Pcm tune
Joined: Feb 2008
Posts: 6,460
Was the car running ok before the new PCM? If you're having that many issues getting it to run right, I really wonder if they tuned it wrong. Defintiely wouldn't be the first time a vendor has sent an improperly tuned pcm by accident.
Just thinking if it ran fine before, but now is all jacked up, I'd send the pcm back first for them to verify.
Just thinking if it ran fine before, but now is all jacked up, I'd send the pcm back first for them to verify.
Thread Starter
Joined: Jun 2018
Posts: 122
Yes it ran fine after the swap the car cranked no issue with a jump I started the forum and was told the n/a settings were to harsh for the l67 so I was looking for a tuner to tune the pcm and went through zzp was told by the lil customer service rep popped up and I told them what I did and they said I needed those changes for the pcm. Should I have tim look over the settings for the car cuz I talked with this guy from advance auto in the commercial department and he said with the issues it sound like they lowered my fuel trims to low while driving they are at around -5 - -32 while on the pedal and drops.back to around 0 -5 but the only codes i have are evap codes 1441 0443 or 442 441
will check out the info and fix and make sure correct sent of monte pcm hope same issue doesn't occur tune is worth it just not this issue
the trim is actually 10.8 and -18 while driving and idle code is 0443 and 1441 and monte pcm came back today finna go install
will check out the info and fix and make sure correct sent of monte pcm hope same issue doesn't occur tune is worth it just not this issue
the trim is actually 10.8 and -18 while driving and idle code is 0443 and 1441 and monte pcm came back today finna go install
Last edited by 04l67; Jan 17, 2020 at 12:42 PM.
Joined: Feb 2008
Posts: 6,460
If the car ran fine after the pcm swap, and all of these issues happened later, then it's probably not a pcm wrong tune issue. That would've been immediately apparent.
These fuel trim numbers - which is STFT and which is LTFT? I normally dont worry about trims at all on a canned pcm tune like this because theres nothing you can do about it. It's never going to be spot on like a custom tune because it's just a generic adjustment that they make.
I will say though, the numbers look really wild though -32, -18, etc they shouldn't be getting that far or of whack (and TBH, I never knew they even went that low). If it ran fine at first though, I still struggle to blame the pcm as it's likely a maintenance issue.
Per the Advance Auto suggestion, it doesn't sound like he knows what he's talking about. You dont adjust trims when doing a tune, trims are the pcm reaction to trying I hold 14.7 at the O2 sensor. But to make it freak out like this, they would've had to add an absurd amount of extra fueling somehow- a wrong MAF table, wrong injector flow rate table, etc and you would've noticed that almost immediately and saw it in the STFTs.
cuz I talked with this guy from advance auto in the commercial department and he said with the issues it sound like they lowered my fuel trims to low while driving they are at around -5 - -32 while on the pedal and drops.back to around 0 -5 but the only codes i have are evap codes 1441 0443 or 442 441
I will say though, the numbers look really wild though -32, -18, etc they shouldn't be getting that far or of whack (and TBH, I never knew they even went that low). If it ran fine at first though, I still struggle to blame the pcm as it's likely a maintenance issue.
Per the Advance Auto suggestion, it doesn't sound like he knows what he's talking about. You dont adjust trims when doing a tune, trims are the pcm reaction to trying I hold 14.7 at the O2 sensor. But to make it freak out like this, they would've had to add an absurd amount of extra fueling somehow- a wrong MAF table, wrong injector flow rate table, etc and you would've noticed that almost immediately and saw it in the STFTs.
Thread Starter
Joined: Jun 2018
Posts: 122
My bad the fuel trims goes to -18 while driving the lowest it goes and it usually stays around -5 and +3 short term long stats between -18and 10.8 as the car ran fine after the engine and transmission swap car runs fine with the pcm tune just wont start with out starter fluid installed the monte pcm and no issues on start yes thank you but didn't drive it as for the grand prix changed plugs icm fuel rail injectors and fuel pump and crank sensor
Last edited by 04l67; Jan 17, 2020 at 01:59 PM.
Joined: Feb 2008
Posts: 6,460
When you say it starts only on starter fluid, but the monte pcm starts fine - do you mean the monte pcm in the GP starts fine - or the monte starts fine with the new pcm installed in it?
Thread Starter
Joined: Jun 2018
Posts: 122
Yes the second one the monte started up with the new pcm installed earlier didn't drive it just let it idle
but u say the long term for the grand prix being in double digits is not good because my minte stft and Lyft are 16.4 and 20.3
can't find no leak but I don't have a lean code
but u say the long term for the grand prix being in double digits is not good because my minte stft and Lyft are 16.4 and 20.3
can't find no leak but I don't have a lean code
Last edited by 04l67; Jan 17, 2020 at 08:00 PM.
Thread Starter
Joined: Jun 2018
Posts: 122
positive on the mc I had this issues for the longest thought it was the maf sensor of the o2 sensor didn't really affect driving
