Runs lean

2000 MAZDA PROTEGE
180,000 MILES • 1.6L • 4 CYL • FWD • MANUAL
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ZEMORZEMOR
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At idle long term fuel trim vary for 6.3 % to sometimes 14.2%. what could cause the problem?
May 14, 2017 at 7:10 AM
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HMAC300
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vacuum leak, low fuel pressure leaky injector etc. scan for codes and check fuel pressure with a gauge. See link. auto parts rent gauge.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
May 14, 2017 at 8:46 AM
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ZEMORZEMOR
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i forgot to tell you the oxygen sensor stays lean after i shut off the engine and started back .it will oscillate after i bleep the gas pedal
May 15, 2017 at 3:53 PM
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HMAC300
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check what I said in first reply
May 15, 2017 at 4:36 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.