1991 Ford Explorer 2D Utility, 4WD, AutomaticFACTORY OEM SERVICE PROCEDURE

Test 2, Check For Spark During Crank

Using Neon Bulb Spark Tester (D89P-6666-A), check for spark at each right side spark plug wire while cranking. If spark is present and consistent (one spark per crank revolution) on all right side spark plug wires, go to next test. If spark is not present or is inconsistent, go to TEST 5.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.