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Posted

My mechanic hooked up the computers to it for the first start this morning and showed a "lean" code at the start. The injectors and everything else have been checked and or replaced i.e fuel pump/regulator and it has been narrowed down to the Tune. The tune some where or some how relearned itself to compenstae for something and it is making the truck start way lean hence all the stumbling and bumbling upon first start. Now the person who tuned it said that is impossible that all of a sudden a tune messes up so I called Frank and he said that very well could have happened and since I have changed or checked the other possibilities the PCM is the only thing left that could be causing or telling the truck to start lean due to timing. So thanks Frank the PCM is on the way and if your as good at tuning as I have heard I will not be dissapointed. Hopefully my new tune will be back on or by friday so I can get it in and come sat. morning hopefully it will fire right up.

 

Sorry for the long post.

Posted
I imagine you wont be recommending Brian anymore for tuning. thats a real bumber.

 

I like Brian I jsut didn't like how he basically called my mechanic an idiot. His words were "I should grab something and smack him over the head" because a tune does not change over time if it worked before it will work now. I was happy with his tune until that comment. My guy builds drag cars for a living and is GM Certified yadda yadda he knows what he is doing and says he has personaly delt with vehicles that the PCM relearned itself. So I got a 2nd opinion and Frank aggreed with my mechanic that the tune is more than likely the culprit.

Posted (edited)
My mechanic hooked up the computers to it for the first start this morning and showed a "lean" code at the start. The injectors and everything else have been checked and or replaced i.e fuel pump/regulator and it has been narrowed down to the Tune. The tune some where or some how relearned itself to compenstae for something and it is making the truck start way lean hence all the stumbling and bumbling upon first start. Now the person who tuned it said that is impossible that all of a sudden a tune messes up so I called Frank and he said that very well could have happened and since I have changed or checked the other possibilities the PCM is the only thing left that could be causing or telling the truck to start lean due to timing. So thanks Frank the PCM is on the way and if your as good at tuning as I have heard I will not be dissapointed. Hopefully my new tune will be back on or by friday so I can get it in and come sat. morning hopefully it will fire right up.

 

Sorry for the long post.

 

What would cause the tune to relearn itself? I wonder if I need to retune the PCM every so often? I don't need a lean condition with FI.

Edited by SSThunder (see edit history)
Posted
What would cause the tune to relearn itself? I wonder if I need to retune the PCM every so often? I don't need a lean condition with FI.

 

i dunno my fuel pump could have been going bad and it tried to compensate for the fuel pressure loss or something. I really dont know the details but from what i have been told a PCM can learn from your driving habits sorta speak and adjust itself.

Posted

WOW! Good 2 hear ur figuring it out Brad. :thumbs: Now it makes me wonder about this Superchips programmer... can it relearn too? :confused: I mean all it does is "swap data"...

Posted
WOW! Good 2 hear ur figuring it out Brad. :thumbs: Now it makes me wonder about this Superchips programmer... can it relearn too? :confused: I mean all it does is "swap data"...

 

Maybe your dealing with a computer and IMO computers are capable of anything.

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