The 2003 Acura CL-S with manual transmission is known to experience misfiring issues across all cylinders, typically caused by ignition system failures, fuel delivery problems, or sensor malfunctions. Common symptoms include rough idle, loss of power, check engine light with multiple misfire codes (P0300-P0306), poor fuel economy, and engine hesitation. Below are comprehensive sections covering diagnosis, common causes, repair procedures, and preventative maintenance.
Key indicators of all-cylinder misfiring in the 2003 Acura CL-S manual transmission.
| Symptom | Description |
|---|---|
| Check Engine Light | Illuminated with codes P0300 (random misfire) and P0301-P0306 (cylinder-specific misfires) |
| Rough Idle | Engine shakes violently at idle, especially when cold |
| Power Loss | Significant reduction in acceleration and climbing ability |
| Poor Fuel Economy | MPG drops by 20-40% during misfiring episodes |
| Engine Hesitation | Stumbling during acceleration and throttle application |
| Exhaust Smell | Strong unburned fuel odor from exhaust system |
| Failed Emissions | High hydrocarbon readings during emissions testing |
Primary reasons for all-cylinder misfiring in the J32A2 3.2L V6 engine.
WARNING! Continuing to drive with severe misfiring can cause catalytic converter damage and engine overheating.
Systematic approach to identify the root cause of misfiring.
CAUTION! Always disconnect battery before performing electrical diagnostics.
Essential components and equipment for repair.
| Part/Tool | Specification |
|---|---|
| Spark Plugs | NGK IZFR6K11 or equivalent, gap 0.039-0.043 inch |
| Ignition Coils | OEM or high-quality aftermarket replacements |
| Fuel Filter | ACDelco GF627 or equivalent |
| Timing Belt Kit | Includes belt, tensioner, water pump |
| Sensors | OEM crankshaft and camshaft position sensors |
| Diagnostic Tool | OBD-II scanner with live data capability |
| Compression Tester | 0-300 PSI range with appropriate adapters |
| Fuel Pressure Gauge | 0-100 PSI range with Schrader valve adapter |
Basic procedure for addressing common misfiring causes.
Tip: Always use anti-seize compound on spark plug threads and dielectric grease on coil connections.
Regular maintenance to prevent future misfiring issues.
WARNING! Neglecting regular maintenance can lead to costly repairs and engine damage.
Approximate repair costs for misfiring issues.
| Repair | Parts Cost | Labor Cost | Total Estimate |
|---|---|---|---|
| Spark Plug Replacement | $60-100 | $100-150 | $160-250 |
| Ignition Coil Replacement | $200-400 | $150-200 | $350-600 |
| Fuel System Service | $100-200 | $150-250 | $250-450 |
| Sensor Replacement | $150-300 | $100-200 | $250-500 |
| Timing Belt Replacement | $300-500 | $400-600 | $700-1100 |
| Complete Diagnosis | N/A | $100-200 | $100-200 |
When to seek professional automotive service.
Contact: Acura Client Relations: 1-800-382-2238, www.acura.com
| Question | Answer |
|---|---|
| Can I drive with misfiring cylinders? | Limited driving only; extended operation can damage catalytic converter |
| How urgent is this repair? | High priority - should be addressed within 50-100 miles |
| Will misfiring damage my engine? | Yes, if left untreated - can cause overheating and internal damage |
| Can bad gas cause misfiring? | Yes, contaminated fuel is a common cause of multiple misfires |
| How long do repairs typically take? | Basic ignition repairs: 2-3 hours; comprehensive diagnosis: 4-6 hours |
Reset: Clear trouble codes after repairs using OBD-II scanner.
Technical Support: Acura Technical Service Bulletins available through dealerships