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Runs lean

Tiny
ZEMORZEMOR
  • MEMBER
  • 2000 MAZDA PROTEGE
  • 1.6L
  • 4 CYL
  • FWD
  • MANUAL
  • 180,000 MILES
At idle long term fuel trim vary for 6.3 % to sometimes 14.2%. What could cause the problem?
Sunday, May 14th, 2017 AT 7:10 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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
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Sunday, May 14th, 2017 AT 8:46 AM
Tiny
ZEMORZEMOR
  • MEMBER
  • 486 POSTS
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
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Monday, May 15th, 2017 AT 3:53 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check what I said in first reply
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Monday, May 15th, 2017 AT 4:36 PM

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