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Help the New Guy Gen 4 Corvette - Idle goes to hell after VE tune

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Help the New Guy Gen 4 Corvette - Idle goes to hell after VE tune

 
Old 05-27-2019, 04:09 AM
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jfiely
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Default Help the New Guy Gen 4 Corvette - Idle goes to hell after VE tune

Ok, so I have been going step by step with my tune after mods. I have done both MAF & VE tuning more than once. After I log and tune my idle goes to hell. Not sure what I am doing wrong. I have started from scratch twice now. Any suggestions would be appreciated.

2009 Corvette LS3 A6 Base 14K Miles: Vararam Snake Charmer CAI, Livernois Motorsports Cam/Springs ect - Stage 2C
Intake Lift [email protected]
Exhaust Duration [email protected]
Intake Lift .620"
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LSA 117

Livernois Ported Heads & PFADT Series Tri-Y Long Tube Header & X-Pipe w/Cats

HP Tuner Pro setup.

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Old 06-03-2019, 08:37 AM
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jim2092
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Not getting answers because there are so many possibilities. Who did the engine work? Was the idle bad before the tune? What does "bad" mean? Do your tunes change the idle? Lets start there.
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Old 06-03-2019, 03:41 PM
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jfiely
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Originally Posted by jim2092 View Post
Not getting answers because there are so many possibilities. Who did the engine work? Was the idle bad before the tune? What does "bad" mean? Do your tunes change the idle? Lets start there.
I did the engine work, no issues there - easy. Peferectly smooth idle before. I think I am getting there. Seems like fine tuning the airflow is making a world of difference. The tuning does make a difference in the idle. Right now the spark seems to be jumping around a lot at idle, maybe normal with all the air controls? I am out of town this week. I will post the most recent tune and log soon. Bad idle - surging and fluxuating. Up and down 50-100 rpm at times. Doesn’t die or surge from P to D now.

Last edited by jfiely; 06-03-2019 at 03:43 PM.
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Old 06-04-2019, 09:15 AM
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Your answers are here.

https://forum.hptuners.com/showthrea...al-Information

What adjustments to the tune are you making before MAF and then VE tuning?
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Old 06-07-2019, 04:46 AM
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Not sure if you solved the situation but... for some reason, gen4 ECUS run rich briefly after flashing. Don't log/tune off of initial few drives. There was a thread on HPTuners about this but i forget where it was.
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Old 06-11-2019, 01:43 PM
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Originally Posted by Ahrmike View Post
Not sure if you solved the situation but... for some reason, gen4 ECUS run rich briefly after flashing. Don't log/tune off of initial few drives. There was a thread on HPTuners about this but i forget where it was.
There’s an injector offset vs injector temp table that mostly causes this.

Injector temp resets after a flash and takes a little bit to get back to normal values.

Some tunes have that table available to be updated as needed, others don’t

Last edited by schpenxel; 06-11-2019 at 01:43 PM.
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