The Buick fault code P0304 indicates a misfire in cylinder 4.
This affects the engine’s performance, causing symptoms like engine light on, lack of power, hard starting, and engine hesitation.
Common causes include a faulty spark plug, clogged fuel injector, or ignition coil issues.
While not an immediate danger, it can lead to further engine damage if left unresolved.
A possible fix involves inspecting and repairing the components related to cylinder 4, such as spark plugs, fuel injectors, and ignition coils, along with checking wiring harnesses and connectors for any damage.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms for Buick p0304
Engine misfires on cylinder 4 in a Buick with fault code P0304.
- With Buick fault code P0304, you may notice the Engine Light ON, indicating a misfire in cylinder 4.
- The vehicle might experience a lack or loss of power, especially during acceleration.
- You may encounter hard starting issues, where the engine struggles to start promptly.
- Engine hesitation can occur while driving, feeling like a momentary loss of power or surging.
Causes for Buick p0304
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Fault code P0304 on a Buick indicates a misfire in cylinder 4.
- A Buick P0304 trouble code can be caused by: Faulty Spark Plug #4.
- Clogged or faulty Fuel Injector #4.
- Faulty Ignition Coil #4.
- Fuel Injector #4 harness is open or shorted.
- Fuel Injector #4 circuit poor electrical connection.
- Ignition Coil #4 harness is open or shorted.
- Ignition Coil #4 circuit poor electrical connection.
- Insufficient cylinder 4 compression.
- Incorrect fuel pressure.
- Intake air leak.
Fix for Buick p0304
Address the misfire on cylinder 4 in a Buick by checking spark plugs and ignition components.
- To fix P0304, Review the possible causes mentioned above and visually examine the corresponding wiring harness and connectors.
- Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Check the spark plug for fouling or wear.
- Inspect the ignition coil for proper operation.
- Swap the ignition coil with another cylinder to see if the misfire moves.
- Replace the spark plug if necessary.
- Clear the fault codes and test drive the vehicle to verify the repair.
Description for Buick p0304
Buick fault code P0304 indicates a misfire in cylinder 4.
Code P0304 on a Buick indicates a misfire was detected in cylinder 4.
The Engine Control Module (ECM) triggers this code by monitoring crankshaft speed variations caused by the misfire in that specific cylinder.
The ECM uses input from the crankshaft position sensor to detect the misfire and set the P0304 code.
Tech Notes for Buick p0304
For Buick fault code P0304, refer to detailed diagnostic information for cylinder 4 misfire.
When dealing with a Buick OBDII fault code P0304, which indicates a misfire detected in cylinder 4, there are several steps you can take to diagnose and fix the issue.
Visual Inspection: Start by visually inspecting the ignition system components related to cylinder 4, such as spark plugs, ignition coils, and wiring.
Look for any signs of damage, wear, or corrosion.
Check Spark Plug: Remove and inspect the spark plug in cylinder 4.
Look for fouling, wear, or damage.
Replace the spark plug if necessary.
Ignition Coil Testing: Use a multimeter to test the ignition coil for proper resistance values.
Compare the readings to the manufacturer’s specifications.
Replace the ignition coil if it is out of spec.
Compression Test: Perform a compression test on cylinder 4 to check for any internal engine issues that could be causing the misfire.
Fuel Injector Inspection: Inspect the fuel injector for cylinder 4.
Check for proper operation and ensure it is delivering fuel correctly.
You can use a noid light to check for injector pulse.
Scan Tool Diagnostics: Use a scan tool to monitor live data and check
FAQ
Common causes of fault code P0304 in a Buick include faulty spark plug #4, clogged fuel injector #4, faulty ignition coil #4, or issues with wiring/connectors.
Diagnose P0304 misfire in Buick: Check spark plug, fuel injector, ignition coil #4. Inspect wiring for damage, poor connections. Fix as needed.
It is not safe to continue driving with fault code P0304 on your Buick. Check and repair faulty spark plug, fuel injector, or ignition coil on cylinder 4.
