Skispcs Posted May 6, 2019 Share Posted May 6, 2019 2014 Fusion with 2.0L ecoboost I occasionally receive the P0171 code (lean bank 1). It may go away for a month and then comes back. Using my odb2 reader, the sort term fuel trim is good but the long term fuel trim is high at idle. At idle it is typically 22 to 27. Under acceleration it appears to drop down a bit. At idle the O2 sensor seems to read a bit high (0.65 to 0.7) which if I remember means that the mixture is rich? I am thinking vacuum leak but I have not been able to find anything yet. I used a can of carb cleaner to spray around many of the hose connections to see if the idle changed at all. Can I search for a vacuum leak on a turbocharged engine the same way my old school butt looked for one? Spraying a bit of carb cleaner in the intake did not seem to impact the idle much. Any hints or common failure places on the 2.0L that I should take a look at? Thank You 0 Quote Link to comment Share on other sites More sharing options...
eGuru Posted May 6, 2019 Share Posted May 6, 2019 Absolutely do not spray carb cleaner (or other solvent) into the intake of a turbo charged engine - it can damage the turbo bearings. 1 Quote Link to comment Share on other sites More sharing options...
Skispcs Posted May 6, 2019 Author Share Posted May 6, 2019 19 hours ago, eGuru said: Absolutely do not spray carb cleaner (or other solvent) into the intake of a turbo charged engine - it can damage the turbo bearings. Thank you for the response. Do you have any references to cleaner damaging the bearings that I could read? The bearings should be sealed to prevent ingestion of things from the intake side of the turbo into the bearings. 0 Quote Link to comment Share on other sites More sharing options...
eGuru Posted May 6, 2019 Share Posted May 6, 2019 39 minutes ago, Skispcs said: Thank you for the response. Do you have any references to cleaner damaging the bearings that I could read? The bearings should be sealed to prevent ingestion of things from the intake side of the turbo into the bearings. Check out these posts and video. https://www.fordfusionforum.com/topic/17106-2014-20-dealer-fuel-induction-service-now-faulty-fuel-pressure-reg-vapor-manage-valve/?tab=comments#comment-99555 1 Quote Link to comment Share on other sites More sharing options...
akirby Posted May 7, 2019 Share Posted May 7, 2019 13 hours ago, Skispcs said: Do you have any references to cleaner damaging the bearings that I could read? The bearings should be sealed to prevent ingestion of things from the intake side of the turbo into the bearings. Both the factory and the technician who repairs them says not to do it - that should be enough. 1 Quote Link to comment Share on other sites More sharing options...
Skispcs Posted May 7, 2019 Author Share Posted May 7, 2019 Thank you for the responses, I will do some reading. Getting back to the main point, looking for some ideas to solve the lean bank 1 or anyone with suggestions on common vacuum leak areas or ideas for locating the a leak. Might try a propane torch but I have not used that method before. 0 Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted May 17, 2019 Share Posted May 17, 2019 Start by pulling plugs and seeing what story they have to tell. If all the plugs appear alike, then the problem is upstream. (post pics of the plugs) If only 1 has an issue, then you have found the culprit cylinder, and it is most likely a stuck fuel injector. You can mist water as well to find the leak, you do not need to use any kind of solvent. Issues can be caused by a bad EVAP purge valve or failing brake booster check valve also, in addition to the air intake system. 0 Quote Link to comment Share on other sites More sharing options...
tyrantfour Posted December 23, 2023 Share Posted December 23, 2023 On 5/7/2019 at 6:32 PM, Skispcs said: Thank you for the responses, I will do some reading. theyre gonna drag me for digging up this old post, but i was hoping you found a solution? dealing with a problem myself that is defying all logic. 0 Quote Link to comment Share on other sites More sharing options...
Whover Posted January 5 Share Posted January 5 Skispcs Did you find a solution ? Same issue on my 2013. Thanks 0 Quote Link to comment Share on other sites More sharing options...
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