Hesitation/Surging after SC install

[FASTFATBOY]

Originally Posted by MR.Sarge

Blower on the car is a Magnuson Heartbeat TVS2300 with the rotofab heartbeat Cold air intake system and FIC 1000cc injectors, and a MSD BAP. Per tuner, should put me at around 700rwhp but have yet to dyno it yet.

The MAP on the car is the one it came with, the 'red' MAP sensor (12592525), so wasnt a need to change it out. I know there is a 'blue' (55567257) superceded version of the MAP sensor unsure if that will make a difference or not but I was tempted to throw one on to see if it is in fact the MAP thats the problem.

Unless you have a cam and headers and or E85 it won't make 700 wheel.

I have the same 2300 Heartbeat setup but with the largest 96mm pulley and headers, with a manual trans it makes 535 wheel SAE with a stock LS3.

I just bought a 75.4mm Griptech upper pulley and 850cc injectors, it might make 600-610 if I'm lucky.

[gtstorey]

Without having an actual service manual in front of me, the P0107 is a circuit code based on internet search, not an out of range or bad information code. Needs to be confirmed with the service manual, but I would inspect the wiring for the map sensor then follow the service manual diagnostic.

Is your "NC" tuner PCMofNC?

[larry_g]

Sounds to me that they tried to tune around the problem instead of actually having to figure out why it wasn't working. Time to get back to basics and make sure you have good grounds, proper connections, and correct sensors in place.

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[SlowLS1]

Originally Posted by gtstorey

Without having an actual service manual in front of me, the P0107 is a circuit code based on internet search, not an out of range or bad information code. Needs to be confirmed with the service manual, but I would inspect the wiring for the map sensor then follow the service manual diagnostic.

Is your "NC" tuner PCMofNC?

I also believe it to be a wiring (ground) issue.

I can’t imagine Alvin would have spit balled numbers to him. I spent almost 2 months remote tuning my setup before he put it on his dyno. He is very thorough.

[gtstorey]

Originally Posted by SlowLS1

I also believe it to be a wiring (ground) issue.

I can’t imagine Alvin would have spit balled numbers to him. I spent almost 2 months remote tuning my setup before he put it on his dyno. He is very thorough.

If it is Alvin, I would guess we are missing some pieces of the puzzle.

[MR.Sarge]

Originally Posted by gtstorey

Without having an actual service manual in front of me, the P0107 is a circuit code based on internet search, not an out of range or bad information code. Needs to be confirmed with the service manual, but I would inspect the wiring for the map sensor then follow the service manual diagnostic.

Is your "NC" tuner PCMofNC?

I won’t name anyone specifically,especially since they were great to deal with when doing my long tubes prior, but there really is only one company that does remote tunes from NC.

I guess I need to do some troubleshooting, just unsure where to start if it’s hardware related. I assume MAP swap is easiest then maybe a smoke test for the vacuum line but will also check all engine grounds.

But to confirm to those above, every tune revision and data log I sent, I made detailed time stamps and notes of the hesitation and surge that was happening (happened every revision) and wasn’t told anything about it not being tune just a new revision to use there was a time they said they don’t see anything or thought that I was changing pedal position myself unknowingly with my foot (I was not) causing the surge.

This has been going on the whole tuning process (~2months) Til they saw they were happy with where it was at with the last tune where I still have the same problem, again sent data log to them for review and attention.

So with that I assume I am on my own to resolve the surging the 2 month I’ve data logged and constantly brought up of the surges and issues, being sent revision after revision without truly fixing it when it was brought up every data log.

If this is a hardware issue this whole time once I start trying to diagnose, I am not sure why I was given revision after revision of tune when it was constantly brought up as I’d assume that would throw off the data.
Correct me if wrong

[gtstorey]

You start trouble shooting diagnostic codes by getting the service manual and following the diagnostic steps. And especially if it is a circuit type code. Not impossible for a circuit code to be in the part, but the odds go down.

Without data files, it's hard to say if the surge you are feeling shows up in the logs. But you should have been logging accelerator pedal and the tuner could see if you were moving it. If you weren't moving it but the pedal percent was changing, that could be a problem.

[MR.Sarge]

Originally Posted by gtstorey

You start trouble shooting diagnostic codes by getting the service manual and following the diagnostic steps. And especially if it is a circuit type code. Not impossible for a circuit code to be in the part, but the odds go down.

Without data files, it's hard to say if the surge you are feeling shows up in the logs. But you should have been logging accelerator pedal and the tuner could see if you were moving it. If you weren't moving it but the pedal percent was changing, that could be a problem.

Guess I’ll have to grab a service manual then and try and troubleshoot where issue lies.

They were logging accelerator pedal position, here is the response I’ll post minus names about what they saw the one time it happened.

“I have a new file, but it doesn't look tuning related. It looks like you may have been jumping on and off the gas. The gas pedal isn't smooth there. It also spun so likely had ABS TCS interaction”

The last part, reading it now, seems to explain why I got the service stabilitrak the last time I drove the car (went away after I got to a full stop) and emailed them that when it happened.

I don’t believe I was on an off gas, I know not to, but from that time I made every effort consciously to maintain pedal position when data was sent back.

But for now I will have to find a service manual and see where to start

[MR.Sarge]

Update for those that are interested:

Smoke tested for vacuum leaks and ended up replacing the MAP sensor. Turns out I had a faulty map sensor from the start and everything instantly smoothed out. So all those hesitation issues I had from the start of the tuning process are all atributed to the bad MAP sensor. Sent a log and they are now making more updates as that likely threw off the tuning.

So seems tuning was done around a problematic MAP sensor.

I ultimately had enough of the back and forth mail order tuning and the second guessing everything going on with the car and brought my car to an LS expert 3 hrs away and within 3 hours he got it working flawlessly, it drives amazing and feels way different from when I was tuning over mail order. He did question why SD over MAF and I explained the troubles that was seen trying to get MAF to work and getting car above 4k RPM without breakup and thats why tuning was done in SD. First tune file he loaded in from my stock file, he got MAF working no problem.

Do not recommend going mail order route, especially after all this and the tuning issues i had, I know issues come up with FI and tuning and its a process, and I totally get that and beared with it for 2 months but it was not a good experience ESPECIALLY when I consistently every revision brought up the hesitation and surging issues I had, felt like it was overlooked and was tuned around.

[larry_g]

Thanks for the update and congrats on getting it working. Now go enjoy it!

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