Have you looked at the Vehicle Speed Sensor? Sometimes, especially if it has some mileage on it, the sensor will pick up fine metal shavings on it. This condition disrupts the signal to the PCM.
4l60e shifting problems
I just picked up a 95 formula and in order for it to shift out of first gear you have to be doing about 25-30mph and let up completely off the gas and it shifts right away. All the other gears appear to be fine. So far I replaced all 4 shift solenoids, pan gasket, filter and fresh fluid. After that it got a little better but still does it so I did more reading and people say to check the tps so I replaced that also and once again better but still not how it should be. My next step is the 1-2 shift accumulator I guess the springs can break or be wore out. Any other suggestions? I'm stumped and am trying to avoid getting a rebuild done but I will if I have too.
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No I haven't, never thought of that i'll put it out tomorrow and check it out. I shouldn't have to drop the pan for that correct? I'm learning as I go with tranny's never done more than a flush but so far everything has been pretty basic.
Very simple, the vss is on the driver side rear of the tranny. If it does have metal on it, as it is a magnetic pick up, and its original equipment, you may want to get a new one for around 40 bucks. The OE ones have a hole in them, allowing the metal to enter the sensor. Virtually impossible to clean.
Cool sounds easy enough ill have a look today, probably pick one up while I'm at work since I work at advance auto. I'll keep you updated, thanks for the help.
What's been done to the car? Mods, gears, stall, or tuned?
What condition was the fluid in when you had the pan down? Discolored? Smell burnt? Was there a fine black sediment in the bottom of the pan?
Frank
Frank
The car is stock to my knowledge, bought off Craigslist about a week ago. All it has is actress flowmaster exhaust and a cold air intake. The fluid seemed fairly new and wasn't discoloured or smelled burnt.
Catless*
The first thing I would do is put a scanner on its and see when the actual comment for the shift is being given. Any real scanner or tuner should be able to see this informaton live while doing it. Shift timing issue are far more likely to be a car control issue than an actual trans issue,
Frank at PerformaBuilt
Frank at PerformaBuilt
Yeea I just dropped it off today at my buddies shop, he has a scanner and all that good stuff. I tried the speed sensor yesterday and that didn't work either. I'll keep everyone updated as info comes my way. I appreciate all the help so far!
Have you checked the tps? If the tps is showing too high a voltage the pcm wont tell the trans to shift until a higher rpm.
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Yes tps is new.
Agree,The first thing I would do is put a scanner on its and see when the actual comment for the shift is being given. Any real scanner or tuner should be able to see this informaton live while doing it. Shift timing issue are far more likely to be a car control issue than an actual trans issue,
Frank at PerformaBuilt
The major reason that the GOV shoved obd on us was supposedly so Consumers would be better informed. Most major parts stores will let you use them for the deposit and you "should" be able to retrieve codes live which will help you narrow it down considerably when it's time to seek repairs.
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Well I still have no luck in figuring out this problem so far I replaced all the solenoids, tps, speed sensor, fresh fluid, gasket, and filter, spring in accumulator is fine...the next thing I am going to do once I get it home is the manifold pressure switch and will also check the wiring from the switch to the pcm...any other thoughts? If this doesn't work I think the only thing left to do is get it rebuilt which I was hoping to avoid. Also no codes came up when it was scanned.
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