Loss of power, misfire

Tiny
NATHAN3698
  • MEMBER
  • 2001 LINCOLN NAVIGATOR
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 17,000 MILES
I changed the coils, spark plugs, sensors and it's worse. Now I'm loosing coolant and it still says bank 1and 2 lean misfire 7 and 2.
Friday, December 4th, 2020 AT 6:00 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Hi,

A lean mixture is usually the result of either a weak fuel pump or an engine vacuum leak. Have you checked those things?

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Next, where is the coolant leaking from? Can you locate the leak or is there nothing that seems like an issue? I'm asking because if you are not seeing the leak, it could be related to a head gasket issue. Take a look through this link:

https://www.2carpros.com/articles/head-gasket-blown-test

Let me know exactly what is happening. If it is possible, record it running so I can hear it. Also, if you can, let me know specifically what diagnostic trouble codes are present.

Take care,
Joe

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Friday, December 4th, 2020 AT 7:58 PM

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