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P0303 cyl #3 misfire code driving me crazy


Old 03-29-2011, 11:44 AM
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Join Date: Feb 2010
Posts: 30
P0303 cyl #3 misfire code driving me crazy

I have a obd2 P0303 cyl #3 misfire code ,changed plugs,changed wires ,swapped coil temporarily for one i know is good , this is on V-6 auto continuous check engine flashing- car runs fine drives good then irradic idle and will stall in gear. At other times it runs and idles smooth? changed IAC , still the same ,checked for vaccuum leaks can't find any?
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Old 03-29-2011, 12:27 PM
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Join Date: Oct 2005
Location: MI
Posts: 25,637
Flashing MIL means just one thing, - she's missing. Fuel first, then ignition. Change the Fuel filter lately ? What's the pump pressure reading?
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Old 03-29-2011, 04:23 PM
Join Date: Mar 2011
Location: Low Country, South Carolina
Posts: 39
Mine did this too except im a 5.4L. When she is missing on one cyl the truck idles a little rough but will not stall. Once I changed the coil and plug she runs smooth but when i pull up to a stop light the idle will jump and fall and eventually the engine would die. This went on for a month or two until the coil fouled out again so i havent done anything to fix it yet. There is a grounding wire that screws into the fire wallthat let the water drain in and drip down on top of the COP that i have fixed with a lil silicone. I would rather it always run a lil run rough than cut off on me every time i stop so i havent replaced the COP.
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Old 03-30-2011, 12:40 PM
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Join Date: Feb 2010
Posts: 30
it has about 30psi on the fuel rail , could a single bad/clogged injector be causing the problems? is 30 psi enough or is there a fuel pump problem ? thank you in advance for any help

Last edited by cwthill; 03-30-2011 at 12:42 PM.
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