mrhobbz Posted January 20, 2015 Report Share Posted January 20, 2015 Keep running into this code, initially it was on both banks so i replaced both O2s and now its only on bank 2. O2 voltages look good but its maxing out the fuel trims on bank 2. Pretty sure its leaking st the header but can't really hear a leak with how loud it is. Does anyone have any tricks for finding leaks at the header? Quote Link to comment Share on other sites More sharing options...
TurboRust Posted January 20, 2015 Report Share Posted January 20, 2015 Fords will throw lean codes when oil rots through the pcv elbows and allows a post m.a.f. air leak, check those at the valve covers and intake connections Quote Link to comment Share on other sites More sharing options...
mrhobbz Posted January 20, 2015 Author Report Share Posted January 20, 2015 Checked everything except the elbows last week when i tried cleaning the maf just in case. Will check the elbows next Quote Link to comment Share on other sites More sharing options...
TurboRust Posted January 20, 2015 Report Share Posted January 20, 2015 If not takes some brake cleaner and spray down the intake and vacuum lines to check for leaks you may not be seeing.. Quote Link to comment Share on other sites More sharing options...
mrhobbz Posted January 20, 2015 Author Report Share Posted January 20, 2015 Will give that a shot, thank you sir. I'm not terribly concerned with that motor but I want to keep it running for a few more months. Once i find a house down here with a garage I'm going to be yanking the 4.6 out of it Quote Link to comment Share on other sites More sharing options...
Geeesammy Posted January 20, 2015 Report Share Posted January 20, 2015 Came to post about a vacuum leak. I've seen Dyno Brian run into this twice while I've been at his shop visiting. Quote Link to comment Share on other sites More sharing options...
mrhobbz Posted January 23, 2015 Author Report Share Posted January 23, 2015 10-4 Haven't gotten around to checking it yet. I'm thinking its either a vacuum leak or an exhaust leak. I did headers on it over the winter and the gaskets they came with were junk but I had to get it put back together. I haven't checked and re-tightened the header bolts yet since they're such a pain in the ass to get to on a garage floor Quote Link to comment Share on other sites More sharing options...
Cordell Posted January 23, 2015 Report Share Posted January 23, 2015 I would certainly check for vacuum leaks, but it sounds like you need header gaskets. Exhaust leak before the O2 would do exactly that on one side. Quote Link to comment Share on other sites More sharing options...
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