A Guide to the Engine Camshaft Position Sensor for the 1997-2002 Pontiac Firebird
Solve stalling and starting problems in your Firebird by understanding this critical engine sensor.
- The replacement job is simple on the 3.8L V6 but very difficult and labor-intensive on the 5.7L LS1 V8.
- Symptoms include hard starting, stalling, rough idle, and a Check Engine Light with codes P0340-P0343.
- For the V8, it is highly recommended to use a premium OEM-quality brand like Delphi or AC Delco to avoid repeat repairs.
- There are no recalls from Pontiac for this specific part on the 1997-2002 Firebird.
Symptoms of a Failing Camshaft Position Sensor
When the camshaft position sensor starts to fail, the engine's computer gets unreliable information. This can cause a variety of noticeable problems. You might experience these issues intermittently at first, but they will likely become more frequent as the sensor degrades.
- Check Engine Light: This is often the first sign. The computer will store a trouble code, typically in the P0340 to P0349 range.
- Hard Starting or No Start: The engine may crank for a long time before it starts, or it may not start at all. This happens because the computer doesn't know when to fire the spark plugs.
- Engine Stalling: The engine may suddenly shut off while driving, which can be dangerous. This can happen without warning.
- Rough Idle and Poor Performance: You may notice a shaky idle, hesitation when you accelerate, backfiring, and a general lack of power. 🎬 Watch: How to test and fix common sensor symptoms
- Reduced Fuel Economy: With incorrect timing, the engine burns more fuel than necessary.
Choosing the Right Aftermarket Sensor
The original sensor on your Firebird was made by AC Delco. When choosing a new aftermarket part, quality matters. A cheap, low-quality sensor can fail quickly, leaving you with the same problems. For a critical part like this, it's best to choose a brand known for reliability.
- Top Tier (OEM Quality): Brands like Delphi are an excellent choice. Delphi was an original equipment supplier for GM, and their parts are often identical to the AC Delco part, sometimes at a lower price. They are widely trusted for their quality and durability.
- Mid-Tier (Reputable Aftermarket): Brands such as Standard Ignition (SMP), NGK, and Hitachi have a long history of making quality electronic components. These are generally a solid choice and a good balance between price and performance.
- Value Tier: Brands like Dorman, URO Parts, and other lower-priced options offer a cost-effective solution. While they are designed to be direct replacements, some owners report a shorter lifespan compared to OEM or top-tier brands. They can be a viable option if budget is the primary concern.
Pro Tip: For the LS1 V8 engine, the labor to replace the sensor is very high. To avoid doing the job twice, it is strongly recommended to use a Top Tier brand like Delphi or an original AC Delco part.
Cost to Replace the Camshaft Position Sensor
| Category | Estimated Cost |
|---|---|
| New Aftermarket Part | $27 - $179 |
| Shop Labor | $100 - $550+ |
| Total Job Cost (at a shop) | $127 - $729+ |
Note: Labor costs vary significantly based on which engine you have. The 5.7L V8 is much more expensive to work on than the 3.8L V6 for this specific part.
Frequently Asked Questions (FAQ)
Where is the camshaft position sensor located on my Firebird?
The location is completely different depending on your engine. For the 3.8L V6, the sensor is located on the front timing cover, behind the power steering pump. For the 5.7L LS1 V8, the sensor is at the very back of the engine block, underneath the rear of the intake manifold.
🎬 Watch: A guide to replacing the LS camshaft sensorCan I replace this sensor myself?
For V6 owners: Yes, this is a manageable DIY job for someone with basic tools and mechanical skill. Access is tight, but it does not require major disassembly.
For V8 owners: This is a difficult DIY job. It requires removing the entire intake manifold to access the sensor. This is a 4-6 hour job for an experienced mechanic and not recommended for beginners.
What happens if I don't replace a bad sensor?
You will continue to have performance problems like stalling, hard starting, and rough running. The most significant risk is the engine stalling in traffic, which can lead to an accident. Ignoring the issue will not cause major internal engine damage, but it makes the car unreliable and unsafe to drive.
Is there a recall for the camshaft position sensor on my Firebird?
No, there are no specific recalls or widespread Technical Service Bulletins (TSBs) from GM or the NHTSA for the camshaft position sensor on the 1997-2002 Pontiac Firebird.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12561211 19420911
This is a 3-pin Hall effect sensor. The part is different for the 3.8L V6 and the 5.7L V8 engines. Ensure you purchase the correct part for your specific engine.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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