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03-28-2013, 10:28 PM
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#9 |
  Drives: 08 Yaris Sedan Join Date: Oct 2008
Location: California - Bay Area
Posts: 2,773
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Missfire is either mechanical / electrical / or fuel related. If the missfire happens when its more under load then its usually electrical such as a coil. One way to test it is remove the coil from cylinder 4 and switch it with cylinder 3. See if it sets a code p0303 then its a defective coil. If it still sets a code p0304 perform a compression test on cylinder 4 to eliminate burn valves or ring issue. At that point with process of elimination you know you have a stuck injector. You could try chevron fuel system cleaner or a bottle of seafoam in your tank and hope for best. Otherwise it will need to be replaced.
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