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Backfire through intake with no start
Posted to Technical Tips Forum on 3/4/2014 24 Replies

I recently got in a this vehicle from another shop actually a jeep dealer here on long island. Well I wanted to throw this tip out there so no one else gets burned like how ever many shops got this before me. Apparently the ignition coil for a 99 is a 1 year coil and the pins are reversed in the connector on a 99 pin 1 is ignition driver #1 pin 2 is ign drive #2 pin 3 is the asd power and pin 4 is the #1 ignition driver. well in the 2000-2004 coil which is the only available coil now the wires are reversed. pin 1 is ign drive 1 pin2 is asd power pin 3 is ign drive 2 and pin 4 is ignition drive 3. well long story short you must de pin the connector or buy a jumper harness for 80 dollars hope this save you some time fellas

Anthony from New York

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car Vehicle Data

1999 Jeep Grand Cherokee Laredo 4.0L

Engine4.0 L
Trans4-speed Automatic (Electronic)