Originally Posted by Danthurs
Even after all the work I did on my car, I rebuilt my own transmission, new torque converter, testing my TCC switch, etc. I still get surging. All though not nearly as often as before I adjusted my TCC switch. I suggest turn the switch in 1 tooth and try that, then adjust again if needed. I find mine surges mainly around 45mph, in 4th gear with TC locked. Start going up a small hill and the engine load goes up, but still stays locked up and will surge. I now simply reach down and shift in the 3rd gear and all is well. Then at the top of the hill shift back to 4th. Over the years I have heard many people complain of the same problem. It can be minimized with adjusting the TCC switch, but rarely seems to go away all together. Seems to be a inherent problem with our cars. I even went in and played with the tune in the PCM a bit. My belief on this is a small tuning error where things like throttle position, load, speed, and gear all over lap and cause a conflict. The torque converter then goes in and out of lockup.
I think there'* some kind of electrical problem somewhere. The surging had occured whenever I drove the car after tranny overhaul up until the day before yesterday. Saturday we went for a drive and I didn't experience the surging problem. Maybe I just wasn't duplicating the conditions quite right, I don't know. Once we got back home I disconnected the battery to check out some of the electrical, checked some fuses then hooked everything back up and so far no more surging.
But now my oil pressure guage is really jumping around. Enough to trigger a DIC message to check the guage. I haven't touched the op sender since replacing it 8 days ago. I suppose I just need to dig into the wiring diagrams.