Search:

Long post but I'm trying to be thorough so bear with me, having massive problems with my 2018 GT MT82 to T56 Magnum XL swap.
2018 Mustang GT, turbo car, bought from dealer so I have no idea whats...

Minor update;

Really hard to find a pin out of the FPCM online, especially for an LSA car. But I found one with diagnosis procedure on the 07+ trucks.
Followed this video and directions here;...

gtstorey thanks for the info, but honestly I'm so turned off by the car the last thing I want to think about is redesigning the fuel system now that I have nearly a grand in new stock fuel system...

gtstorey, does that bypass the FPCM entirely? Able to run returnless? I'm still learning about this fuel system...the more I learn the more I get confused, seems overly complicated.

Thanks for the replies, I'll try to answer all the questions and suggestions.

I'm sure the amazon parts are fine (some from rock auto as well), based on the fact that the car literally ran the...

Update...

Thanks for the replies, yea I replaced the pumps with brand new AEM ones, inside the stock basket easy plug and play and are said to support PWM no changes required.

When these...

Minor and probably final update.

Dealer wasted my time and money for a month.

First diag was that the injectors were losing pressure and they needed to be replaced, but they couldn't guarantee...

Minor update.

Tried calling multiple performance shops in/around GA area, people suck at getting back and answering questions.
One shop did give me a rough diagnosis and bet the fuel pumps were...

Update, unfortunately this has not been resolved yet.

The fuel pump assembly I ordered was wrong, looks like the only real "V" one is the $1500 version, not liking that option. Sent that back...

Current tune is 100% stock, feels very slow and thats what got the 17+ AFR at WOT.

I'm curious, but I don't know if it really matters at this point what the original tune in the car would have...

Yup, that's exactly what it is.

Can't find the aftermarket hat that isn't on backorder, but found a new pump assembly for about $300 on summit, so at least that whole section will be new.
Not...

Ahh thanks, I found comparison log earlier but didn't know of that function and I see DTC listed now. Just wasn't sure if it would work since I couldn't see/scroll through the whole list.

Got my...

I changed all the normal parameters to stock, but it doesn't look like I can see what would be in the stock DTC list.
The whole thing comes up blank when I open any file that isn't the one I'm...

Minor update, pulled up seats, no access panel, and no proof of swapping or adding in a BAP or anything so I don't think its been messed with much.
However, I pulled the rear fuse block out, tried...

Trying to get my nomenclature straight...

FPCM is the actual module/controller thing, and FSCM is the "Fuel Sys" tab in HPT, correct?

I noticed nothing in the HPT Fuel Sys section, but you're...

Appears to be mechanically stock! I'll go back to a hopefully stock tune that I downloaded from the repository to mirror.

Yea sorry I think its a little confusing, I've been going back and forth between the tunes to try to figure out what is going on with the thing.

as Dhoagland mentioned, I'm guessing its lean, on...

Update, took the car to autozone and borrowed their fuel pressure tester, confirms its what the computer sees.

Here's a log on the original tune that came with the car as I drove there, no WOT as...

Here's a pull with the Original/Initial tune on the car when I received it with FSCM.

I'm comparing it with the Stock V tune I pulled off the repository.
I assume the "Fuel Sys" tab at the top is...

Oh wow I hadn't even considered anything like that and I wouldn't have known to look for that...thanks! I will investigate and update!

EDIT: I know you can tune the FSCM separately for 1...

Lots of info coming, trying to be as thorough as possible here so bear with me...TLDR at the bottom.
Definitely a noob tuner as well, but I'm just trying to get to stock right now.

2009 CTSV...

Update, I barely know anything, but now I'm dangerous...

IDK if this is how you should do it, but I changed stoich boxes and PE to get a solid 12.6 afr out of it, and now it has 24* of timing....

IDK what happened, but whatever parameters I used in the engine side of the tune (trans stock) it locks the trans in like 4th gear. No warnings or anything. Takes off in 4th, stays in fourth in D, S,...

I think you're right. But you would think an experienced tuner would realize not even 20* WOT on a very mild LS2 is not normal.

I would also think that if it was knocking, it would continue...

Update, filled up the car at a different station with 93 again, ran it in paddle shift, and regular mode to eliminate those, almost no change, lots of knock.

Went back to the original tune from my...