Engine code p0304

If the engine speed fluctuates enough to cause the Crankshaft Position sensor signal to vary, the Engine Control Module can determine that a misfire is occurring. This code will trigger the check engine light as follows: The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The Misfire monitor diagnostic is based on variation in crankshaft velocity.

The PCM determines this information using the crankshaft position sensor and camshaft position sensor. Astral Auto Repairs 18views. There are a number of things that I could start changing from what I have read but would rather get some sound advice.

The PCM has detected a misfire from cylinder number 4. The PCM uses crankshaft position, camshaft position, and engine RPM to calculate fuel delivery and ignition timing. L Vengine , about 150KM on it. While driving home, the whole vehicle started to shake violently, and the engine light came on (flashing).

I drove it home to the garage and have been troubleshooting the problem since then. My truck had been experiencing rough idle and some hesitation for a couple of weeks. While on the highway it got a lot worse, and the check engine light came on.

The check engine light (CEL) will be on. Engine coolant temperature more than 56°C (132°F). An important thing to understand when finding the location of Cylinder is that it’s going to be the 4’th cylinder in the firing order of the vehicle, and not the 4’th cylinder that you might see when looking at the engine.

His mechanic says it may be a stuck ring? Im thinking bad intake manifold gaskets. I had the same issue with my Tahoe and it turned out to be manifold gaskets.

Ontario Canada) last month (0km ago) with readings of 0! Flashing light means you have a misfire that may damage the cat. The engine temperature may be cold but report as hot, or may be hot and report as cold. The engine cooling fan operation will also be negatively affected and may turn on and off at inappropriate times.

The computer can also normally identify the specific cylinder in which the misfire has occurred. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. If the problem persists more tests needs to be done to diagnose problem, see Possible Causes. So the whole front of the engine is randomly misfiring and I am stumped. Where is the best place online to buy the coil pack?

Do I need to replace my Osensor as well? Any help would be greatly appreciated. CEL it has not come on , yet runs a little. Hello all, I ran a diagnostic today right after my check engine light went on.

I figure it might be a spark plug. A garage and the Ford dealer cannot detrmine cause. Check it cold before you start the engine right at the rad cap.

Bigger hg leaks will usually cause a more constant misfire and set more. All a flashing check engine light for a misfire means that the misfire was bad enough to cause damage to the cat convertor. This originally started as a Knock Sensor CEL code thread titled High-pitched whine, jerky acceleration, rough idle, check engine light.

The first place to start is your spark plugs. Some days it drives excellant. The ECU monitors the operation of all cylinders to ensure they are all firing on time, so when one misfires repeatedly, a Check Engine Light is set. Using the firing order, identify the offending cylinder and remove the bolt holding the coil pack. I was driving, and suddenly my check engine light came on, the engine started to run rough.

So I pop the hood again an push on the wire heads connected to the engine to find out that the wire going to cylinder was off the plug again(2nd time this happened). However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired. Ive changed out plugs and wires, put in new coils also.

Community, Guest There are many great features available to you once you register at RennTech. I had been getting a Misfire in Cyl code. It would only do it when the engine was cold. When is the code detected?

The control module monitors the crankshaft speed and has detected a misfire condition. A good ground connection is also extremely important. Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder. My guess is the wires or plugs could be ba gap could be off, wires could be cracke coil could be going bad. I recently replaced the plugs and wires hoping the CEL would go away, but it has not.

I have reset the codes as well, but the CEL eventually comes back on with the same codes.

There will be no other DTCs or drivability symptoms present. Interchanged the coil pack with another cylinder and cleared the code but the code returned the same which one would think eliminates the coil pack as the problem. That blog was about the disappearance of the bulletin for replacing the intake manifold to help repair the issue.

Hey guys I am new to the forum. I have noticed by accident that there is a crack in the exhaust manifold right under where cylinder is, and air gets out from it. DODGE DAKOTA FORUM - FORUM AND OWNERS CLUB!

A few weeks ago I had a rough idle at start-up and all of the CELs. He replaced the coil with an aftermarket bran changed the plugs (due anyway), and added some injector cleaner. If you have a scanner and it shows one cylinder misfiring you just have to concentrate on that cylinder.