HELP. Strange Sluggish Acceleration

[Composto86]

Hey Guys,

I picked up my 2017 GT350 brand new back in April from a tiny town outside of San Antonio and since have put around 4K miles on it.

Ive noticed a strange issue twice now that makes the car feel like its down down on power.
It seems to have 100HP for about 3 seconds before a switch is flipped and it feels normal again.

Today I figured out how to replicate it 50% of the time.
Can you guys see if your car does this as well or am I having a one off issue.

Either sport or regular mode (doesn't seem to matter).
Traction control on or off (doesnt seem to matter).
Cruise in 2nd gear around 3000-3250 RPM for at least 3 seconds and then floor it.

50% of the time the exhaust screams but the car doesn't really move as it normally does until it hits about 4250 RPM or so. The other 50% of the time it breaks the rear end loose with gobs of power.

Its almost like the variable valve timing is confused whether to activate or not.

[ame]

Frank

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[oldmachguy]

Try to post a video of it behaving "correctly."

 

[Composto86]

Fair enough, Ill post one tonight.

 

[firestarter2]

3250 is well before the power curve. My car wont break loose at that RPM.

 

[jasonstang]

You using good gas? Could it be engine pulling timing?

 

[Wriggly]

Doesn't sound right at all.

 

[Composto86]

Yes Shell Vpower 93.
Everything is at operating temp.

Here is how it normally feels


Here is another weak pull. Speedo pulled up on both for comaparison

 

[stanglife]

Miles? Sounds like TC kicking in.

 

[Composto86]

4200 miles.

Yes I agree it sounds like TC but it does it still does it with TC off.

Can someone give it a dozen attempts in their car?

 

[cking]

low gas level

 

[Composto86]

low gas level

3/4 of a tank.

 

[firestarter2]

3/4 of a tank.

Did you shift right at the start of that video? Maybe your clutch pedal sensor is off.

 

[Phil@JDM]

Throttle Position sensor / harness

 

[MrCincinnati]

4200 miles.

Yes I agree it sounds like TC but it does it still does it with TC off.

Can someone give it a dozen attempts in their car?

Try it with all the nannies off - not just the toggle for TC (hold it for like 10secs or whatever the wait time is)

 

[SiMuL]

Have you made any changes to the as-built configuration by any chance? (Using the FORScan app with a OBDII adapter.)

I had a problem similar to this after I changed the tire size setting to get my speedo showing the correct speed.

For whatever reason, it was confusing the ABS/TC system so the car was pulling power. Once I changed the as-built data back to a factory tire size, the issue went away.

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