Are these related? @gsxr's post Transmission overload protection switch ? | Transmission and Driveline seems to indicate they are, along with @gerryvz's great transmission troubleshooting doc. How am I supposed to translate "Check control valve B-1 for ease of operation." Does that mean pull the BI piston cover and see if the piston moves freely?
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Pin 17 code 8, no second gear, "Check control valve B-1 for ease of operation."?
- Thread starter winmutt
- Start date
Help me understand the modulator here. Mine is leaking so its unhooked currently and FCP just delivered a replacement. I also have a replacement OL switch as well. If I can get away with just replacing the modulator that would be great. If I have to replace both and redo a B1 or valve body, I might as well pull the trans.
@luckymike, I can't recall if you posted about this before. Do you mean the trans skips 2nd gear at light throttle, but you get 2nd gear at full throttle (1-2 upshift)?
The modulator controls shift firmness only.
The O/L switch has nothing to do with controlling when a shift occurs.
Neither will fix a shift RPM issue, assuming that's what both are describing, i.e. the trans appears to skip 2nd gear and shift from 1st to 3rd.
The modulator controls shift firmness only.
The O/L switch has nothing to do with controlling when a shift occurs.
Neither will fix a shift RPM issue, assuming that's what both are describing, i.e. the trans appears to skip 2nd gear and shift from 1st to 3rd.
I can't make this up... pulling out of the car meet (Atlanta Old Benz Club) this afternoon, I lit up the rear wheels and layed down a surprising amount of rubber. I must have built up a enough pressure in the Trans to blow out something in the valve body. I now have 4 working gears!!! I didn't mention it here but 4th was also missing. The old Italian tune up FTW!!!!
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@gsxr yes, at light throttle the trans skips 2.
I only experience second gear under two conditions. 1. From a full, or near full throttle start from a dead stop, and 2. During normal acceleration, by quickly flicking the shifter from D to N and back to D at about 15-20mph. Otherwise, during normal, light throttle acceleration, the car will wind out in first gear until 24mph then jump straight to third.
There is a third condition that I recently discovered. If I'm coasting down a slight grade (after a full stop) which then requires acceleration between 15-20mph or so, I'll sometimes discover that the trans has shifted to second.
Now that I think about it, during a fairly low-speed kickdown, the trans is reluctant to shift from 3-2, rather jumping all the way to 1. Not great for passengers.
Weird.
