Replacing the Catalytic Converter on Your 1987-1990 Mitsubishi Van
Everything you need to know before you buy a new aftermarket catalytic converter for your classic Mitsubishi Van.
- A loss of power is the number one symptom of a clogged catalytic converter on this van.
- OEM parts are not a realistic option; you will be buying an aftermarket brand.
- MagnaFlow is a premium choice for longevity, while Walker and AP/Eastern are more budget-friendly options.
- Before replacing the converter, find and fix the root cause of the failure to avoid damaging the new part.
Is Your Van's Catalytic Converter Failing?
On a vehicle like the 1987-1990 Mitsubishi Van, a failing catalytic converter gives clear physical symptoms. Because these vans are from before the advanced OBD-II diagnostic systems, you need to rely on what you can see, hear, and feel. A bad converter can't be ignored, as a complete blockage can stop your engine from running entirely.
Signs of a Bad Catalytic Converter
- Loss of Power: This is the most common sign. If your van feels sluggish, struggles to get up to speed, or hesitates when you press the gas, the converter could be clogged. A clog acts like a potato in the tailpipe, preventing exhaust from escaping and choking the engine.
- Rattling Noises: If you hear a rattling sound from under the vehicle, especially on startup or when accelerating, it's likely the ceramic honeycomb inside the converter has broken apart. Those loose pieces are bouncing around inside the metal casing.
- Rotten Egg Smell: A strong smell of sulfur or rotten eggs from the exhaust is a classic sign of a bad converter. It means the converter is no longer able to properly process the trace amounts of sulfur in gasoline.
- Poor Fuel Economy: If you're filling up more often, a clogged converter could be the cause. Your engine has to work much harder to push exhaust gases through the blockage, which burns more fuel.
Why Did My Converter Fail?
Catalytic converters don't usually fail on their own. Failure is often a symptom of another problem. Common causes include engine misfires, burning oil or coolant, or a bad oxygen sensor. Before installing a new converter, it's critical to diagnose and fix the root cause, or you will likely ruin the new one.
Choosing the Right Aftermarket Converter
For a vehicle from this era, finding a new original equipment (OEM) catalytic converter from Mitsubishi is nearly impossible. Aftermarket parts are your only realistic option. The good news is that several brands make direct-fit converters that bolt into place without welding. The main difference between them is price, materials, and build quality.
Aftermarket Brand Tiers
Your choice of brand often comes down to budget versus longevity and quality.
| Brand Tier | Brands | Description |
|---|---|---|
| Premium / Performance | MagnaFlow, MagnaFlow Performance Exhaust | Often considered a higher-quality option, typically using stainless steel construction and better welding techniques. They may offer a slight performance benefit due to better exhaust flow. These are usually the most expensive aftermarket choice but offer the best longevity. |
| Standard Replacement | Walker Exhaust | Walker is a well-known brand for standard, OE-style replacements. They are a common choice for drivers looking for a functional part at a mid-range price. Some users in forums have noted concerns about fitment or lifespan on other vehicles, but they remain a popular option. |
| Economy | AP Exhaust, Eastern Catalytic | These brands provide the most budget-friendly options. They are designed to be a functional, low-cost solution to get your van back on the road. Fitment might occasionally require minor adjustments, and their lifespan may not match that of premium brands. |
Check Your Local Laws
Some states, like California and New York, have very strict emissions laws and require converters that meet specific CARB (California Air Resources Board) standards. Always verify that the part you are buying is legal for use in your state.
Frequently Asked Questions (FAQ)
Are there any recalls for the 1987-1990 Mitsubishi Van catalytic converter?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls or technical service bulletins (TSBs) specifically for the catalytic converter on the 1987-1990 Mitsubishi Van. Any issues you experience are likely due to the age and mileage of the vehicle.
Can I install a catalytic converter myself?
If you purchase a "direct-fit" model, installation is possible for a DIY mechanic with the right tools. The job involves unbolting the old converter and bolting in the new one. However, the bolts are often rusted solid and can be very difficult to remove. If you buy a "universal" converter, it will require cutting and welding, which should be left to a professional exhaust shop.
What's the difference between a direct-fit and universal converter?
A direct-fit converter is designed to bolt directly onto your specific vehicle with no modifications. A universal converter is a generic part that must be welded into your existing exhaust pipe by a professional. For this van, direct-fit options are available and are highly recommended for an easier installation.
Will a new converter fix my power and fuel economy issues?
Yes, if the old converter was clogged, replacing it will restore lost power and improve fuel economy. A clogged converter physically restricts the engine's ability to breathe. A new, clear converter removes that restriction, allowing the engine to perform as it should.
Technical Specifications
This vehicle requires a three-way catalytic converter. Both direct-fit and universal options are available, though direct-fit is strongly recommended for easier installation. Ensure the selected part is compliant with your state's emissions laws (Federal EPA or CARB).
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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