Link to comment Share on other sites More sharing options...
stuck686 Posted April 28, 2015 Author Share Posted April 28, 2015 cobb stage 2 for the past 55k miles cnt downpipe turboxs catback turboxs hybrid bpv JDM avo panel filter Just got a new clutch couple weeks ago and grimmspeed uppipe since my straight one had cracked Link to comment Share on other sites More sharing options...
stuck686 Posted April 29, 2015 Author Share Posted April 29, 2015 problem solved with new plugs (NGK oe plugs gapped at .028) run better than before! Link to comment Share on other sites More sharing options...
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