Hi vern8650,
Thank you for the donation.
Hope the following helps.
BACKFIRING Ã Â Â
Check for vacuum leaks. Ã Â Â
Ensure ignition timing is correct. Ã Â Â
Ensure timing belt or chain has not jumped. Ã Â Â
Check distributor. Ã Â Â
Ensure fuel injectors are not leaking. Ã Â Â
Check spark plugs and plug wires. Ã Â Â
Check ignition and coil circuit. Ã Â Â
Check crank and cam sensors. Ã Â Â
Check TP sensor and connector. Ã Â Â
Check exhaust system.
HESITATION - ACCELERATION Ã Â Â
Check for vacuum leaks. Ã Â Â
Check ignition and sensor wires for proper connection. Ã Â Â
Check distributor cap for moisture. Ã Â Â
Check idle air control motor. Ã Â Â
Check minimum idle airflow. Ã Â Â
Ensure spark plug wires are okay. Ã Â Â
Ensure spark plugs are not fouled. Ã Â Â
Check MAP sensor. Ã Â Â
Check TP sensor and connector. Ã Â Â
Check ignition and coil circuit. Ã Â Â
Check crank and cam sensors.
TESTS W/O CODES - 4.0L -1998 Jeep Grand Cherokee Laredo 9/7/2008
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Sunday, September 7th, 2008 AT 6:24 AM