Bow? lol...not to me. Looks like the resident caddy guy isn't showing on this one. Codes can make this easier, but not on this one I guess. Should go after the current code regardless.
I can email it if you can't read it.
On the symptom, it can be a bunch of things.
IF the torque convert or tcc were a problem I would have expected a code to show there. But the tcc can be checked for operation.
Things I would be looking at are a vacuum leak, a carbon build up, an out of date software issue-verify that you have the latest and greatest. Bad plug or restricted fuel filter. (IF the plugs and fuel filter have not been changed it would be a good idea) May want to try to mist some water on the wires to see if it acts up-check for an arcing-try to do this in a darker area. Again if the filter and fluid in the tranny have not been changed, this still should get done. Lack of maintenance can bring about problems like this.
Verify the actual temperature of the coolant, the PCM may be being told the temp is too high and it can be turning some cylinders off.
Since there are communication codes in the history, may be a good idea to check and clean the connectors at the BCM and the PCM.
May be fuel injectors clogging.
The list goes on much further.
IF you can get access to a scan tool that is capable of taking a snap shot of the data stream when the problem is happening , you may be able to narrow this down quicker by seeing what conditions are present when the problem occurs.
Sunday, June 8th, 2008 AT 11:19 AM