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Moses Ludel

4WD Mechanix Magazine Tests Pulstar® Spark Plugs in the Jeep 4WD XJ Cherokee 4.0L Engine

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The magazine had the opportunity to test Pulstar® spark plugs in the 1999 Jeep XJ Cherokee 4.0L. These unique spark plugs received our extensive testing in the XJ Cherokee and the two Honda dirt motorcycles. The plugs work optimally with both gasoline and natural gas engines. The magazine article is available at: http://www.4wdmechanix.com/Testing-the-Enerpulse-Pulstar-Spark-Plugs.html. We will continue testing and discussing these spark plugs at the magazine and these forums!

 

Here are our findings with the XJ Cherokee:
 

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1999 Jeep XJ Cherokee 4x4 4.0L—This inline six-cylinder engine is nearly stock. The addition of a Borla header, Random Technologies' performance catalytic converter and the Hypertech 'Max Energy' program tuning are the only modifications. The vehicle's approximate curb weight of 3,800 pounds with a Warn front winch and an aftermarket ARB front bumper and Warn rear heavy duty bumper. The axles have 4.10:1 ring and pinions to compensate for the 33" diameter tires and a 6-inch long-arm suspension lift.
 
Prior to testing with the Pulstar® spark plugs, this vehicle operated with Bosch spark plugs that burned well with a fully functional ignition and EFI/MPI system. There were no issues with ignition misfire or EFI fuel supply problems, and this engine has normal, uniform compression and cylinder seal. The change to Pulstar® plugs gapped to factory 0.035" was the only change made for this test.

We waited for the first tank of fuel to burn through before making comparisons. At that point there were several distinct improvements:

1) Better tip-in throttle response at any road speed and under heavy acceleration.

2) Less throttle needed to sustain normal "cruise" road speeds.

3) Less downshifting on grades with cruise control applied. Acceleration improved with both forced and cruise control downshifts.

4) Distinct improvement in fuel efficiency; approximately one mile per gallon improvement (5.5%) under "city" and "highway" or interstate test conditions.

5) Starts immediate; this engine has always started well.

 
Details and actual spark plug installation coverage can be seen in the HD video:
 


Moses

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