A faulty MAP sensor will usually trigger a “check engine” warning light. Other signs of a bad MAP sensor include rough idling, sluggish acceleration or hesitation, poor fuel economy or black ...

• Multi-meter with DC scale • Hand-operated vacuum pump • Quadratec PN 55122.2001 MAP sensor for '87-‘95 Jeep Wrangler and Cherokee with 4.0L or 2.5L engine ...