Jeep Comanche Ignition Coil: A Guide for 1986-1992 Models
Everything you need to know about choosing the right replacement ignition coil for your Jeep MJ.
- A no-spark condition on a Comanche is often caused by a bad Crankshaft Position Sensor (CPS), not the coil. Test the CPS first.
- For most owners, a reliable OEM-quality brand like Standard Ignition, Delphi, or Bosch is a better choice than a performance coil.
- The replacement is very easy and can be done in under 30 minutes with basic tools.
- Always inspect the coil's electrical connector for damage or corrosion, as this is a common failure point.
Signs of a Failing Ignition Coil in a Jeep Comanche
A bad ignition coil on these Jeeps usually makes itself known. Because the 1986-1992 Comanche uses a single coil for the entire engine, a failure will affect all cylinders. Watch out for these common symptoms:
- No-Start or Hard Starting: The engine cranks but won't fire up, or takes a long time to start. This is a classic sign the coil isn't producing any spark.
- Engine Misfires and Rough Idle: Your truck may shake, shudder, or run poorly, especially when stopped at a light. 🎬 See this guide on diagnosing and fixing a Jeep engine misfire.
- Stalling: The engine might cut out unexpectedly while driving or when coming to a stop.
- Loss of Power: Acceleration feels sluggish, and the truck struggles to get up to speed because the spark is too weak for proper combustion.
- Worse Fuel Economy: An inefficient spark means unburnt fuel, forcing your engine to use more gas than usual.
A Note on "No-Spark" Issues
While the ignition coil can fail, a "no-spark" condition on 1987-1990 "Renix" era Jeeps is very often caused by a faulty Crankshaft Position Sensor (CPS). Many owners replace the coil only to find the real problem was the CPS. It's wise to test the CPS before replacing the coil. 🎬 Watch: How to test a Renix era ignition coil and sensor. Poor engine grounds are another common culprit for ignition problems on these older Jeeps.
Choosing the Right Aftermarket Ignition Coil
Finding a new OEM Mopar coil for a truck this age is difficult. Luckily, the aftermarket offers a wide range of options. They generally fall into three categories:
Brand Quality Tiers
1. Economy Brands (DriveWire, Global Parts)
These are the most affordable options and will get your truck running again. They are a good choice for a budget-conscious repair. However, their long-term durability may not match that of higher-priced brands.
2. OEM-Quality Brands (Standard Ignition, Delphi, Bosch, Crown, NGK, Spectra)
These brands are known for producing parts that meet or exceed original factory specifications. They are the go-to choice for a reliable, stock replacement without paying a premium for a performance name. Many professional mechanics trust these brands for daily-driver repairs.
3. Performance Brands (MSD, Accel)
Brands like MSD and Accel offer high-output coils designed to produce a stronger, more consistent spark. This can lead to benefits like a smoother idle and better throttle response. However, some owners have reported reliability issues with these performance coils, with some failing prematurely. For a mostly stock engine, a quality OEM-style replacement is often the most reliable choice.
Pro Tip: Check Your Connectors
Over decades of heat and vibration, the plastic electrical connector for the ignition coil can become brittle and break. The metal terminals inside can also corrode. Before installing a new coil, inspect the connector and its wiring. Clean the terminals with electrical contact cleaner and apply a small amount of dielectric grease to the new coil's terminals to prevent future corrosion.
Aftermarket Ignition Coil Cost for 1986-1992 Jeep Comanche
| Part Type | Price Range |
|---|---|
| Aftermarket Ignition Coil | $24.13 - $106.07 |
| Shop Labor for Installation | $50 - $100 |
Frequently Asked Questions
Is it hard to replace a Jeep Comanche ignition coil?
No, it's a very straightforward job. The coil is typically mounted to the engine block or inner fender with two bolts. The process involves disconnecting the battery, unplugging the electrical connector, removing the main spark plug wire, unbolting the old coil, and installing the new one. It usually takes less than 30 minutes with basic hand tools.
🎬 Watch a full ignition tune-up and coil replacement on a Comanche.Do I need a special coil for my Renix (1987-1990) Jeep?
The ignition coils used across the 1987 to 1990 model years are interchangeable. These are a square, E-core style coil. The key is to ensure you are getting the correct style coil, as some parts systems may incorrectly show a can-style coil.
Will a performance coil give me more horsepower?
On a stock or lightly modified 4.0L or 2.5L engine, a performance coil is unlikely to create a noticeable power increase. Its main benefit is ensuring a strong, reliable spark, which can improve idle quality and throttle response, especially if the old coil was weak. The stock ignition system is generally considered very reliable.
Were there any recalls for the Jeep Comanche ignition coil?
No specific recalls were found for the ignition coil itself on the 1986-1992 Jeep Comanche. Any related recalls for Jeeps of this era typically concerned other parts of the ignition system, like the ignition switch in different models.
Helpful Videos
Technical Specifications
OEM Part Numbers: 56041476AA 56041476AB
This vehicle uses a single, square, E-core style ignition coil that provides spark to a distributor.
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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.
- Jeep Comanche:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Signs of a Failing Ignition Coil in a Jeep Comanche
- A Note on "No-Spark" Issues
- Choosing the Right Aftermarket Ignition Coil
- Brand Quality Tiers
- Pro Tip: Check Your Connectors
- Aftermarket Ignition Coil Cost for 1986-1992 Jeep Comanche
- Frequently Asked Questions
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