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Jeep Ignition Parts and Accessories by Davis Unified Ignitions for Grand Cherokee WJ

1999-2004 Jeep Grand Cherokee WJ


Performance Distributors now offers the D.U.I. (Davis Unified Ignition) for AMC engines. The AMC D.U.I. is a one-piece ignition system with the coil in the distributor cap and the module inside the distributor. The D.U.I. Coil produces 50,000 volts and allows spark plug gaps to be opened up to .050" - .055". The Performance Distributors Dyna-Module has more electronic dwell time in it to give the coil more saturation time and produce a hotter spark. The D.U.I. distributor eliminates the ballast resistor that is used on the stock AMC ignition system. This will allow full alternator voltage through the ignition system and will provide a stronger spark and more power.

The AMC D.U.I. is a real work of craftsmanship and although it is uniquely designed, replacement parts are easy to find. High Energy Ignition (H.E.I.) replacement parts will fit right on the D.U.I. These parts can be found at any local auto parts store.

Davis Unified Ignition recommends the use of Autolite Platinum Spark Plugs found below.


Firepower Ignition Kit - 4.0L

The Firepower Ignition Kit includes several Jeep accessories and parts to enhance the performance of your ride.

The Benefits From these Upgrades:
  • Greater Throttle Response Time
  • Better Fuel Economy
  • Wider Spark Plug Gaps
  • Quicker Starting / Smoother Idle
  • More Horsepwer and Torque
The Kit Includes:
  • Screamin' Demon Coil
  • LiveWires (Red)
  • Cap and Rotar (Black)
Image Description Part # Price
D.U.I Performance Distributors Firepower Ignition Kit

D.U.I Performance Distributors Firepower Ignition Kit


1991-1999 4.0L, 242 CID, Inline 6-Cylinder


DUI-4.0KIT $174.99


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Screamin' Demon Coils

The Screamin' Demon Coils are designed to produce an exceptional spark throughout the entire RPM range with virtually no drop in power. Stock coils are notorious for falling off as RPM goes up. Our Screamin' Demon Coil has been dyno tested providing 3 more horsepower at 5000 rpm over stock coils. The Screamin' Demon has a brass terminal for which your coil wire attaches to. The brass terminal is more conductive than the stock aluminum terminal and will resist corrosion longer. Spark Plug gaps can be widened to .065" due to the energy of this coil. The wider spark plug gap will allow more spark energy into the combustion chambers providing more power and improved mileage. The Screamin' Demon is too "hot" for stock plug wires. 8 mm spiral core wires are highly recommended. The Screamin' Demon is an externally mounted coil.

*NOTE: 1991-1992 and 1998-1999 Jeeps require the Wiring Harness Adapter (which can be found here on this page) for our Screamin' Demon Coil to work with the factory plug in harness.

Autolite Platinum Spark Plugs

Image Description Part # Price
D.U.I. Screamin' Demon Ignition Coil

D.U.I. Screamin' Demon Ignition Coil


1991-1999 4.0L (6-Cyl), 2.5L (4-Cyl) and 5.2L (V8) Engines


DUI-31728 $69.99


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Cap and Rotor

The Jeep Cap and Rotor kit features brass terminals which are more conductive and resist corrosion longer than caps with aluminum terminals. This cap and rotor kit has excellent dielectric strength and resists carbon tracking.

Autolite Platinum Spark Plugs

Image Description Part # Price
Performance Cap And Rotor Kit

Performance Cap And Rotor Kit


1991-1999 4.0L (Inline 6-Cylinder) Engines


DUI-35100 $24.99


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Autolite Platinum Spark Plugs

D.U.I. recommends the use of Autolite Platinum spark plugs to be used with all their ignition systems. Choose the spark plugs for your particular Jeep application from the table below.

Image Description Part # Price
Autolite Platinum Spark Plug

Autolite Platinum Spark Plug


Fits Jeep 8 Cylinder Engines


AP65 $3.99

Autolite Platinum Spark Plug - Sold Individually


Fits Jeeps with 2.5L, 4.0L & 4.2L Engines


AP985 $3.99


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