2006 random missfire code
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2006 random missfire code
Friend has a 2006 with the 4.6 motor. From time to time he gets a random misfire code ( I think its 0316).. He claims it will only do it when the gas tank is less that half full. I don't see any correlation between fuel level and the code. I am going to check fuel trim values, etc, when the code is set, this weekend.... all I can assume is low fuel pressure which sets the code... Anybody seen a problem with the pressure module or fuel pump / discharge hose that is related to low level in the tank ?
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From: 0,0,1
When the fuel is less than 1/2 a tank the pump is exposed to air. The fuel acts as a heat sink and keeps the pump running cooler. When worn pumps heat up they produce less pressure and result in lean conditions and misfires, especially under a load.
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Joined: Jan 2001
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From: Central NYS
I *think* the P0316 indicates random misfires within the first 1000 rpm s after start up.
Maybe a leaky check valve within the fuel pump.
You could try cycling the key between off and run a time or two to prime the fuel pump cranking the engine up. See if that keeps the code at bay.
Maybe a leaky check valve within the fuel pump.
You could try cycling the key between off and run a time or two to prime the fuel pump cranking the engine up. See if that keeps the code at bay.
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I put a new pump in it 2 years ago due to "fuel problems". Ran OK for quite a while after that.. Now he says it can run for WEEKS with no code and no problems.. let the level fall below half tank and he gets the code.. Fill up and the code goes away.. That's his story. I will try to get more info this weekend .... hate to think its the pump again.
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