what is CASE learn?

Posted: Tue Jan 15, 2008 1:12 am Post subject: what is CASE learn?

Ive been reading about people needing to get CASE learn done to their PCM's after they get them tuned. I recently put a DHP 1.0 in my GTP....I got a chance to drive the car a few days ago when it was very nice out and no salt on the roads and no check engine light came on. What is CASE learn? and do I still need it if my car didnt trip and light?
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-2000 Grand Prix GTP silvermist
-2003 Grand Prix GT redfire metallic
-1991 Grand Prix GTP LQ1/Getrag284 5 speed. Neon blue metallic.
-1999 Regal GSE....SOLD.

Posted: Tue Jan 15, 2008 7:31 am Post subject:

If your car started, you don't need a case learn.
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2004 GT1
*COMPLETE MODS*
17" GM Accessory Rims
Pacesetters
Wizaired CAI
TOP SWAP
Powrtuner
XP Cam, 105# Springs
ZZP S2 I/C
Autolite 103s

Posted: Tue Jan 15, 2008 8:34 am Post subject:

If you replace your PCM or crank pulley, you should technically get a CASE learn for the best performance. But if you don't throw a DTC, then you can get away without one and the car will drive fine. There's no rush, but maybe at a club meet, someone with a tuner can try a CASE learn on your car. Maybe we can meet in Webster sometime and try it. It won't hurt.

Posted: Tue Jan 15, 2008 8:52 am Post subject:

You can't do a case learn without the car running Idea

_________________
Hi, I'm Matt.

I'm the resident smartass and I have fourblack children: (ok, one's only half black..)
07.5 2500HD, Duramax, Edge Race Evo CTS, MBRP 5" Stainless, TransGo, Sleeves, EGR!, PCV
09 VRSCDX - Night Rod. Flat black, gloss black
02 Black Z06. All work done by New Era Perforamnce. 519/497 at the rear, 3100 lbs.
05 Arctic Cat Firecat F7 - Sold
07 Arctic Cat F8 Sno Pro - Smashed into 1000 orange pieces.

Posted: Tue Jan 15, 2008 10:35 am Post subject:

when i had a bad crank sensor i got no codes whatsoever, when i replaced it the car ran ok and stopped randomly dying on me. after doing the case learn it really woke up. but all cars are different, if u think ur car is running good then leave it, but it should be done if u replaced the pcm
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2004 Yukon XL Trying to keep stock
2000 gtp Custom I/C, TOGs, Custom PCM, 3.25'', HAI, VS cam Retired

Posted: Tue Jan 15, 2008 11:04 am Post subject:

CASE learn is properly called "crankshaft position sensor variation learn procedure". It measures the variations of the reluctor and sensor to detect the crank position, then stores the information in the PCM. It's used to detect changes in crank speed for misfire detection and to tell the difference between misfires and running on rough roads. It also optimizes timing which is based on crank position. If you don't get a code it means that it was good enough to keep the engine running. You should get it done.
_________________
1998 Silvermist GTP Coupe
Bone stock unicorn
1998 True Green Metallic GTP Coupe
Pullied, cammed, intercooled. With a kiddie seat. It once ran a 13 flat.
1998 True Green Metallic GTP Sedan (retired)
Stock: 14.33 @ 96.5
PB: 13.89 @ 101 mph

Posted: Tue Jan 15, 2008 12:18 pm Post subject:

Posted: Tue Jan 15, 2008 3:16 pm Post subject:

Yeah....if most of you guys recomend it getting done...I will eventually have it done just to be safe. Can it be done w/ the car sitting still running? My car is sitting out in my barn....and im not driving it any time soon cause its been snowing and im sure they've put some salt down by now.

Posted: Tue Jan 15, 2008 4:04 pm Post subject:

The procedure goes like this:
1. Start CASE Learn program
2. Start the car
3. Apply Parking Brake
4. Depress main Brake
5. Click 'Go' in the program
6. Stomp on the gas (while both brakes applied) so it hits the rev limiter
7. When program says complete (~2 sec later), remove foot from gas
8. Grab a beer

Posted: Tue Jan 15, 2008 4:38 pm Post subject:

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