p0304 p0316
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p0304 p0316
A couple of weeks ago I got a check engine light. Pulling the codes I saw that it was a p0304 and sometimes a p0316. The first time this happened I check the spark plug cables and one was loose (cycylinder 4). Then last week my fuel pump died. since then I have gotten the two codes on a somewhat continous basis. I replaced the plugs (needed to anyway) and the problem did not go away. The odd thing is that the check engine light does not come on at idle. IT only comes on after the motor is at a higher rev. The replaced plugs looked pretty normal, but the cylinder 4 plug had some carbon deposits. any help would be appreciated. I am currently running injector cleaner in the gas. I may go ahead and replace the plug wires since the current ones are high mileage and it is not an expensive fix.
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replaced the wires
I replaced the plug wires and it is still the same. The cel light does not come on until after the engine has gotten to a certain rpm level. The escape has over 200K miles so I think I am going to replace the ignition coil (it can't hurt and is not horribly expensive) The information I have found about the code is that it relates to me having no spark. (the light blinks)
More Turbo
Joined: Dec 2013
Posts: 522
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From: Upstate NY
FWIW;
p0304 is a misfire on cylinder 4 and p0316 is a crank or cam shaft position sensor.
Not knowing the age or sub model/engine of any of the vehicles in question (I'll assume an 8-10 year old vehicle), I would first replace the coil packs and crank/cam position sensors.
If the problem is not seen until above a certain RPM, then I would start with the sensors. BUT... The coil packs can and do eventually fail due to heat stress, (potting material they are sealed with cracks letting in moisture). you can run with them if the average humidity in your part of the world is typically low. But if your part of the planet is commonly higher humidity, then the coils will not fire when expected allowing unburnt fuel in to the exhaust system and will lead to catalytic converter failure which is exactly what happened to my '02 escape.
Mine was a 3.0L so replacing them required pulling the intake manifold (not too difficult but DO replace the gaskets and be sure to cover the intake ports with a clean towel to keep small things like the coil mounting screws out of the engine) or have a trusted mechanic do it for you.
p0304 is a misfire on cylinder 4 and p0316 is a crank or cam shaft position sensor.
Not knowing the age or sub model/engine of any of the vehicles in question (I'll assume an 8-10 year old vehicle), I would first replace the coil packs and crank/cam position sensors.
If the problem is not seen until above a certain RPM, then I would start with the sensors. BUT... The coil packs can and do eventually fail due to heat stress, (potting material they are sealed with cracks letting in moisture). you can run with them if the average humidity in your part of the world is typically low. But if your part of the planet is commonly higher humidity, then the coils will not fire when expected allowing unburnt fuel in to the exhaust system and will lead to catalytic converter failure which is exactly what happened to my '02 escape.
Mine was a 3.0L so replacing them required pulling the intake manifold (not too difficult but DO replace the gaskets and be sure to cover the intake ports with a clean towel to keep small things like the coil mounting screws out of the engine) or have a trusted mechanic do it for you.
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rawdawg2
1983 - 2012 Ranger & B-Series
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Jul 25, 2008 08:17 PM
