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View Full Version : Switching to stock PCM. Crank re-learn neccessary?


AuburnTiger
07-04-2008, 09:24 AM
I'm ditching my W84me tune and going back to the stock PCM. Is there a chance that I will throw a CE light when switching back to the stock PCM?
DarkCharisma
07-04-2008, 10:06 AM
Nope, the stock one was already in your truck, and is already calibrated.

Any reason why you're ditching the W4M? I'm thinking of tossing mine as well.
Stratosman
07-04-2008, 10:33 AM
you won't see any codes, but should do a re-learn
AuburnTiger
07-04-2008, 10:48 AM
you won't see any codes, but should do a re-learn

Any specific reason?
AuburnTiger
07-04-2008, 10:49 AM
Nope, the stock one was already in your truck, and is already calibrated.

Any reason why you're ditching the W4M? I'm thinking of tossing mine as well.

I'm ditching the W4M tune because the only difference I noticed after the tune was a 2 mpg gas loss...
Stratosman
07-04-2008, 10:53 AM
Any specific reason?

The CPS needs to be "learned" to the "new" PCM each time you change it-or so I've been told. Even if it's the original one-it doesn't have any way to remember what it was.
Aloicious
07-04-2008, 11:52 AM
The CPS needs to be "learned" to the "new" PCM each time you change it-or so I've been told. Even if it's the original one-it doesn't have any way to remember what it was.

Kinda. the original PCM does retain the CASE data unless there is some problem with it or it's been CASE'd to a different vehicle, so you shouldn't have to do a re-learn. you would however want to get a CASE done if the PCM you're putting in hasn't had one done on your truck before.
ChopandDrop
07-04-2008, 12:10 PM
Nope, the stock one was already in your truck, and is already calibrated.

That's exactly right. The original PCM will plug right and and you'll be fine.

That's strange that you didn't notice any difference. Maybe you should contact Jesse and see what's up. I've had my tune for over 3 years now, and I love it. After the initial break-in period, I could tell a big difference in performance, but my MPG did go down some.
chevydeth
07-04-2008, 01:58 PM
I ditched my W4me for a Wheatley tune, so much better!!
AuburnTiger
07-04-2008, 02:14 PM
That's exactly right. The original PCM will plug right and and you'll be fine.

That's strange that you didn't notice any difference. Maybe you should contact Jesse and see what's up. I've had my tune for over 3 years now, and I love it. After the initial break-in period, I could tell a big difference in performance, but my MPG did go down some.

I contacted him and he wasn't much help. I value the extra MPG right now anyway.
Underpowered
07-04-2008, 02:21 PM
hmm. i got a solid 2mpg gain with my blackbear tune, you should definitely not lose any mileage.

but as for your origional question, if the PCM was ran in your truck before, and calibrated for your truck it will plug right back in, no problems at all.
AuburnTiger
07-05-2008, 08:21 AM
hmm. i got a solid 2mpg gain with my blackbear tune, you should definitely not lose any mileage.

but as for your origional question, if the PCM was ran in your truck before, and calibrated for your truck it will plug right back in, no problems at all.


I did not get a MPG tune from Jesse. I got an "aggressive" 89 octane tune which I felt no performance gains from and a decrease in MPG.
DarkCharisma
07-05-2008, 08:23 AM
I got about .5 to 1 out of my Wait4Me, I just wish he didn't have so many "Secrets." I paid for it, I want to know what was changed, damnit. :teddy: