I finished my swap up a little over a month ago and have been driving the truck daily since then without any issues. I was doing some testing on Friday without any issues, did a 2wd boost launch to check spool up time, did a little bit more driving and then parked it. Drove it again on Saturday, still no issues. Go for on drive Sunday evening and have an immediate 3-4 upshift after second gear. OD and TC lock up are still working, just coming in way too early.
So I do a little testing. My OD switch is no longer controlling anything. It doesn't matter if it's locked out of OD, it still goes into OD. I don't actually feel the converter locking like I usually do, but I'm pretty sure it is still locking based on the load it puts on the motor. My manual lockup switch still works though, and when using it, I can physically feel it locking, which leads me to believe my problem is electrical.
I plug the computer in and get a shift solenoid A code. I've had issues with solenoids in the past and at this point I was pretty confident it was the TC lockup and OD solenoid. So I got a new one and went ahead and replaced the governor pressure solenoid while I was in there. Button everything up, fire it up, go for a drive, and still have the same issue.
So I dig a little deeper. I pull the APPS sensor apart and test the voltage off of it. The voltage tag was gone, but while moving the throttle there was a smooth voltage increase. Nothing erratic like a bad APPS sensor would indicate. Buttoned it back up, did a APPS reset and went for another drive. Still has the same issues.
At this point, the only other thing I can think of being the culprit is the PCM, but I'm not entirely sure how to test that theory. Does anyone have any advice on what could be causing my problems? I plan to call Lavon on Tuesday, but in the meantime I've got some time to do some troubleshooting.
So I do a little testing. My OD switch is no longer controlling anything. It doesn't matter if it's locked out of OD, it still goes into OD. I don't actually feel the converter locking like I usually do, but I'm pretty sure it is still locking based on the load it puts on the motor. My manual lockup switch still works though, and when using it, I can physically feel it locking, which leads me to believe my problem is electrical.
I plug the computer in and get a shift solenoid A code. I've had issues with solenoids in the past and at this point I was pretty confident it was the TC lockup and OD solenoid. So I got a new one and went ahead and replaced the governor pressure solenoid while I was in there. Button everything up, fire it up, go for a drive, and still have the same issue.
So I dig a little deeper. I pull the APPS sensor apart and test the voltage off of it. The voltage tag was gone, but while moving the throttle there was a smooth voltage increase. Nothing erratic like a bad APPS sensor would indicate. Buttoned it back up, did a APPS reset and went for another drive. Still has the same issues.
At this point, the only other thing I can think of being the culprit is the PCM, but I'm not entirely sure how to test that theory. Does anyone have any advice on what could be causing my problems? I plan to call Lavon on Tuesday, but in the meantime I've got some time to do some troubleshooting.