NAVY99B4C

iTrader: (7)

I pulled my trans this winter to have it gone throught to make it stronger for this year. Long story short ive had nothing but problems.

first time around broke a pressure plate somehow. 21 miles.

second time around smoked 3-4 cluthes in les than 500 miles.

third time around popped a snap ring im guessing causeing the pressure plate to be pushed out and ripped the ridges out of my input drum. again less than 500 miles.

Since i first got it back it would stack 2-3 shift at 45mph no matter where i adjusted my tuning setting. (its set to shift at 62-63 mph not 45 in both wot and part throttle tables.)

Still doing this at the moment but i did find out someone put a transgo shift kit in it before i bought it, then the guy cranked the solenoid, added with my line pressure maxed i belive is way to much pressure causing all the prior problems.

But.. i still cant get it to stop short shifting 2-3. and thats causing me to not be able to tune downshifts,shift points, exc.

So any input on what you think is going on and how i could fix it would help me greatly.

NAVY99B4C

iTrader: (7)

anyone?

SILVER 2288 SS

iTrader: (1)

im having the same problems wih my car short shifting 12 23 abd 34 unles im at 1/2 or more throttle cant launch the car at all cause it shifts prematurely any info would be good

performabuilt

iTrader: (25)

PO121 or QUICK SHIFT 1-2-3-4 AT WOT after cam or throttle body install FIX
Found this on another forum posted as a single thread but wanted to have in this thread for easy reference also

PO121 CODE OR QUICK SHIFT 1-2-3-4 at WOT by 40 MPH FIX
Found this info on another forum and I know many people have popped up with this issue and wanted a fix. This would appear to be it. Hope it helps someone.

The curse of the P0121 Code... This code is infamous for giving people with larger cams fits...everything from traction control troubles, to shift point issues to just the good ole' P0121 code showing up for seemingly no reason making people scramble to purchase new Throttle Position sensors, adjust their set screws, etc, etc.

Before I go any further have a gander at the DTC information provided by LS2.com

http://www.ls2.com/boggs/dtcs/DTC%20P0121.htm

To outline a few key points

Quote:
The MAP is greater than 65 kPa

Quote:
The predicted throttle angle does not match the actual throttle angle

Quote:
All conditions present for 20 seconds

Now, that 65kpa map figure comes into play in nearly every LS1 Car/Truck because its the max map setting in most of the calibrations for the sanity test as shown here


Under normal circumbstances a stock cammed A4 will probably idle at around 35-40 map. When switching to a larger cam with more overlap your map readings could go up to as high as 70 or more kpa map which is way outside of the normal boundries. On a stock cammed car you'd probably need to be at around 30% tps to hit that same map number which is where that predicted throttle angle quote comes into play.

Now onto the last quote the 20 second timeframe. This will Usually come into play more often than not at idle with large cammed vehicles because many times your steady state map will be within the map sanity guidelines so there is a good possibity you might not see this code pop up immediatly.

There are a few ways you can cure this issue
a. Do as suggested in the help file which is to just set the min to 0 & max to 100
b. Adjust them to YOUR liking so you'll be within a reasonable limit. This will help determine if there IS a real issue with your TPS sensor later down the line.

So there you have it, as good an explanation I can come up with for that bastard code. So the next time you go WOT in your auto LS1 with a large cam & you go from 1st to 4th by 40mph or just a nagging p0121 code for no obvious reason you now have the info needed to fend it off.

NAVY99B4C

iTrader: (7)

ill check into that! ive never had that issue yet tho. but mine finally threw a code last night. p0785 shift solenoid circuit electrical. controls 3-2 downshift which i belive will affect 2-3 shifts also. Im gonna change that solenoid and ill be reporting back to see if that fixes it.

Ive adjusted all i can adjust and it never changed so that makes me belive that its a mechanical issue with that solenoid.

SILVER 2288 SS

iTrader: (1)

im wondering if a larger maf would help this situation

SILVER 2288 SS

iTrader: (1)

if not what program can i use to edit those peramiters

performabuilt

iTrader: (25)

HP TUNERS can alter the parameters