Misfire P0304 and shaking ford check engine light focus 2... (2025)

Misfire P0304 and shaking ford check engine light focus 2... (1)×

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asked by

Marcin N

onOctober 28, 2016

Cold engine everything OK. Warm start shaking on idle. Shaking is increasing and becoming ok. injector been cleaned ultrasoud . Changed plugs, vt leads, coil. Can't see so far drop of power

My car has 70000 miles.
My car has a manual transmission.

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Misfire P0304 and shaking ford check engine light focus 2... (8)

Mark O. Adams

Automotive Mechanic

35 years of experience

Hi there. From the description you have provided, your vehicle’s P0304 misfire needs to be properly diagnosed since replacing components is not working. It could be low compression in that cylinder. This could account for not feeling the miss cold.

Increased RPM can overcome slightly low compression. A compression test should be performed, to rule out a mechanical failure. It could also be a faulty fuel injector electrically failing with increased temperature.

Resistance increases with an increase in temperature. It could be a poor electrical connection again, showing up with increased temperature. Circuit tests should be performed. I recommend having you vehicle’s Check Engine Light diagnosed and repaired by a certified technician, such as one from YourMechanic.

FordCheck Engine LightFocus2010MisfireL4-2.0LshakingP0304

The statements expressed above are only for informational purposes and should be independently verified. Please see ourterms of servicefor more details

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Misfire P0304 and shaking ford check engine light focus 2... (2025)

FAQs

Misfire P0304 and shaking ford check engine light focus 2...? ›

The P0304 code stands for “Cylinder 4 Misfire Detected”, which means your vehicle's cylinder 4 has misfired enough times for your powertrain control module (PCM) to notice. A worn spark plug, a faulty fuel injector, and a leaking valve are some possible causes of the P0304 code.

How serious is a cylinder 4 misfire? ›

If you do not fix whatever is causing the cylinder not to fire, it may cause serious and irreversible damage to your catalytic converter or engine, which are two of the most expensive parts to replace. Additionally, a car that is not firing on all cylinders may be inherently more dangerous to drive.

What is the most common cause of P0304 code? ›

What is the most common cause of the P0304 code? The most common cause for this error code is a malfunctioning spark system.

Can you drive with a P0304 code? ›

Can I Drive My Car With This Issue? Due to the possibility of severe engine and catalytic converter damage, the P0304 error code should be remedied immediately.

What happens if I keep driving with a cylinder misfire? ›

The longer you ignore the problem and drive the vehicle in spite of the misfire, the more likely it is that your engine will suffer serious damage. A misfire on its own does not usually signal a serious mechanical problem. Very often, it is just a spark plug, ignition coil or a fuel injector that needs to be replaced.

How long does it take a misfire to damage the catalytic converter? ›

Any raw fuel in the catalytic converters quickly overheats them and leads to their destruction. If misfires occur severely then damage occurs quickly. If misfires are subtle, then damage may not occur for a year or two. When damage does occur expect to pay a lot to fix it.

What are the symptoms of a bad coil pack? ›

8 Signs of a Faulty Ignition Coil
  • Your Car Guzzles Gas. ...
  • Your Car Feels Slow. ...
  • You Hear Spluttering, Coughing, and Banging Noises. ...
  • Your Car Idles Roughly and Vibrates. ...
  • Your Car Misfires and Backfires. ...
  • Your Car Stalls. ...
  • You Struggle to Start Your Car. ...
  • The Check Engine Light Is On.
Feb 3, 2023

Will a misfire go away? ›

A misfire will not normally go away on its own. Instead, the damage compounds.

How long can you drive with a misfiring coil? ›

In most automobiles, you could theoretically travel thousands of miles with a misfiring cylinder. The engine's other cylinders will continue to produce power. So, even if you shake and stall along the wall (and don't acquire much speed or acceleration), the car will still operate.

Can low oil cause misfire? ›

Engine misfires are caused by many things, including: Dirty, broken or worn-out spark plugs. Low oil pressure (injector clogging) and/or overheating issues.

Can bad fuel injectors cause P0304 code? ›

The P0304 code stands for “Cylinder 4 Misfire Detected”, which means your vehicle's cylinder 4 has misfired enough times for your powertrain control module (PCM) to notice. A worn spark plug, a faulty fuel injector, and a leaking valve are some possible causes of the P0304 code.

How much does it cost to fix a cylinder 4 misfire? ›

Depending on the misfire's cause, the repair and replacement cost might range between $100 and $1,000.

What type of misfire is most severe? ›

The type "A" misfire is the most serious condition and indicates impending catalyst damage. If detected, the Malfunction Indicator Lamp (MIL) may flash once per second to alert the driver that immediate service is required.

Is it bad to have a 4-cylinder engine? ›

4-cylinder engines tend to be fuel-efficient and are a great buy if you are looking for a small and reliable car. 4-cylinder engines have less of an impact on your carbon footprint than a 6-cylinder engine. 4-cylinder engines are commonly found in smaller, compact cars, which are easier to maneuver and park.

How hard is it to fix a misfire cylinder? ›

Usually, fixing a misfire is a pretty straightforward repair. However, there could be a deeper issue causing it, so it's always a good idea to have a professional mechanic look under your hood.

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