4.6 misfire on #6
#1
#7
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#8
I'd sure try a new plug and wire in #6 at the very least. The P0306 is the clue there. You still haven't identified the brand of plugs, and are they OEM wires or aftermarket, and if aftermarket, what brand?
Not trying to give you a hard time, but you aren't answering the questions. Non-Motorcraft plugs and wires often don't last as long as OEM or can cause problems - just read some threads here to see what kind of luck people are having with Bosch plugs in Ford truck engines..........
Not trying to give you a hard time, but you aren't answering the questions. Non-Motorcraft plugs and wires often don't last as long as OEM or can cause problems - just read some threads here to see what kind of luck people are having with Bosch plugs in Ford truck engines..........
#9
You are taking things a bit to simplistic.
The 306 code is a monitor telling you that cylinder is misfiring.
The causes can be a fuel injector, a plug, a wire or a coil pak.
The 231 code is a monitor and command of the fuel pump circuit.
Many places a failure can occurr.
The 1000 code is telling you one or more diagnostic tests have failed to complete and clear all flags. Emmision's testing looks at these for a pass or fail and sticker issueing.
This happens when you clear codes, power down the PCM and when insufficient drive cycles have been made so all tests have a chance to run to completion and when a fault is present that fails the peticular diagnostic during the drive cycles.
Fix the 306 cause then the 231 cause, then the drive cycles will clear the 1000 code after all drive condition have been met.
This is why I stated the first line as I did.
Good luck.
The 306 code is a monitor telling you that cylinder is misfiring.
The causes can be a fuel injector, a plug, a wire or a coil pak.
The 231 code is a monitor and command of the fuel pump circuit.
Many places a failure can occurr.
The 1000 code is telling you one or more diagnostic tests have failed to complete and clear all flags. Emmision's testing looks at these for a pass or fail and sticker issueing.
This happens when you clear codes, power down the PCM and when insufficient drive cycles have been made so all tests have a chance to run to completion and when a fault is present that fails the peticular diagnostic during the drive cycles.
Fix the 306 cause then the 231 cause, then the drive cycles will clear the 1000 code after all drive condition have been met.
This is why I stated the first line as I did.
Good luck.
#11
#12
My first thought on backfire on this engine type is a possible low fuel pressure condition assuming no other faults.
This tends to explain the easy starting and idle but not enough fuel for power.
Test the fuel pressure. It should be found somehwre in the 38 to 40 psi range and not fall with acceleration.
Possible a fuel filter needs changing or water in the gas, fuel pump etc.
Back fire can be the results of very lean conditions making the combustion very quick and very late or early to the point the cylinder can either combust in the intake tract or the exhaust tract before the valve closes.
On this type engine with the ignition so precision, it can't be the results of timing but of fuel conditions or if the cam chain drive were to slip a tooth altering valve timing in relation to the ignition. The cam position sensor would be triggered at the wrong time also.
Just some thoughts..
This tends to explain the easy starting and idle but not enough fuel for power.
Test the fuel pressure. It should be found somehwre in the 38 to 40 psi range and not fall with acceleration.
Possible a fuel filter needs changing or water in the gas, fuel pump etc.
Back fire can be the results of very lean conditions making the combustion very quick and very late or early to the point the cylinder can either combust in the intake tract or the exhaust tract before the valve closes.
On this type engine with the ignition so precision, it can't be the results of timing but of fuel conditions or if the cam chain drive were to slip a tooth altering valve timing in relation to the ignition. The cam position sensor would be triggered at the wrong time also.
Just some thoughts..
#13