Edmunds Answers

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  • avatar karjunkie 03/13/09 8:43 am PST

    A loud popping noise from the transfer case under load is usually a slipping clutch plates inside the transfer case. What your experiencing is the auto 4WD engaging the clutch inside the transfer case and it is pulsing off and on thus giving you a "popping" noise. Most often it is caused by the use of different tires (such as a spare) on one or more of the wheels that have a different aspect ratio. This confuses the wheel sensors and leads to a engage/disengage problem with the transfer case clutch. If it persists after you check the tires, then you need to hook up a scan tool to the transfer case front and rear speed sensors and the 4 wheel speed sensors to see if there is a concern there where the module is seeing a shaft speed or wheel speed slower than the others thus making the clutch turn on.

Answers

  • karjunkie 03/13/09 8:43 am PST

    A loud popping noise from the transfer case under load is usually a slipping clutch plates inside the transfer case. What your experiencing is the auto 4WD engaging the clutch inside the transfer case and it is pulsing off and on thus giving you a "popping" noise. Most often it is caused by the use of different tires (such as a spare) on one or more of the wheels that have a different aspect ratio. This confuses the wheel sensors and leads to a engage/disengage problem with the transfer case clutch. If it persists after you check the tires, then you need to hook up a scan tool to the transfer case front and rear speed sensors and the 4 wheel speed sensors to see if there is a concern there where the module is seeing a shaft speed or wheel speed slower than the others thus making the clutch turn on.

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