1980-1989 Buick Skyhawk Coolant Temperature Sensor: A Comprehensive Guide
Understanding the small sensor that makes a big difference in your Skyhawk's engine performance and fuel economy.
- Confirm you are buying the two-wire ECT sensor for the computer, not the one-wire sender for the gauge.
- Symptoms like poor fuel economy and black exhaust smoke strongly point to a failed sensor causing a rich fuel condition.
- For this vehicle, a quality aftermarket brand like 'Replacement' is a cost-effective and reliable choice as OEM parts are likely unavailable.
- Replacement is a simple DIY task that can be done in under 30 minutes with basic tools.
Is it the Sensor or the Sender?
A common point of confusion on 1980s GM vehicles like the Skyhawk is the difference between the temperature sensor and the temperature sender. They are two different parts with distinct jobs. The Engine Coolant Temperature (ECT) Sensor, which this guide covers, has a two-wire connector and communicates directly with the engine's computer to control performance. The temperature sender, on the other hand, usually has a single wire and its only job is to operate the temperature gauge or warning light on your dashboard. If your gauge is acting up but the engine runs fine, the sender is likely the problem. If the engine is running poorly, the sensor is the probable cause.
Symptoms of a Failing Coolant Temperature Sensor
When the ECT sensor fails, it typically sends a false signal to the engine's computer, telling it the engine is cold even when it's fully warmed up. This leads to several noticeable problems:
- Poor Fuel Economy: This is the most common symptom. The computer will enrich the fuel mixture, causing the engine to use more gas than necessary.
- Black Smoke from Exhaust: A rich fuel mixture can result in unburned fuel exiting through the exhaust, appearing as black smoke.
- Rough Idle: The engine may idle roughly, shake, or hesitate because the air-fuel mixture is incorrect.
- Engine Overheating: In some cases, a bad sensor can prevent the electric cooling fans from turning on at the correct temperature, leading to overheating.
- Check Engine Light: A faulty sensor can trigger the "Check Engine" light on the dashboard.
Common Ordering Mistake
Before ordering, verify that you are replacing the two-wire ECT sensor for the engine computer, not the one-wire sender for the dashboard gauge. They are not interchangeable. Checking the number of pins on your current part's electrical connector is the best way to ensure you order the correct component.
Choosing the Right Aftermarket Sensor
For a vintage vehicle like the 1980-1989 Skyhawk, original OEM parts from GM or ACDelco are often discontinued and difficult to find. The good news is that aftermarket brands provide a reliable and affordable solution. Brands like Replacement offer direct-fit sensors that meet original specifications. Given the simplicity of this sensor's technology, a quality aftermarket part is a perfectly acceptable choice to get your Skyhawk running properly again without a difficult search for a rare original part.
| Part Type | Price Range |
|---|---|
| New Aftermarket (e.g., Replacement) | $18.79 |
| Shop Labor | $50 - $120 |
Installation Tip
The ECT sensor is typically located on the intake manifold near the thermostat housing. It has a two-wire electrical connector. When installing the new sensor, avoid using extra thread sealant. The sensor often grounds through its threads, and sealant can interfere with this connection, causing incorrect readings.
Frequently Asked Questions (FAQ)
Where is the coolant temperature sensor located on my Skyhawk?
On most 1.8L and 2.0L engines used in the Skyhawk, the ECT sensor is screwed into the intake manifold, close to the thermostat housing. Look for a small sensor with a two-prong electrical plug.
Can I replace this sensor myself?
Yes, this is a great job for a DIY mechanic. It requires only basic hand tools, like a wrench or deep socket. The process involves letting the engine cool, unplugging the connector, unscrewing the old sensor, and installing the new one. Some coolant may leak out, so be prepared to top it off afterward.
Are there any recalls for the Skyhawk's coolant sensor?
No, a search of the National Highway Traffic Safety Administration (NHTSA) database shows no recalls or technical service bulletins (TSBs) specifically for the coolant temperature sensor on the 1980-1989 Buick Skyhawk. Any failure is typically due to the age of the component.
What happens if I don't replace a bad sensor?
Continuing to drive with a bad ECT sensor will lead to very poor fuel mileage, increased engine wear from the rich fuel mixture washing oil from cylinder walls, and potential overheating issues. It can also lead to failed emissions tests. For the low cost of the part, it's best to replace it as soon as it's diagnosed as faulty.
Technical Specifications
OEM Part Numbers: 10045847 213310 213928 15326386
Connector: 2-prong male terminal
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.
- Buick Skyhawk: