initzero Posted July 6, 2020 Report Share Posted July 6, 2020 I have a 2004 F150 5.4 that has 2 lean codes, bank1 and bank2. The long trim fuel is 20% plus 8-10% on short term fuel trim at idle.When I bring the RPM up to 1500 the fuel trim go down to about 10% long term. The fuel pressure is 40PSI at idle. I have used a smoke machine to look for a vacuum leak but was not able to find one. There is also a code for intake runner stuck closed. I'm running out of ideas. Any thoughts? Quote Link to comment Share on other sites More sharing options...
STEVE-O Posted July 6, 2020 Report Share Posted July 6, 2020 Might have to take the intake off and Inspect it Quote Link to comment Share on other sites More sharing options...
initzero Posted July 6, 2020 Author Report Share Posted July 6, 2020 If I take off the intake and don't see any damage or leaking gasket, are the gaskets reusable? Quote Link to comment Share on other sites More sharing options...
STEVE-O Posted July 6, 2020 Report Share Posted July 6, 2020 If I take off the intake and don't see any damage or leaking gasket, are the gaskets reusable? being that old I would replace them and also check on the condition of those cam phasers Quote Link to comment Share on other sites More sharing options...
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