Manifold Absolute Pressure (MAP) Sensor for 1980-1984 Chevrolet Impala
Everything you need to know before replacing the MAP sensor on your classic Impala.
- A failing MAP sensor on your 1980-84 Impala will cause poor running, bad fuel economy, and a Check Engine Light.
- Replacement is very easy and can be done by a DIYer in under 15 minutes.
- Always inspect and replace the small vacuum hose that connects to the sensor, as it can cause the same symptoms if it's old and cracked.
- Choosing a recognized aftermarket brand like Standard Ignition or Walker Products is recommended over economy brands for better reliability.
Symptoms of a Failing MAP Sensor
When the MAP sensor on your 1980-1984 Impala starts to fail, the engine's computer gets bad information. This can cause a number of problems. You might notice your "Check Engine" light comes on, which is the most common sign. Your car may also have a rough idle, hesitate or stumble when you accelerate, or even stall. Other signs include poor fuel economy, a lack of engine power, and black smoke coming from the exhaust, which indicates the engine is running too rich (too much fuel). Because other issues like vacuum leaks can cause similar symptoms, it's a good idea to check for cracked or loose vacuum hoses before replacing the sensor.
Choosing the Right Aftermarket Part
For a vehicle from the early 1980s, finding a new original equipment (OEM) part from GM is highly unlikely. The aftermarket is your primary source for a replacement MAP sensor. Quality can vary between brands, so it's important to choose wisely.
- Premium Aftermarket (Standard Ignition): Standard Ignition (also known as Standard Motor Products or SMP) is a well-regarded brand in the aftermarket. They manufacture a wide range of engine management components and often meet or exceed original specifications. While reviews can be mixed for any part, they are generally considered a reliable choice for a direct-fit replacement.
- Standard Aftermarket (Spectra, Walker Products): Brands like Spectra and Walker Products offer a cost-effective alternative. They are large manufacturers of aftermarket parts. Walker Products emphasizes that their sensors are tested and designed to meet OE standards. Spectra is also a major parts supplier, though some user reviews suggest that quality can sometimes be inconsistent on certain types of parts. For a simple sensor on an older vehicle, these brands often provide a perfectly adequate and affordable solution.
- Economy/Value (Global Parts): This brand falls into the economy category. While they provide a low-cost option, quality and longevity can be a gamble. For a critical sensor like the MAP, it's often worth spending a little more on a recognized brand to avoid having to do the job twice.
Pro Tip: Check the Vacuum Hose
The MAP sensor is connected to the intake manifold by a small rubber vacuum hose. Over 40+ years, this hose can become brittle, cracked, or clogged. A bad hose will cause the same symptoms as a bad sensor. Always inspect and replace this inexpensive hose when you replace the MAP sensor.
Replacement Cost
Replacing the MAP sensor is a relatively inexpensive repair. The parts themselves are affordable, and the labor is straightforward.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket MAP Sensor | $44.66 - $74.90 |
| Shop Labor | $50 - $100 |
| Total Estimated Cost (DIY) | $44.66 - $74.90 |
| Total Estimated Cost (Shop) | $95 - $175 |
Frequently Asked Questions (FAQ)
Where is the MAP sensor located on a 1980-1984 Impala?
The MAP sensor is typically a small, black plastic box mounted on the firewall or a fender wall in the engine bay. It will have a vacuum hose connecting it to the intake manifold and a 3-wire electrical connector.
Is this a difficult repair to do myself?
No, this is a very easy repair suitable for beginners. It usually involves unplugging the electrical connector, disconnecting the vacuum hose, and removing one or two small bolts that hold the sensor to its bracket. The entire process typically takes less than 15 minutes.
Can I just clean my old MAP sensor?
While you can try cleaning the port on the sensor with an appropriate electronic parts cleaner, it's often not a permanent fix. The internal electronics of the sensor are what usually fail over time due to heat and vibration. Given the low cost of a new part, replacement is the most reliable solution.
Are there any recalls for this part?
There are no specific recalls from the National Highway Traffic Safety Administration (NHTSA) for the MAP sensor on the 1980-1984 Chevrolet Impala. Any recalls for a vehicle of this age would have been issued decades ago.
Technical Specifications
Typically a 3-pin plastic sensor connected via a vacuum line to the intake manifold.
We Have This Part in Stock
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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