05slpGT

Yes those are pedal position %. I will check out the throttle plate, i think i know what to look for. and it doesnt seem to follow my foot. it seems to just jump anytime i just barely touch the throttle. im about to just go out there and set up 2 cameras, video of inside the car and a video the gas pedal and start driving around, lol.
Heres an example, say im just cruising down the road, not trying to haul *** or anything. driving in (these arent real exact numbers) 3rd gear at about 40MPH at about 3k RPMs, hell even 4th gear, even when i am just trying to drive chill and i slowly let off the gas to decelerate by 5mph, the car will act like i just let off at 5k RPM and jerk foward and backwards and you will hear a clank noise, now at this low of a speed (40mph)its not like slamming the breaks, but its def uncomfortable especially for passengers and i know the car shouldnt be doing this because a buddy of mine who has the almost identical mods in an 06 GT drove my car and let me drive his and we both agreed there was something wrong.

Norm Peterson

Fuel cut issue?
Cam phasers doing something wonky?


Norm

05slpGT

You just reminded me, a couple years back i kept getting a code that read Camshaft position sensor and every time i took it into a shop it would have gone away by then and the car didnt really show any major problems. Not sure if that could have anything to do with my problem, but thats why im on the forum.

05slpGT

So... it turns out that the throttle body was messed up, getting barely any power. But it wasnt because the throttle body was bad... its because the battery was bad. It was like a 600CCA battery (not the stock one) and it couldnt handle the electronics in my car for some reason? And i dont even own subwoofers, just 4 aftermarket speakers and a double din head unit. Anyways, got a 710 or 720 dry battery and the car is driving like it has NEVER driven. When i let off the throttle the car just smoothly revs down. Im not even exaggerating, just changing the battery has made the car drive incredibly better than when i first bought it.

JAMAMAN

Thanks for the update, I would have never guessed that a run down battery can cause that. I will probably change mine soon cause i have the stock 590 and i have all kinds of amps and subs.

Norm Peterson

Nor I. My experience with weak batteries and/or dead/dying alternators is that when the system voltage drops down under about 9v the injectors don't fire at all and you can't even start the thing.

Thanks. Something to file away for future reference.


Norm

wcgman

I've had a similar problem with just strangeness in the car. The radio would act all bizarre about 2 yrs into the stock battery. Swapped in I believe like a 750 or 770 and all was well.

timmbo

Not talking about you, but what kills me is when you see people post on here "hey, just jumped off my car cause my battery was dead and I'm wondering why it's running rough". "It ran fine when I started it 3 weeks ago". LOL. Duh.....engine electronics need stable voltage to operate properly and ya ain't gonna get that from a dead battery that's just been jumped off. I just got to the point where I don't even help with those threads anymore lol. ALWAYS load test your battery first before anything else. Basic law of electrical troubleshooting.

7gtthrilla

Wow that's crazy! Who knew. I might invest in a bigger battery now that i know this. Thanks

bigblue95z

Have you tried the throttle recalibration. It's in a thread around here somewhere. I haven't read the whole thread so maybe someone has mentioned it.