Dying 4T45E

[Nate's Alero]

alright,


here is the story,

the car has been fine for the 6 days it has been running, now today,

whatever gear is the first gear

natey1112 (9:03:56 PM): from a standstilll
natey1112 (9:04:17 PM): its
natey1112 (9:04:18 PM): so
natey1112 (9:04:20 PM): say
natey1112 (9:04:24 PM): the stock shift point
natey1112 (9:04:28 PM): gently accelerating
natey1112 (9:04:32 PM): is 2500 RPM
natey1112 (9:04:38 PM): to the second gear
natey1112 (9:04:42 PM): no
natey1112 (9:04:44 PM): now
natey1112 (9:04:48 PM): if i push it a bit harder
natey1112 (9:05:01 PM): (remember its a good shift on the 2500 rpm)
natey1112 (9:05:09 PM): and it shifts at 3000 rpm
natey1112 (9:05:13 PM): it goes and shifts
natey1112 (9:05:15 PM): and then goes
natey1112 (9:05:17 PM): prrp
natey1112 (9:05:18 PM): like
natey1112 (9:05:20 PM): slip
natey1112 (9:05:22 PM): and then is fine
natey1112 (9:05:24 PM): and then
natey1112 (9:05:28 PM): anything over it
natey1112 (9:05:29 PM): is fine
natey1112 (9:05:34 PM): its at 3K rpm
natey1112 (9:05:42 PM): the "slip" occurs

i copied the IM becuase it as best explained there

[WhiteV6]

maybe its stupid like my cutlass. Right before it goes into OD, it revs a little. Rebuilt and whatever but thats how it is for my car.

[Nate's Alero]

maybe its stupid like my cutlass. Right before it goes into OD, it revs a little. Rebuilt and whatever but thats how it is for my car.

meh, idk, maybe never noticed it before....

[[ion] C2]

mine does too (@WhiteV6)

[Nate's Alero]

C2;453118']mine does too (@WhiteV6)

wierd... maybe mine is stupid and cant shift straight (no offense to anyone)

[cherrington17]

so.... wouldn't typing it out be easier then cut and pasting then deleting....???


and i can't say my tranny does any of that....

[TheEdgeofSanity]

i still say that its in safe mode since you just fixed the car and reset the PCM...

[[ion] C2]

there is no "learning shift points" safe mode, the tune is the tune.

[TheEdgeofSanity]

C2;453154']there is no "learning shift points" safe mode, the tune is the tune.

you'd be surprised. when i disconnect my battery for an hour, my tranny shifts like its on crack for a few days then goes back to its old self. it does exactly as he describes...

[[ion] C2]

i would be surprised. when i disconnect my battery for a week, my transmission shifts just like it did before.

[TheEdgeofSanity]

well, i dunno what to say. must be one of the 3400 4t45e combo's stupid quirks. it happens. i promise.

[[ion] C2]

i'm sure it does but not because it's learning shift points, it's something else that's causing it to be in limp mode

[TheEdgeofSanity]

it goes into limp mode after the PCM is reset... it does that for a certain amount of miles that i don't know offahnd then (from what i'm told and have personally observed) goes into a certain tune based on your driving habits.

[xXManwhoreXx]

its like 50 or so miles

[Caboose73]

i dont know if the 3400 has an IAT sensor but if it does check that cause mine was unpluged one time and the tranny was all screwed up on shifts

[Gr1m]

^ yep but if it was the IAT it would be shifting VERY aggressive, even from N to D

[Beholder88]

Mine was shifting really hard and missing/slipping. Turned out one of the wires from my MAF sensor was corroded. I cut out the bad part of the wire and soldered it back together - all is good now.

[Nate's Alero]

Mine was shifting really hard and missing/slipping. Turned out one of the wires from my MAF sensor was corroded. I cut out the bad part of the wire and soldered it back together - all is good now.

it shifts great, just that little blip, it does it after 20 or so miles of driving, and if i pull over, shut the car off and then restart, it wont do it again for a while

[Beholder88]

Could be a sensor that goes bad when it's hot? I would just double check all of your wiring first just to be safe, other than that, wait for an engine code.

[Nate's Alero]

well, i found out my tranny cooler lines in my rad were blocked by dust, overheating tranny..... drained and refilled rad... car is fine now