Hesitation during acceleration - Team Camaro Tech
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Old Mar 19th, 07, 05:50 PM   #1 (permalink)
Join Date: Mar 2007
Posts: 2
Hesitation during acceleration

I have a 1999 v6 5 speed camaro with 133,000 miles. Recently I noticed that when I punch the throttle or even during slow acceleration the car will hesitate or "catch" in a way, its like the throttle is cutting in and out or somthing...
The wierd part is that in nuetral it revs out perfectly fine engine runs smooth as silk, once in gear and slow acceleration it can be perfectly normal but once you punch the throttle it will do the hessitation untill you untill you let off the throttle. This happens in all 5 gears and at all rpms, its not as bad in first gear and somtimes it does not happen at all, I would say 1 out of every 10 times I drive it runs perfectly normal.

My dad scanned it at work and got the following codes:

P1272C APP sensor 1,3

P1275C APP Sensor Curcuit 1

I have also done the following: New fuel filter, the spark plugs and wires are fairly new, checked and cleaned air filter, and ran fuel injector cleaner through it various times.

So Im thinking throttle body sensor may be bad, clutch may not be engaging correctly? although it shifts fine and seems to work perfect..........or the Accelerator position sensor may be bad....

Everything in my accelerator is electronic no cables to the throttle body, the tps sensor is inside the Throttle body so to replace that is the whole unit, just thought I would ask and see if anyone had any ideas or knew of a problem similar to this?? thanks alot
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Old May 25th, 07, 10:24 PM   #2 (permalink)
Join Date: May 2007
Posts: 20
Re: Hesitation during acceleration

I've got a similar problem on a 97 z-28 with an auto tranny and the 5.7L 8 in it.

I haven't seen anything that really seems to be the same problem discussed on this site, but your problem seems eerily similar. I assumed that it was injectors/fuel filter at first also, but the problem has worsened since replacing the filter and running some cleaner in a few tanks.

Any help from some gurus? If not, at least misery loves company
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Old May 26th, 07, 07:04 PM   #3 (permalink)
Join Date: Jan 2007
Posts: 1,163
Re: Hesitation during acceleration

look at the cat converter in both cases...they are extremely prone to going tits up, and causing hesitation...my uncle`s car went thru 5 cats by 130000!!!the dealer wont cover them anymore, so next 1 he`s gonna dump the car...the drive by wire in the v6 isnt something i`m real farmiliar with, so couldnt say if the tps is doing u wrong, but its prolly more likely on your car than on the cabled v8...but i`d think it would happen in all gears if it happened at all...could be the code is being called because the cat is confusing the comp thru o2 readings...
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Old May 27th, 07, 01:18 AM   #4 (permalink)
Join Date: May 2007
Posts: 20
Re: Hesitation during acceleration

Thanks for the help kustom .

Seems like there are even more multiple possible problem points on this one than I assumed starting out, but also good point on the cabled v8 versus wired v6. Much appreciated.

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