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Engine safe mode? Limp mode?

Tiny
KATHLEEN MARIE P
  • MEMBER
  • 3 POSTS
  • 2002 FORD EXPLORER
  • V8
  • 4WD
  • AUTOMATIC
  • 240,000 MILES
Okay so the initial codes were PO301 and PO306 we identified them as a misfire on cylinder 6 we changed all of the spark plugs and then the serpentine belt and pulleys due to a squeal that recently started but seemed unrelated. Now the squeal is still continuing and coming from underneath we think. But the SUV is stuck in limp mode and the last time I drove it a couple days ago it wouldn't go over 2,000 RPM's or 20 to 30 km an hour. We are totally stumped and could use some help. Thank you.
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Friday, January 29th, 2021 AT 10:57 AM (Merged)
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
Would it be possible for you to upload a short clip of the noise? This would help tremendously! And have any new codes come up since the p0301, p0306? 2002 Explorer v8 doesn't have an electronic throttle body so I can't blame that. The PCM should have set a p1270 if it entered failure effects management mode. Were any coils replaced while the plugs were done? Also have a good look at the mass airflow sensor for any bugs or contaminants.
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Friday, January 29th, 2021 AT 10:57 AM (Merged)
Tiny
KATHLEEN MARIE P
  • MEMBER
  • 3 POSTS
Codes p1131 and p1161 also popped up, but were cleared when spark plugs were changed. It's at my dad's house so I can't get a sound clip right now. I can in the morning.
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Friday, January 29th, 2021 AT 10:57 AM (Merged)
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
Okay, those are lean codes and do not let a parts store sell you oxygen sensors for this! Lean codes plus lack of power = fuel pump or fuel system restriction or even a mass airflow sensor contamination problem. I would undo the air filter housing and inspect the mass airflow sensor, if it's contaminated you can give it a shot of brake clean or mass airflow sensor cleaner until the bug or whatever is stuck in it is gone.
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Friday, January 29th, 2021 AT 10:57 AM (Merged)
Tiny
KATHLEEN MARIE P
  • MEMBER
  • 3 POSTS
Thanks so much! I will pass this info along and hopefully it helps!
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Friday, January 29th, 2021 AT 10:57 AM (Merged)
Tiny
BMDOUBLE
  • MECHANIC
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No problem!
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Friday, January 29th, 2021 AT 10:57 AM (Merged)

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