Idle surging up and down

[Camarovon]

New to tuning where do I start at to fix this

[5FDP]

Perhaps you should think a little longer before posting.

You didn't provide any details on anything, no vehicle, no mods, no nothing.

I'd search for your issue aswell, surely it's been covered before.

[Camarovon]

Its a 2001 camaro with a 408 with tfs 245s with a fast 102/102 tsp cam 244/248 vig nitrous converter 3800 intake is ported, tsp 100mm mass air, 42 pound injectors

[Widebody06]

With that question and 24 posts, I'm thinking you havent spent the time reading and thinking thats going to allow you to learn tuning...having someone give you answers will teach you a lot less than a few hints requiring you to figure it out your self. Your problem might be the most common subject here...you really dont want to find "the" answer, you need to find all the factors involved that influence idle and learn how to make them right.

[BBA]

With that question and 24 posts, I'm thinking you havent spent the time reading and thinking thats going to allow you to learn tuning...having someone give you answers will teach you a lot less than a few hints requiring you to figure it out your self. Your problem might be the most common subject here...you really dont want to find "the" answer, you need to find all the factors involved that influence idle and learn how to make them right.

I disagree. The reason most people buy HPTuners for non-commercial purposes is to find a fix to a specific problem, not necessarily to be an expert at all things. It would help the cause of HPT if we all help to make HPT owner experiences as painless as possible. If you want to be an elitist, that's your choice, but the way I see it is anything that improves the customer experience is good for all.

Now, to the OP, please post your tune file with some logs of when the issue occurs. Use the VCM controls in the scanner to see if anything makes a difference and if something does, such as turning Idle spark on or off manually, log the differences and post the log.

[Widebody06]

BBA, If I'm an elitist, then this place is the elitist Mecca. You had no way of knowing but whats above is my second post- the first I deleted and it included the question of just what do you want out of this...a fix only for your surge, a good idling car or learning how to deal with such.
I finally decided anyone who is willing to spend $600 for HPT and has posted 24 times wants more than a canned answer that may or may not really fix the real issues. Surging as far as I can tell is as common as cam installs...do one, you get the other.
How can the OP not know the protocol here for getting answers...I'm no rocket scientist and yet it only took 2 posts to realize an improperly phrased request or question will get ZERO responses. And those questions included the situation, the specific PCM, addons etc and logs/tune.
So my response was taylored to one thing...playing the game by the 'rules' that work here.
And in my defense, unlike the masses here, I at least answered.
Your points are not only valid but an important comment on why more people should chime in- first and foremost HPT tech people. The stickies are old, dead links offer only frustration and info is cross posted without regard to applicability of which generation its for.

Perhaps one of the most important lessons here apply to all of us...helping others furthers your own education and understanding. My car came with a supposed pro tune yet its proven to be easy for a screaming green newbie to improve it dramatically, that tells me too many people learn a few tricks, label themselves tuners and propagate the notion that tuning is hard. Its not hard, it just takes time and a open mind to learn a complicated system.

[Widebody06]

Heres some actual help on the surging issue- try raising the values in Fuel/Injection timing/Normal ECT by increments of 10 until surging stops assuming the first increment shows some improvement. Dont change the values below 68*, let the car warm up some before deciding if you're getting results.
Try reducing VE table values by 60/40/20% (multiply by .4, .3, 2) at 400, 800, 1200 respectively, log spark advance at idle...if its low or negative and surging too, the PCM is doing its best to control the idle but cant...continue to reduce VE until advance increases and become more stable.

These things will help if you have a fundamentally correct tune, if you've boogered with advance or other factors, you need to let us know and likey need to return to stock on those.

Do one at a time, not both. Post your tune and logs and give us the backround to how this surging started.

[Camarovon]

Thanks guys I will post my tune and logs on monday

[Camarovon]

I posted my tune

[Camarovon]

my tune log

[Brice]

I had a quick look to your tune and logs...

You don't have ltft and stft values on your log (enable on the tune you have post) ... and the 02 voltage are very different between bank 1 and bank 2.
Do you have DTC code ?

[Camarovon]

No dtc code , what could cause the O2 sensor to do that

[Camarovon]

What do yall think

[blown00ta]

Mine did that once found it was my injectors on driver side went bad.... Swap them out see if that helps

[Camarovon]

Mine did that once found it was my injectors on driver side went bad.... Swap them out see if that helps

Injectors are good