Data logged my N20 pass... Question about converter and Trans.
Im sure it was bouncing off the rev limite like crazy. She said she backed out of it and only figured out afterwards she was in 2nd and forgot to put it back into OD after her burnout. Honest mistake but I couldnt help to laugh at her.
Not sure but sounds like the info below may be helpfull to you
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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.
Of course if you haven't been tuned for the stall that could also be your issue
Hope something here helps
LS1TECH & Trucks Sponsor
Trader Rating: 20
Join Date: Aug 2006
Location: SUGAR LOAF PA
Posts: 7,244
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.
Of course if you haven't been tuned for the stall that could also be your issue
Hope something here helps
FWIW, I have only ever seen that be an issue with 98s. The 99s-up I had over 100 cars tuned before the first issues with this code showed up in a 98 with a super-rank cam. Every 98 that has had an issue with this has had a decently large cam (>23X @.050). I have seen it about 2 dozen times now.