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David sent me another data log file this morning. I have charted the data log and included it below. I have also attached the data log from David and the Chart from the PID Charting Tool.
@BWST might be able to manipulate the TCC% and GEAR PID's a bit better. I ended up changing the FUEL PW trace to GEAR and APP% to TCC% in order to reflect the data points requested.
Hmm, can't really pick it up from the graph but scrolling through the data I noticed your 2-3 shift takes over twice as long from the time pcm commands it to shift and the shift actually happening. Roughly half a second vs about 1.2 seconds. I don't speak "automatic transmission", still waiting on that particular Rosetta Stone to come out, but I'd guess that is a clue. Not sure if it could be a solenoid thing or a something in that "worlds most insane game of snake" otherwise known as the valve body, but at least there's data here documenting that you're not crazy. Something is actually going on.
Good bird's eye view of the data there, Sous, and we can see the TC lock working as it's intended, but not much info on the hard 2-3 shift.
Here's a zoomed in view of one of the runs through the gears. At first glance, it looks normal, with each shift taking about 0.6 seconds once RPM started to drop, which would typically feel smooth, or even firm.
I increased the resolution on the charting tool to see more data points, and noted one of the 2-3 shifts showed erratic RPM. There was also a delay from commanded 2-3 shift to the start of the RPM drop: about 1.3 seconds, compared to 0.4 seconds for 1-2 and 3-OD shifts. EDIT: udsuth78 saw this first!
I noted the other 2-3 shifts in the chart also showed this delay, but most had normal RPM drop. Could this 2-3 shift delay indicate a problem with the solenoid or valve body?
So with one of the 2-3 shifts on this test drive I noticed what I will term as a "hesitation" then the hard shift. This is the first and only time I have experienced this.
David
It looks like it could be a sticky 2-3 accumulator valve. That could do all of the symptoms that have been shown here. The solenoid does control when the shift starts, but has nothing to do with how hard or soft the shift is.
It looks like it could be a sticky 2-3 accumulator valve. That could do all of the symptoms that have been shown here. The solenoid does control when the shift starts, but has nothing to do with how hard or soft the shift is.
Thanks Mark, So I assume from that my best bet is to take it into a transmission shop?
David
That depends on how adventitious you are. It's not to difficult to tackle yourself just meticulous. Clean is the name of the game in an automatic transmission, that and pay attention how it comes apart(pictures, pictures, pictures). Still beats the shop tanking you to the barrel, and still not knowing if they fixed it or just cashed your check and dumped a bottle of shutter stop in it.
That depends on how adventitious you are. It's not to difficult to tackle yourself just meticulous. Clean is the name of the game in an automatic transmission, that and pay attention how it comes apart(pictures, pictures, pictures). Still beats the shop tanking you to the barrel, and still not knowing if they fixed it or just cashed your check and dumped a bottle of shutter stop in it.
Absolutely true. It’s not going to be possible for me to tackle it. I’m three months out from knee replacement surgery and while I’m doing great getting up and down is not so good. Not sure what avenue I’ll take just yet.
We wish you the best of luck. Come back and let us know what the shop says and the final fix. Sorry we couldn’t help you fix it at home.
Will do. I appreciate the help. Turns out my close friend has a long time friend that has an independent transmission shop so I'm going to take it there. I'll report back.
David
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