2001 Automatic Transmission issue
Thread Starter
7th Gear
Joined: Apr 2016
Posts: 7
Likes: 0
2001 Automatic Transmission issue
Hello guys,
I just picked up a project car with known issues, before I take it to the garage I was wondering if I could get some opinions on what the issue might exactly be.
History of the car:
The engine has been replaced , engine is around 156k mark
Transmission has been rebuilt
Rear end was rebuilt
New transmission cable
There are receipts to validate the claims but I have no idea what the actual work completed was as I have no itemized bill but the car still has issues.
When driving normal the car drives and shifts fine. You can gradually
press the accelerator and it will shift through all 4 gears. However if you are going around 45 mph and just punch the accelerator it will bang off the rev limiter and will not shift unless you back off the pedal and gradually push it down. It does the same thing with traction control on and off.
There is also a clicking noise coming from the right rear wheel, you can hear it click when backing up and moving forward. The clicking sound gets faster (not louder ) as you accelerate.
Do you guys have any ideas? I'm mechanically inclined but this is my first corvette.
Thanks for your time,
Full Spool
I just picked up a project car with known issues, before I take it to the garage I was wondering if I could get some opinions on what the issue might exactly be.
History of the car:
The engine has been replaced , engine is around 156k mark
Transmission has been rebuilt
Rear end was rebuilt
New transmission cable
There are receipts to validate the claims but I have no idea what the actual work completed was as I have no itemized bill but the car still has issues.
When driving normal the car drives and shifts fine. You can gradually
press the accelerator and it will shift through all 4 gears. However if you are going around 45 mph and just punch the accelerator it will bang off the rev limiter and will not shift unless you back off the pedal and gradually push it down. It does the same thing with traction control on and off.
There is also a clicking noise coming from the right rear wheel, you can hear it click when backing up and moving forward. The clicking sound gets faster (not louder ) as you accelerate.
Do you guys have any ideas? I'm mechanically inclined but this is my first corvette.
Thanks for your time,
Full Spool
Pro
Joined: May 2014
Posts: 670
Likes: 46
From: Indiana
When driving normal the car drives and shifts fine. You can gradually
press the accelerator and it will shift through all 4 gears. However if you are going around 45 mph and just punch the accelerator it will bang off the rev limiter and will not shift unless you back off the pedal and gradually push it down. It does the same thing with traction control on and off.
press the accelerator and it will shift through all 4 gears. However if you are going around 45 mph and just punch the accelerator it will bang off the rev limiter and will not shift unless you back off the pedal and gradually push it down. It does the same thing with traction control on and off.
Thread Starter
7th Gear
Joined: Apr 2016
Posts: 7
Likes: 0
I can't feel it downshifting , of course there's alot going on in those few seconds . It seems like it goes into neutral, bangs the Rev limiter. I let out and drive it normal. I still need to test it more but that's the best I can describe it until I get the power steering line fix so I can post a video.
Pro
Joined: May 2014
Posts: 670
Likes: 46
From: Indiana
If it isn't downshifting then it's probably slipping 3-4 clutches or the band.
If it is downshifting I would suspect that when the rear end was rebuilt the ratio was changed and the computer tune wasn't properly updated for when to shift (rpm and vehicle speed) at WOT.
Where are you located?
If it is downshifting I would suspect that when the rear end was rebuilt the ratio was changed and the computer tune wasn't properly updated for when to shift (rpm and vehicle speed) at WOT.
Where are you located?
Thread Starter
7th Gear
Joined: Apr 2016
Posts: 7
Likes: 0
I am close to bowling Green , actually glasgow. So that's probably a 4 trip I would guess .
Pro
Joined: May 2014
Posts: 670
Likes: 46
From: Indiana
Well, the way I drive, I'm a bit under 3 hours to Bowling Green, so probably about 3.5 to Glasgow. 
I haven't been to the museum since the hole was fixed....
I'd like to put my HPTuners scanner on your car and see what the computer is doing and sees.
We were probably going to put the top down on the vette and go cruising Sunday or Saturday anyway...
If you'd like to have me take a look I can see what the wife thinks about a 6 hour cruise...
Why am I suddenly thinking about Gilligan's Island???
It's not like we haven't driven down there just for the heck of it before!
I haven't been to the museum since the hole was fixed....
I'd like to put my HPTuners scanner on your car and see what the computer is doing and sees.
We were probably going to put the top down on the vette and go cruising Sunday or Saturday anyway...
If you'd like to have me take a look I can see what the wife thinks about a 6 hour cruise...
Why am I suddenly thinking about Gilligan's Island???
It's not like we haven't driven down there just for the heck of it before!
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Thread Starter
7th Gear
Joined: Apr 2016
Posts: 7
Likes: 0
Haha if your wife's name is Mary Ann then that would be even funnier . If you wanna come down I would be honored by your generosity The car will be on the lift tonight as I'm gonna start going through it and get the high pressure power steering line fixed tonight.
Last edited by FullSpool; Apr 15, 2016 at 04:37 PM.
Racer
Joined: Apr 2013
Posts: 253
Likes: 3
Check it for codes. See if one is present for the 3-2 downshift solenoid. We see this complain quite often when the wrong year transmission is installed, but that's not very likely in your C5, unless someone has swapped the valve body. If it's cutting loose on the 2-3 shift at heavier throttle, it could very well be the 3-4 clutches. They were a fragile area in the stock 4L60Es. We have to correct no less than 6 different "design flaws" in them just dedicated to the 3-4 clutches.
Frank
Frank
Thread Starter
7th Gear
Joined: Apr 2016
Posts: 7
Likes: 0
Worked on it some more today, first 2 pulls I did today it didn't hardly missed a beat. Slight slip between 3 to 4 .
As I continued testing 3 and 4 pull banged off the rev limiter again , all these pulls were from 40 to 75 mph.
The noise I heard from the right rear wheel is actually a clicking noise in the transmission. It doesn't get any louder only gets faster as Rpms increase .
I have an O2 code and some abs errors. Also the dash light shows the traction control light (amber color ) on . It doesn't matter if you turn the button on or off it stays illumated.
As I continued testing 3 and 4 pull banged off the rev limiter again , all these pulls were from 40 to 75 mph.
The noise I heard from the right rear wheel is actually a clicking noise in the transmission. It doesn't get any louder only gets faster as Rpms increase .
I have an O2 code and some abs errors. Also the dash light shows the traction control light (amber color ) on . It doesn't matter if you turn the button on or off it stays illumated.
Last edited by FullSpool; Apr 16, 2016 at 10:31 PM.
Drifting
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
At what rpm do you hit the rev limiter? Here's is a link that describes how to pull the codes. Need to know the codes to help you out.
http://www.stengel.net/diccodes.htm
http://www.stengel.net/diccodes.htm
Pro
Joined: May 2014
Posts: 670
Likes: 46
From: Indiana
HPTuners confirmed the PCM was commanding a downshift into 2nd and after some banging off of the rev limiter the tranny settled down and started pulling through the 2nd gear WOT rev range. Line pressure solenoid current was reduced during this period as expected. We noted that a 3rd-1st downshift operated as expected.
I agree thumpinc5 that there may be an issue with the 3-2 solenoid. To me it seems as if the band is taking a while to firmly engage but when it does all seems well.
I agree thumpinc5 that there may be an issue with the 3-2 solenoid. To me it seems as if the band is taking a while to firmly engage but when it does all seems well.
Thread Starter
7th Gear
Joined: Apr 2016
Posts: 7
Likes: 0
HPTuners confirmed the PCM was commanding a downshift into 2nd and after some banging off of the rev limiter the tranny settled down and started pulling through the 2nd gear WOT rev range. Line pressure solenoid current was reduced during this period as expected. We noted that a 3rd-1st downshift operated as expected.
I agree thumpinc5 that there may be an issue with the 3-2 solenoid. To me it seems as if the band is taking a while to firmly engage but when it does all seems well.
I agree thumpinc5 that there may be an issue with the 3-2 solenoid. To me it seems as if the band is taking a while to firmly engage but when it does all seems well.
Here are the list of codes so far :
C1225 front wheel excessive wheel speed variation history
C1287 steering sensor rate history
C1288 steering sensor circuit
P1133 heated oxygen sensor
I also have the service traction control warning message across the dash.
Advanced
Joined: Apr 2016
Posts: 51
Likes: 3
Thanks for all the help Greg , I appreciate you taking time to help me out . Hope you and your wife enjoyed the drive . I still havent made it to the transmission shop , once work allows me to leave at a reasonable time during the week it's my first stop ! I've been looking at the diagrams and I don't know if I'm confident enough to tear it apart just yet, hopefully after the shop visit I will feel a little better about it. I've been driving it daily so it hasn't got any worse.
Here are the list of codes so far :
C1225 front wheel excessive wheel speed variation history
C1287 steering sensor rate history
C1288 steering sensor circuit
P1133 heated oxygen sensor
I also have the service traction control warning message across the dash.
Here are the list of codes so far :
C1225 front wheel excessive wheel speed variation history
C1287 steering sensor rate history
C1288 steering sensor circuit
P1133 heated oxygen sensor
I also have the service traction control warning message across the dash.