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Misfires mystery

Tiny
LOOKING4HELP
  • MEMBER
  • 2004 LAND ROVER FREELANDER
Engine Performance problem 6 cyl All Wheel Drive Automatic 165000 miles

when taken into a shop for diagnostics the read out is pistons 2, 4, & 6 are misfiring. When driving the rpms are high and there is a loss of power going up hills. We replaced most of the air system besides the catalytic converter. And the car runs better when you unplug the sensors.
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Thursday, August 5th, 2010 AT 5:46 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,877 POSTS
Hello,

this is a classic problem with the MAP sensor. What happens is the sensor becomes contaminated which hinders its ability to read correctly. Here is a diagram (below) that will show you what you are in for when replacing this sensor along with the guide on general misfires.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please let us know what you find.

Cheers, Ken
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Wednesday, July 19th, 2017 AT 3:17 PM

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