misfire on #5 cylinder

2002 MAZDA TRIBUTE
89,000 MILES
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PINGISI
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compression down on #5 cylinder dealer wants to replace head hard miss around 45 mph car was not driven for a month after fueling car started to miss
Sep 25, 2012 at 8:47 PM
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KHLOW2008
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Low compression does not necessarily mean a bad head and I don't see why it is necessary. It could be the valves or piston rings.

Since vehicle was not driven for some time, a little running might get the compression back.
Sep 25, 2012 at 9:07 PM
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PINGISI
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had to change coil and plug on that cylinder 4 months ago only started to misfire after filling fuel tank any other suggestions
Sep 25, 2012 at 10:55 PM
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KHLOW2008
  • CAR REPAIR CONTRIBUTOR
  • 41,814 POSTS
Get another compression test and see if the compression is not up, try a wet test. The misfiring could be due to excessive fuel in cylinder causing the drop in compression pressure.

Are there any trouble codes and was the fuel injector checked/tested?
Sep 26, 2012 at 4:46 AM
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LUISPONCE
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Mazda tribute low compression problems. have a compression test if fail don't waste you time, the time chain last a lifetime and 99% are the possibilities that you have a bad head or gasket problem, just a high price for not checking you fluids
Nov 30, 2012 at 2:04 AM