cmac1130 Posted March 10, 2020 Share Posted March 10, 2020 my car at idle runs rough, not always , sometimes, i drive it come to a stop light and the car shakes, like a washing machine out of balance then comes back, roughness at 1 and 3 varies , up to 13 on 1, last week with cold weather up to 100 on 1......... no leakes, dw 65, new fuel filter, new intake seals, oxy is fine , it will take 20 secs when i restart the car when ap turns on to correct itself, but happens all the time, any ideas? Link to comment Share on other sites More sharing options...
DaveWaters Posted March 10, 2020 Share Posted March 10, 2020 Move the coil pack from a misfiring cylinder to a known good cylinder see if misfire follows and then if no change do the same with injectors. Next step after that would be compression and leak down tests. You may want to do a boost leak test with soapy water sprayed around the intake seals the were recently replaced. Link to comment Share on other sites More sharing options...
cmac1130 Posted March 11, 2020 Author Share Posted March 11, 2020 coil packs are brand new, did leakdown, compression and boost tests, all came back fine Link to comment Share on other sites More sharing options...
DaveWaters Posted March 11, 2020 Share Posted March 11, 2020 Thats good news. Injector relocate would be next step. Link to comment Share on other sites More sharing options...
cmac1130 Posted March 12, 2020 Author Share Posted March 12, 2020 i have suby specialist who does the work, sent data logs to our tuner at turbo tek, waiting for response, the only other thing is i have a breathilyzer installed through the ignition in the car, with all the things we have gone through and relplaced, this is the only odd ball remaining, besides the worse of a bad ring in cyl 1 Link to comment Share on other sites More sharing options...
cmac1130 Posted March 18, 2020 Author Share Posted March 18, 2020 injectors are fine, changed the maf sensor, now getting more misfires in cyl 3, on startup after 2 to five minutes feels like its always trying to find new idol like after ecu restart with ap Link to comment Share on other sites More sharing options...
Max Capacity Posted March 18, 2020 Share Posted March 18, 2020 check post 37, https://legacygt.com/forums/showthread.php/replace-avcs-oil-control-valves-ocvs-262119.html May be that will help ? 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...
HellsDisciples Posted March 18, 2020 Share Posted March 18, 2020 my car at idle runs rough, not always , sometimes, i drive it come to a stop light and the car shakes, like a washing machine out of balance then comes back, roughness at 1 and 3 varies , up to 13 on 1, last week with cold weather up to 100 on 1......... no leakes, dw 65, new fuel filter, new intake seals, oxy is fine , it will take 20 secs when i restart the car when ap turns on to correct itself, but happens all the time, any ideas? Had more or less the same thing with my 05 before my piston blew. Hoping that's not the case. If you can, pressure test the pistons to make sure its not loosing compression in any cylinder. Couldn't do that before my piston exploded... $3.8K later on rebuilding the engine.. and the shop I did it.. still not 100% that its fixed yet.. he had to tear it down once already and redo the building after only 300 or so miles due to a faulty crank. Link to comment Share on other sites More sharing options...
Max Capacity Posted March 18, 2020 Share Posted March 18, 2020 Had more or less the same thing with my 05 before my piston blew. Hoping that's not the case. If you can, pressure test the pistons to make sure its not loosing compression in any cylinder. Couldn't do that before my piston exploded... $3.8K later on rebuilding the engine.. and the shop I did it.. still not 100% that its fixed yet.. he had to tear it down once already and redo the building after only 300 or so miles due to a faulty crank. I guess you missed post 3 above. 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...
cmac1130 Posted March 24, 2020 Author Share Posted March 24, 2020 driving today, huge snow storm, going 40 mpg, car lost power, same when i down shift, gave gas but nothing, made me think of my old 240sx and oxygen sensor, was like night and day with power, big stutter, any ideas Link to comment Share on other sites More sharing options...
Max Capacity Posted March 24, 2020 Share Posted March 24, 2020 Any check engine lights ? 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...
cmac1130 Posted March 25, 2020 Author Share Posted March 25, 2020 none but the past two days had to reset ecu twice Link to comment Share on other sites More sharing options...
Max Capacity Posted March 26, 2020 Share Posted March 26, 2020 Check the connectors at the gas pedal and throttle body. make sure they are tight and clean. I'm just guessing but that should be free. 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...
grovlet Posted March 27, 2020 Share Posted March 27, 2020 also check the coil pack connectors - the plugs get brittle and crack causing loose connection. I had one break completely - car idled only (barely ran - totally rough/would not go over 1.5K RPM) - zip tied connector back together = all better. I did eventually replace it afterwards - but at least it proved out the issue. Link to comment Share on other sites More sharing options...
cmac1130 Posted March 27, 2020 Author Share Posted March 27, 2020 everything is all brand new and nothing has worked, even in si mode car has no power, nothing like it usta, its begining to sound like a bad cylinder, misfires get all the way up to 100 now,af sensor didnt do anything when new was installed today Link to comment Share on other sites More sharing options...
Infosecdad Posted March 27, 2020 Share Posted March 27, 2020 Trying to summarize: * Coilpacks: "new" - What brand? * Coilpack connectors: "?" - Do you have black in the back and white in the front on each side? * Injectors: "are "fine" - What did you do to test that? * MAF: "new" - What brand? * Front AF: "new" - What brand? * Leakdown: "good" - Do you have the numbers? * Compression: "good" - Do you have the numbers? * Intake gaskets: "new" - OEM? * Cyl 1: Primary misfire * Cyl 2: not mentioned * Cyl 3: secondary misfire * Cyl 4: not mentioned Any voltage mods? Like the fuse for bumping the voltage? Has anything been moved between the sides (1/3) and (2/4)? Link to comment Share on other sites More sharing options...
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