Throttle Position Sensor (TPS) Guide for the 1991-1996 Buick Roadmaster
Solve common shifting problems and engine hesitation by choosing the right replacement throttle position sensor for your Roadmaster.
- A faulty TPS is a very common cause of transmission shifting problems on the 1991-1996 Roadmaster and should be checked before suspecting major transmission failure.
- Replacement is an easy DIY job that takes under 30 minutes and requires only basic tools.
- For a reliable repair, choose a trusted aftermarket brand like Delphi or Standard Motor Products, which offer OEM-level quality for less money.
- Ensure you buy the correct part for your specific model year, as the sensors for 1991-1993 and 1994-1996 are different.
Is Your Roadmaster Experiencing These Symptoms?
A failing throttle position sensor can cause a range of frustrating issues that often seem like a major transmission or engine problem. Because the TPS signal is used to control automatic transmission shifts, a bad sensor is a common cause of shifting problems on the 1991-1996 Roadmaster. Before suspecting a costly transmission repair, check for these common TPS failure symptoms:
🎬 Learn more about the common symptoms of a failing sensor.- Harsh or Delayed Transmission Shifting: The transmission may slam into gear, refuse to shift, or shift at the wrong RPMs.
- Engine Hesitation or Stumbling: When you press the gas pedal, the car may hesitate or bog down before accelerating.
- Poor or Erratic Idle: The engine might idle too high, too low, or surge up and down on its own.
- Sudden Surges in Speed: The car might unexpectedly speed up without you pressing the pedal further.
- Check Engine Light: A failing TPS will often trigger the Check Engine Light. Common codes include P0121, P0122, and P0123 on 1994-1996 models.
Choosing the Right Aftermarket TPS Brand
For a vehicle like the 1991-1996 Roadmaster, you don't need to buy an expensive OEM part from a dealer. Many aftermarket brands offer excellent quality at a much lower price. However, not all brands are created equal. Here’s a breakdown of quality tiers to help you choose.
Tier 1: OEM-Level Quality
These brands are often the original equipment manufacturers for General Motors or have a reputation for equivalent quality. They are a top choice for reliability.
- ACDelco: Traditionally the OEM supplier for GM. While some forum users have noted occasional issues with newer ACDelco parts, they are generally considered a reliable choice.
- Delphi: Another major OEM supplier for GM. Many mechanics and owners trust Delphi sensors for their durability and consistent performance, sometimes even preferring them over modern ACDelco parts.
Tier 2: Trusted Aftermarket Brands
These companies have a long history of producing reliable aftermarket parts and are a solid choice for a balance of price and quality.
- Standard Motor Products (SMP): A well-regarded brand that often manufactures parts to OEM specifications. Some of their products are even re-boxed OEM parts.
- NGK/NTK: Known for their high-quality sensors, NTK is the sensor division of NGK spark plugs and is a trusted name in engine management parts.
- Walker Products: A reputable manufacturer of fuel system and engine management components.
Tier 3: Value-Oriented Brands
These brands focus on affordability. They can be a good option for a budget repair, but may have a higher risk of premature failure or inconsistent performance compared to higher-tier brands.
- Dorman: Known for providing a wide range of aftermarket solutions, quality can sometimes be inconsistent for electronic parts.
- Replacement / Store Brands (e.g., Duralast, TRQ): These are often the most affordable option but can be a gamble on quality and longevity.
Cost of Replacing a Throttle Position Sensor
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Part | $24 - $70 |
| New OEM Part (GM/ACDelco) | $64 - $113+ |
| Shop Labor | $54 - $79 |
| Total Professional Replacement | $118 - $192 |
Frequently Asked Questions (FAQ)
Can I replace the Roadmaster's TPS myself?
Yes, this is a very simple job for a DIY mechanic. The sensor is located on the side of the throttle body, held by two Torx screws, and has a single electrical connector. The entire process usually takes less than 30 minutes with basic hand tools.
🎬 Watch this step-by-step guide to replacing your TPS like a pro.Does a new throttle position sensor need to be calibrated?
For the 1991-1996 Roadmaster, a specific calibration procedure with a scan tool is generally not required. The engine computer will typically "relearn" the new sensor's idle and wide-open throttle positions on its own after disconnecting the battery during installation or after a few drive cycles.
Are there any recalls for the Roadmaster TPS?
No, there are no specific recalls for the throttle position sensor on the 1991-1996 Buick Roadmaster. While GM has issued special coverage for TPS issues on much newer vehicles, it does not apply to this generation.
Why not just buy the cheapest TPS available?
While tempting, the cheapest sensors often use lower-quality internal components that can fail quickly or send an erratic signal to the computer, causing the same problems you were trying to fix. Investing a few extra dollars in a reputable brand like Delphi or Standard Motor Products can save you the headache of replacing the part again in the near future.
Helpful Videos
Technical Specifications
OEM Part Numbers: 17106681 17112404 213-918 17087655 213-894 17113070
The TPS for the Buick Roadmaster is a three-wire potentiometer sensor. It receives a 5-volt reference signal from the ECU, a ground, and sends back a variable voltage signal (typically ~0.5V at idle to ~4.5V at wide-open throttle) that corresponds to the throttle plate's angle.
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.
- Buick Roadmaster:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Roadmaster Experiencing These Symptoms?
- Choosing the Right Aftermarket TPS Brand
- Tier 1: OEM-Level Quality
- Tier 2: Trusted Aftermarket Brands
- Tier 3: Value-Oriented Brands
- Cost of Replacing a Throttle Position Sensor
- Frequently Asked Questions (FAQ)
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