Surges/Chuggles

DESCRIPTION
Engine power variation under steady throttle or cruise. Feels like the car speeds up and slows down with no change in the accelerator pedal. Be sure driver understands [1][2]torque converter clutch and A/C compressor operation in Owner's Manual. Perform careful visual inspection as described in When To Use This Section.

INSPECTION
To help determine if the condition is caused by a rich or lean system, the car should be driven at the speed of the complaint. Monitoring block learn at the complaint speed will help identify the cause of the problem. If the system is running lean (block learn greater than 150), refer to "Diagnostic Aids" for Diagnostic Trouble Code 44. If the system is running rich (block learn less than 110), refer to "Diagnostic Aids" for Diagnostic Trouble Code 45.

Check
^ Generator output voltage. Repair if less than 9 or more than 16 volts.

^ Exhaust Gas Recirculation (EGR) - There should be no EGR at idle. See Chart C-7A.

^ EGR filter for being plugged, see Chart C-7A.

^ Vacuum lines for kinks or leaks.

^ In-line fuel filter. Replace if dirty or plugged.

^ Fuel pressure while condition exists. See Chart A-7.

^ Remove spark plugs. Check for cracks, wear, improper gap, burned electrodes, or heavy deposits. Also check condition of spark plug wires and check for proper output voltage using spark tester J 26792 (ST-125) or equivalent.