Ernesto2.5 Posted November 26, 2021 Share Posted November 26, 2021 I tried searching here and online but can't find anything specifically related to my issue. I recently bought a 2015 Legacy 2.5 Limited from a Subaru dealer. The current mileage is 89,101 miles. Today was the second time the Legacy would start-up but immediately die(turn-off) I got it to stay on by revving the engine on start-up. No CEL as of now but tomorrow I will connect my obdII scanner to check for pending codes. Anybody have a clue as to what may be causing this issue? It has happened only at night time when the outside temperature is colder. I work for a mobile dispensary so I do a lot of short distance driving. I noticed it (the issue) has happened after the vehicle is at normal operating temperature and after a short distance drive. Any input or knowledge of this issue would be greatly appreciated. I have warranty on the vehicle but replicating the problem at the dealer is highly unlikely. There is no record of spark plugs being replaced so I may change them. (Yes, I'm going to order oem spark plugs haha) Thanks in advance to anybody willing to give me some Insight Link to comment Share on other sites More sharing options...
Painless Posted November 26, 2021 Share Posted November 26, 2021 (edited) Welcome to the forum! Sorry to hear of your issue. Intermittent faults are the hardest to troubleshoot and easiest for dealerships to dismiss. What has helped me in the past (several times) is to capture it on video. (Describe what you are doing during the recording) It may take a while, but, once you capture it, walk on in and show them. There is a recall related to the fuel pump that may be a culprit but was for '19 models last I checked. https://legacygt.com/forums/showthread.php/2019-legacy-fuel-pump-recall-282976.html?t=282976&highlight=fuel+pump Keep the group posted with your findings and ultimate fix (it helps us all). Edited November 26, 2021 by Painless Link to comment Share on other sites More sharing options...
silverton Posted November 26, 2021 Share Posted November 26, 2021 clean the throttle body. Link to comment Share on other sites More sharing options...
Ernesto2.5 Posted November 26, 2021 Author Share Posted November 26, 2021 Welcome to the forum! Sorry to hear of your issue. Intermittent faults are the hardest to troubleshoot and easiest for dealerships to dismiss. What has helped me in the past (several times) is to capture it on video. (Describe what you are doing during the recording) It may take a while, but, once you capture it, walk on in and show them. There is a recall related to the fuel pump that may be a culprit but was for '19 models last I checked. https://legacygt.com/forums/showthread.php/2019-legacy-fuel-pump-recall-282976.html?t=282976&highlight=fuel+pump Keep the group posted with your findings and ultimate fix (it helps us all). Thanks for replying! Thats a great idea! Im on hold at the moment with Subaru customer service.... Lets see what they say. I have a feeling it may be fuel pump related. From the research Ive done so far. I'm reading the 2015 Legacy's have the Denso low pressure fuel pump that was recalled in newer models. I will definitely keep everyone updated. Link to comment Share on other sites More sharing options...
silverton Posted November 27, 2021 Share Posted November 27, 2021 Clean. The. Throttle. Body. Link to comment Share on other sites More sharing options...
Ernesto2.5 Posted November 29, 2021 Author Share Posted November 29, 2021 Clean. The. Throttle. Body. Is there any risks in cleaning an "electronic" throttle body? Link to comment Share on other sites More sharing options...
silverton Posted November 29, 2021 Share Posted November 29, 2021 just the actuator part is electronic. there is still a butterfly plate that gets carbon build up. when i was a lowly express tech at the dealer we often had to clean the throttle body after disconnecting the battery or doing an ecm update, as the cars would fire right up, but die. douche a rag with throttle body cleaner, push the plate open by hand, it only goes 90 degrees before hitting its stop. wipe both sides of the plate and inner diameter of the throttle chamber. you can be more aggressive with it than you might think. when you go to restart it will crank longer than normal but it may fix your issue. honestly i'd be surprised if it wasn't something they already tried to do, if it was an actual subaru dealership that is. I have found being in the independent world that these newer cars are a bit of a mystery. the diag tools available aren't as good as subarus. Link to comment Share on other sites More sharing options...
PATS4LIFE Posted November 29, 2021 Share Posted November 29, 2021 just the actuator part is electronic. there is still a butterfly plate that gets carbon build up. when i was a lowly express tech at the dealer we often had to clean the throttle body after disconnecting the battery or doing an ecm update, as the cars would fire right up, but die. douche a rag with throttle body cleaner, push the plate open by hand, it only goes 90 degrees before hitting its stop. wipe both sides of the plate and inner diameter of the throttle chamber. you can be more aggressive with it than you might think. when you go to restart it will crank longer than normal but it may fix your issue. honestly i'd be surprised if it wasn't something they already tried to do, if it was an actual subaru dealership that is. I have found being in the independent world that these newer cars are a bit of a mystery. the diag tools available aren't as good as subarus. Wouldn’t disconnecting that battery then cleaning throttle body then connecting battery back would screw up the idle? Link to comment Share on other sites More sharing options...
iyalla Posted November 29, 2021 Share Posted November 29, 2021 When this happened in my EJ25 car it was the MAF sensor. Could be the same here. Unplug it and see if it stays on when started. Link to comment Share on other sites More sharing options...
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