I just got my motor back and im getting ready to install it.. I had a post in 06 about this same subject when i did the 2.2<2.4 engine swap and I can NOT remember if this crank re-learn was needed or not.. Now I did get the re-learn done at a local shop with a Tech 2 back in 06.. But its almost bash time and im not sure if Ill have time to do this again.

Is it a must to have it done? if its not done, will the car still run correctly?











~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ

depends, it is not necessary all the time, but COULD be necessary when changing cams, cam sensor, crank, crank sensor, engine, etc......it should run, but will throw the relearn code. You can do the relearn with HPT also, I dont know what you are tuning with.

relearn? wtf?

crank relearn, to relearn the synch between crank and cams basically.

I have never had to do this on a 2.4. We have swapped motors out, rebuilt motors, and never had this issue. I sometimes wonder if it even exist's on a J.



FU Tuning

^^ same here john, ive NEVER even heard of such a thing before now. never had an issue with any of the ld9's my dad n i have worked on. i dont think it even mentions anything of the sort in the haynes manual...

Thanks guys..

John B. Im tuning with HPT.. I didnt know we could relearn crank with HPT.. Ill definately keep that it in mind if a code just so happens to pop up.

Brad yea when i did the swap 2 years ago I had it done just to be sure.. Hooked the Tech 2 up to it, and relearned it..










~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ

weird, are there any advantages

is it just a CEL or does it not run right as well?

When i got it done, my car wasnt running right.. I thought it was because of the crank, but the timing was actually off a little bit. lol.. It wouldnt stay started below 1500 rpm....











~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ

Doing it with HPT, is NOT the same as doing it with a TEC-II.......

but most of the time it is not needed. i think the only time is when you install a new ECM.

if you guys want, i can past the procedure from SI...

Chris


'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08

sure, id like to see whats up, chris. si???

SI, GM word for Service Info...

Crankshaft Position System Variation Learn

Important: A crankshaft position (CKP) system variation learn procedure must be performed any time a change is made to the crankshaft sensor to crankshaft relationship. Changing the crank sensor to crankshaft relationship will not allow the powertrain control module (PCM) to detect misfire at all speeds and loads accurately, resulting in a possible false misfire diagnostic trouble code (DTC) being set.

Removing a part for inspection and then reinstalling the same part is considered a disturbance. A false DTC P0300 could be set if this procedure is not performed.

The learn procedure is required after the following service procedures have been performed, regardless of whether or not DTC P1336 is set:
• A PCM replacement
• An engine replacement
• A crankshaft replacement
• A CKP sensor replacement
• Any engine repair which disturbs the crankshaft/harmonic balancer relationship to the crankshaft position sensor

A fully warmed up engine is critical to learning the variation correctly. If a valid learn occurs, no other learns can be completed on that ignition cycle.

If the engine cuts out before the specified learn procedure engine speed or at normal fuel cut-off RPM, the PCM is not in the learn procedure mode. Review the crankshaft position system variation learn procedure and re-enable the learn procedure. Verify that the scan tool displays Test in Progress.

Caution: Before performing the Crankshaft Position System Variation Learning Procedure always set the vehicle parking brake and block the drive wheels in order to prevent personal injury. Release the throttle immediately when the engine starts to decelerate in order to eliminate over revving the engine. Once the learn procedure is completed, the control module will return engine control to the operator and the engine will respond to the throttle position.

Important: The battery must be fully charged and in good condition. Verify that the scan tool connection at the data link connector (DLC) is clean and tight before starting the crankshaft position (CKP) system variation learn procedure.

1. Close the hood.
2. Block the drive wheels and set the vehicle parking brake.
3. Put the vehicle in Park or Neutral.
4. Turn all the accessories OFF.
5. Connect a scan tool.
6. Start and run the engine until the engine is at normal operating temperature 85°C (185°F).
7. With the engine still running, use the scan tool in order to enable the crankshaft position (CKP) system variation learn procedure.
8. Press and hold the brake pedal firmly and raise the engine speed to the specified value of 3,920 RPM, RELEASING the throttle as soon as the engine cuts out.
9. Verify with the scan tool that the crankshaft variation has been learned.

A fully warmed up engine is critical to learning the variation correctly. If a valid learn occurs, no other learns can be completed on that ignition cycle.

If the engine cuts out before the specified learn procedure engine speed or at normal fuel cut-off RPM, the PCM is not in the learn procedure mode. Review the crankshaft position system variation learn procedure and re-enable the learn procedure. Verify that the scan tool displays Test in Progress.

If the variation will not learn, perform this procedure up to 10 times.


Scan Tool Display


Possible Causes

Factors out of range


The reluctor wheel-machining quality, a run out, or an incorrect air gap.

Opposing factors out of range


Disturbance-Noise on the crank sensor circuit. Reattempt the Learn Procedure.

Sum out of range


The engine is too cold. Reattempt the Learn Procedure.

Crank pulse count error.


Crank or Cam sensor DTCs is set. Repair the affected DTC first






Ya, i thought you needed a TEC-II, we did this with Brian's car last year.... seemed to "smooth out" afterwards, LOL to bad we did it after the bash, and a month before it got hit.

Chris




'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08

Hmm I actually wouldn't mind doing that... my car is on its second to me engine, and I've had a couple different crank pulleys on it now... going from the UO racing pulley back to the dampened high output pulley.

My car seems to idle pretty good and its dependable as hell, but it seems like it could run better for what I have done to it.

I'll have to ask around about who has a Tec-II up here.

would these 'DTC' codes harm performance??

ive never done this procedure on any of my cars... not one of them. my white car does not have the original block, OR crank...

so, HPT can do this then.. yes?

it can, all a DTC is, is a Displayed Trouble Code. so and you can have them in, but have no MIL\ CEL on.


we did it with HPT, with Brian's car, and really didn't do @!#$, did it when i had a Tec-II, and it seemed to run better.

Chris.


'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08

I guess Ill just have to see after its fired up lol..











~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ

any idea how much a relearn is at a stealership?

I'm not even sure Brad, I got mine done at monroe muffler lol. My friends dads shop.









~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ

oh, i wasnt aware other places besides GM had access to the 'tec 2' i thought it was a gm only deal...

anyone can buy a tec 2 as far as i know......it just depends if someone/some shop wants to fork up enough $$ for it...

^^Exactly, thats why my friends dad said he'll kick our asses if anything happens to it, even his store tech lolol..









~2014 New Z under the knife, same heart different body~
______________________
WHITECAVY no more
2012 numbers - 4SPD AUTOMATIC!!
328 HP
306 TQ

So which method is better. Hptuners OK, do what Brian posted, or.have the dealer do it?


PRND321 Till I DIE
Old Motor: 160whp & 152ft/lbs, 1/4 Mile 15.4 @88.2
M45 + LD9 + 4T40-E, GO GO GO

would definitely be the answer to ur problem, mike.



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