LTFT creeping negative, AFR's staying normal?

[Gloonge]

https://datazap.me/u/gloonge/log-159...data=2-9-11-14


Hoping someone can help me make some sense of this nonsense.


Been running this tune for a week or so, and up until today LTFTs have stayed between -7 and -2 for the most part. Today I noticed that at idle and light throttle with the a/c off the LTFTs go to -20 or more. However AFR is normal.


Edelbrock supercharged, uel headers, custom tune from Shiv.

[kev0]

If it's not the tune, then it's probably bad coil packs/spark plugs since 2013-14's were plagued with bad coil packs. They revised the part later on for 2015+. You can get the new coil packs, but then you need to grab the new harnesses as well.

[Gloonge]

Originally Posted by kev0

If it's not the tune, then it's probably bad coil packs/spark plugs since 2013-14's were plagued with bad coil packs. They revised the part later on for 2015+. You can get the new coil packs, but then you need to grab the new harnesses as well.

Mine is a 13'. The car runs fine other than this little bit of data, no stumbling or hesitation. Is there any way to test for this before handing over a few hundred dollars for coils and a harness?

[Gloonge]

Today my a/c compressor started knocking loud enough for me to hear it. The bottom bolt backed out. After snuggling that back up the fuel trims seem to have gone back to normal.

So I am assuming that either the belt was slipping or the knock sensor was picking up the vibration. Either way the issue seems to be gone.

Figured I would pop back in there and let everyone know so the search function helps someone some day.

Thanks.

[theneptune86]

Yikes, good find!!

[Gloonge]

Originally Posted by theneptune86

Yikes, good find!!

It sounded like clutch chatter for a few days cause it only happened when trying to start in first gear. Then it was constant so I could hear it at idle.

I'm telling you, forced induction has been the biggest pain in my ass, issues left and right. But that sweet blower noise and power balances out the bs.

[kev0]

Originally Posted by Gloonge

Today my a/c compressor started knocking loud enough for me to hear it. The bottom bolt backed out. After snuggling that back up the fuel trims seem to have gone back to normal.

So I am assuming that either the belt was slipping or the knock sensor was picking up the vibration. Either way the issue seems to be gone.

Figured I would pop back in there and let everyone know so the search function helps someone some day.

Thanks.

Can you grab a picture of the bolt that was loose on the compressor when you get a chance?

[Gloonge]

Originally Posted by kev0

Can you grab a picture of the bolt that was loose on the compressor when you get a chance?

Will do. It was the lower bracket bolt though. Making and awful noise.