SPONSORED LINKS

Fuel system running lean?

Tiny
ILVAGAMA
  • MEMBER
  • 2006 MAZDA 3
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 300,000 MILES
Vehicle throwing code P2187 (System too lean at idle). I have replaced both o2 sensors, a new fuel filter, and run an injector cleaner through it, issue remains. Fuel trim (long term) is sitting around 20% and short term grows from 0 to 20% when at idle over approximately 5 minutes. While running, short term fuel trim varies between +8% and -8%. Hoping for suggested next steps in diagnosis before I shell out for new injectors, a new MAF sensor, new fuel pump, etc.
SPONSORED LINKS
Wednesday, March 6th, 2024 AT 5:44 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,909 POSTS
Yep, these are what is wrong typically when the engine is lean this guide can help you understand more on the problem, I can tell you if the power is okay and it starts up without cranking for an extended time I would replace the MAF sensor, this is a normal service item and if it is original at 300k it is a good bet, and if you get it from amazon you can send it back if it does not help the situation. Here is the location of the MAF sensor so you can swap it out. Check out the images (below). Please let us know what happens.
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, March 6th, 2024 AT 10:59 AM

Please login or register to post a reply.

Related Engine Lean Content

How To Fix an Engine Backfire
VIDEO
How To Fix an Engine Backfire
Instructional repair video
Lean Exhaust
GUIDE
Lean Exhaust
Common Misconception: When an engine misfires, the cylinder runs lean, not rich, this is because the air to fuel ratio favors air by 14x. Therefore, an engine must be...
VIEW MORE

Sponsored links