- Joined
- February 18, 2009
- Messages
- 5,331
- Reaction score
- 614
- City, State
- Winnipeg, Manitoba
- Year, Model & Trim Level
- 00 Limited V8
I've been struggling with overdrive coming and going.
In the midst of this, I've been doing all kinds of other things also.
Turbo, 347 motor etc.
Now, I 'think' I always had a lockup issue as I am totaly amazed at how low the rpm's go when locked up. I'm pretty well convinced its tuning, or something telling the computer not to lock up as there are no codes.
I did manage to re-create the issue, and now I know how to make the issue go away temporarily. I know all I need to do is re-flash the pcm and I get tc lockup for a few days.
Here's what I did:
While I had no TC lockup, I picked all the pids that I could see having anything to do with torque converter, including rpm and speed of course. Knowing that some pids just won't work at all, I felt I'd be able to determine the non working ones.
I went for a short drive, logging the pids.
Then, I re-flashed my pcm and went for another drive. I logged this drive also.
I now have a comparison.
Check out the speed/rpm difference:
At 57mph with lockup I'm at 1700rpm versus 2425rpm with no lockup
Crazy difference. If anyone would like to see the supporting logs, feel free to pm me your email address.
Here is what stood out immediately.
The pid 'UNLOCKED DUE TO SHIFTING|2|224|2|0' is always on ( 1 ) looking at the datalog of no converter lockup. This pid is always zero on the datalog that has lockup. What is this? Why is it stuck on? Is it labeled completely incorrectly on the sct device? What do I look for next?
In the midst of this, I've been doing all kinds of other things also.
Turbo, 347 motor etc.
Now, I 'think' I always had a lockup issue as I am totaly amazed at how low the rpm's go when locked up. I'm pretty well convinced its tuning, or something telling the computer not to lock up as there are no codes.
I did manage to re-create the issue, and now I know how to make the issue go away temporarily. I know all I need to do is re-flash the pcm and I get tc lockup for a few days.
Here's what I did:
While I had no TC lockup, I picked all the pids that I could see having anything to do with torque converter, including rpm and speed of course. Knowing that some pids just won't work at all, I felt I'd be able to determine the non working ones.
I went for a short drive, logging the pids.
Then, I re-flashed my pcm and went for another drive. I logged this drive also.
I now have a comparison.
Check out the speed/rpm difference:
At 57mph with lockup I'm at 1700rpm versus 2425rpm with no lockup
Crazy difference. If anyone would like to see the supporting logs, feel free to pm me your email address.
Here is what stood out immediately.
The pid 'UNLOCKED DUE TO SHIFTING|2|224|2|0' is always on ( 1 ) looking at the datalog of no converter lockup. This pid is always zero on the datalog that has lockup. What is this? Why is it stuck on? Is it labeled completely incorrectly on the sct device? What do I look for next?