Question about 2004 Volvo XC70
The Misfire in Cyl 4 can be caused by
- bad/poorly connected/broken plug wires
- truly bad piston seal or scored cylinder wall.
- clogged/malfunctioning injector.
Only a compression test will reveal the true problem in cylinder 4.
Check the wires first though.
The bank 1 sensor is the front o2 sensor.
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Posted on May 13, 2009
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Posted on Jan 02, 2017
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