Isuzu Impulse Serpentine Belt Replacement Guide (1987-1992)
Everything you need to know about choosing the right new serpentine belt for your 1987-1992 Isuzu Impulse.
- Verify your engine size and A/C configuration before ordering a new belt.
- Squealing noises are the first sign of a problem; don't ignore them.
- Gates, Continental, and Dayco are all reputable aftermarket brands.
- While replacing the belt, it is wise to also inspect or replace the tensioner pulley.
Signs of a Failing Serpentine Belt
A serpentine belt is a wear item, meaning it needs to be replaced over time. For the 1987-1992 Isuzu Impulse, there are no specific recalls or technical service bulletins (TSBs) for premature belt failure, which means you should watch for normal signs of wear. Ignoring these signs can lead to the belt breaking, causing a loss of power steering and the engine to overheat.
- Squealing or Chirping Noises: This is the most common symptom. A high-pitched squeal, especially on startup or during sharp turns, often means the belt is slipping because it's old, worn, or not tensioned correctly.
- Visible Wear and Tear: Look at the belt itself. If you see cracks, fraying, missing chunks, or a shiny, glazed appearance on the ribbed side, it's time for a replacement.
- Power Steering or A/C Failure: If your steering suddenly becomes very heavy or the A/C stops blowing cold air, the belt might be slipping badly or may have already snapped.
- Engine Overheating: The serpentine belt often drives the water pump. If the belt fails, the pump stops circulating coolant, and your engine's temperature will rise quickly.
- Battery Warning Light: A slipping or broken belt can't properly spin the alternator, which charges the battery. This will cause the battery light on your dashboard to illuminate. 🎬 Watch: 6 common signs of a failing drive belt
Choosing the Right Aftermarket Serpentine Belt
Since the Isuzu Impulse is a vintage vehicle, original equipment (OEM) belts are likely unavailable. The aftermarket offers excellent, and often the only, options. The key is choosing a quality brand. For your Impulse, you will find belts from Gates, Dayco, and Continental.
Aftermarket Brand Quality
| Brand | General Reputation & Notes |
|---|---|
| Gates | Often considered a top-tier choice by mechanics and DIYers. Known for durability and precise fit. Many trust Gates for critical components like timing and serpentine belts. |
| Continental | Also a highly-regarded brand. They produce the Elite series (formerly Goodyear Gatorback), which has a unique helical cog design specifically to help reduce or eliminate squeaking on drives that are prone to noise. |
| Dayco | A solid, reliable choice that has been making belts for over a century. While some users in forums have noted they may not last as long as Gates in some applications, they are a dependable and widely available option. |
Pro Tip: Belt noise is often caused by incorrect tension or misaligned pulleys, not just the belt itself. When replacing your belt, inspect the tensioner and pulleys for wobble or noise and replace them if necessary.
🎬 See how to properly inspect your belt tensionersCommon Ordering Mistakes
The 1987-1992 Isuzu Impulse came with different engines (like the 1.6L, 2.0L, and 2.3L) and options. The most common mistake is ordering the wrong length belt. Some models have different belt routings depending on whether they are equipped with air conditioning. Always verify your engine size and A/C option before ordering to ensure you get the correct part.
Frequently Asked Questions (FAQ)
How often should I replace the serpentine belt on my Impulse?
For an older vehicle, a good rule of thumb is to inspect the belt at every oil change and replace it every 4-5 years or 40,000-50,000 miles, regardless of appearance. Rubber degrades over time, not just with mileage.
Is it difficult to replace the serpentine belt myself?
For a DIYer with basic tools, it's a manageable job. The Impulse models from this era typically use a manual tensioner, which requires loosening the pulley bolt and then an adjuster bolt to release tension. The key is to make a diagram or take a picture of the belt routing before you remove the old one.
🎬 Watch this walkthrough on how to replace a serpentine beltShould I replace the tensioner at the same time?
It's highly recommended. The tensioner pulley and the spring or adjustment mechanism can wear out, leading to improper belt tension and noise. Replacing it with the belt is good preventative maintenance and ensures the new belt will perform correctly.
What does EPDM mean on a belt?
EPDM (Ethylene Propylene Diene Monomer) is a modern, durable synthetic rubber used in most quality aftermarket belts. It resists heat, ozone, and cracking much better than older neoprene belts, leading to a longer service life.
Helpful Videos
![Symptoms of a Bad Serpentine Belt [With Proven Fixes]](https://img.youtube.com/vi/fMV8lpFhJpM/mqdefault.jpg)
Technical Specifications
Belt length and rib count vary by engine (1.6L, 2.0L, 2.3L) and accessory options (with or without A/C). Most modern replacement belts are made from durable EPDM rubber.
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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.
- Isuzu Impulse: