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02-22-2019, 02:44 PM | #1 |
Registered User
Join Date: Nov 2003
Location: League City, TX
Posts: 922
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Lean Code Help - P1131 & P1151
My mach is running rough, small popping on passenger side.
Finally threw codes P1131 & P1151, Lean codes. I did some internet searching and lots of results, but alot were after changes. I have made no changes in 5+ years. Its a NA bolt on car with JLT, long tubes, tune, and off road H pipe. My guesses are vacuum leak, dirty mass air, bad fuel pump, dirty fuel filter or bad O2 sensor. Any insight or similar issues to save me some time fixing? Thanks, Keith
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Keith 2003 TR Mach BBK Long Tubes/O/R H pipe Magnapack catback with Spintechs JLT RAI intake, Nitto Drag Radials P&P Intake w/ 3/8 intake spacer SCT tune by Don @ LaSota Racing Steeda Triax ,Centerforce Clutch |
02-22-2019, 03:24 PM | #2 |
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Join Date: Dec 2012
Location: so cal
Posts: 389
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Do you have a tuner or a scanner you can Data monitor with? I would check fuel pressure at the rail, look for leaks, if you can data monitor your fuel trims you can spray some carb clean in any areas that may have a vacuum leak and look for changes in the data monitor
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1st Mach 2nd mustang Mods: K&N drop filter, Full Mac exhaust with Lt headers, 4:10 gears, eibach sport line springs, tubular cross member, steeda short throw |
02-22-2019, 03:30 PM | #3 |
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Join Date: Nov 2003
Location: League City, TX
Posts: 922
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Re: Lean Code Help - P1131 & P1151
Might have to try, never data logged before. I have the tuner.
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Keith 2003 TR Mach BBK Long Tubes/O/R H pipe Magnapack catback with Spintechs JLT RAI intake, Nitto Drag Radials P&P Intake w/ 3/8 intake spacer SCT tune by Don @ LaSota Racing Steeda Triax ,Centerforce Clutch |
02-22-2019, 10:06 PM | #4 |
700 HP Mach
Join Date: Nov 2003
Location: Orlando, FL
Posts: 8,384
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Re: Lean Code Help - P1131 & P1151
Is that a lean code for each bank or what? If so I’d look at stupid stuff like your JLT connections, pass side valve cover to JLT line and driver side pcv line. There’s also an evap hose from pass fender to TB that tends to rot
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03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater |
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