Engine Lugging in 4th Gear at Low RPM
06-03-2009, 12:15 AM
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Engine Lugging in 4th Gear at Low RPM Situation: 98 Auto Trans Am. As soon as car transitions into 4L I get engine lugging. Lugging only occurs at low RPM (about 1500), thus around 41-48 MPH. What makes this odd is that it seems to only occur during or within a day of extremely wet conditions (i.e. heavy rain).
For those knowledgeable, let me know if any of the following are probable causes: bad transmission (chose your words carefully), faulty app sensor, or bad torque convertor. I'm leaning towards app sensor but after careful inspection I don't see anyway that heavy moisture would cause the fault. Torque Converter is a close second but I'd rather not shell out dough just yet for a new one so any thoughts are very much appreciated.
For those knowledgeable, let me know if any of the following are probable causes: bad transmission (chose your words carefully), faulty app sensor, or bad torque convertor. I'm leaning towards app sensor but after careful inspection I don't see anyway that heavy moisture would cause the fault. Torque Converter is a close second but I'd rather not shell out dough just yet for a new one so any thoughts are very much appreciated.
06-03-2009, 12:58 AM
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If it doesn't do it AT ALL when its dry out....it could be the wires for the 02 sensors. They're usually the culprit for a bad/rough running engine when its wet out. Could also be a ripped spark plug wire, same thing, the wet mist can make it arc, causing a misfire.
06-10-2009, 05:48 PM
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I found a broken gasket that is causing oil to dip on to the o2 sensor wire inputs, is this enough to cause an o2 malfunction?
Last edited by Durst451; 06-12-2009 at 03:15 PM.
