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Old 09-04-2011, 09:34 PM   #1 (permalink)
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Question Throttle Position Sensor gone bad?

I thought it was my transmission for a while, but now I'm having second thoughts-

My 03 has a few problems- first gear winding up, the shift is late and the motor revs before shifting- not OVER-REVVING, but to the point where I hit a speed (I forget now) and it'll rev a few hundred more RPM without picking up speed before it shifts.

When cruising at about 40, I floor it and it doesn't shift back into first, instead it gets really doggy and lumbers up to 55 or so at a steady-slow pace.

Dad's got the scanner from work so I'm gonna plug it in tomorrow hopefully and just see if it comes back with either a code or another problem.

I'm kinda hoping it's not the transmission because a TPS is about $35 at Advance Auto Parts, and a new Trannie (when it finally blows up on me) is upwards of $1000...

Thoughts? Suggestions?

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Old 09-04-2011, 10:08 PM   #2 (permalink)
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Sounds like just that. TPS. Same thing happened to me, my first thought was fuck. $700 for a rebuild, a Torque converter, rear main seal, flywheel, and a side of transmission fluid for breakfast.

But i just happened to be close to an auto parts store at the time, and had the car scanned. Came up TPS low voltage. $20 bucks later everything was good. Check all your fuses in the mean time until you get it scanned.

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Old 09-04-2011, 10:14 PM   #3 (permalink)
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Actually now that im thinking about it, the tps sensor caused my SS to idle like a savaged dog. Soooooo, id really would get that scanned cause unless your car is idling funny, along with your driving symptoms, it may not be the tps.... Hopefully thats all it is.

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Old 09-04-2011, 10:31 PM   #4 (permalink)
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sometimes when I start it it'll run like crap for 3 seconds or so, like it can't decide what rpm it wants lol but otherwise the Idle is alright... HOWEVER, I know that when I put it in drive, it'll hit 15-20 mph without touching the gas... that might be throttle cable adjustment though... I forgot to look into that last time someone mentioned it.

The scanner is really nice- my dad is the only one allowed to use it at work so he's allowed to take it home on occasion and he'll just scan our cars real quick for a check up. it's a great (and expensive) tool!

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Old 09-04-2011, 10:31 PM   #5 (permalink)
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oh and Kane, I see you got the Law marker on your profile- I was hoping to get you in on this thread too: http://www.impalaforums.com/appearan...w-members.html

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Old 09-05-2011, 01:32 PM   #6 (permalink)
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Ok, ran the computer with my car today- this is some of the Data:

first off, it came back with a P1811C code which is for "Maximum Adapt+ Long Shift"

it occurred at:

2157 RPM
216 degrees engine temp (Average)
22MPH
38% Engine Load
22% Throttle
7.39 MSFC- Injector Pulse


the 1-2 shift time (Ran it while driving) is a solid .3-.8 seconds. Wide margin, but it changes. We speculate the band is slipping or something else is sticking.


the code is for low or contaminated trannie fluid- I changed it about a month ago so the code might be left over. I checked today and it needed another quart or so for some reason, so I'm gonna re-scan it in a few weeks after driving and we'll see

Something tells me I'm gonna need a rebuild B/

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Old 09-05-2011, 09:01 PM   #7 (permalink)
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So your having shifting issues and hadn't even checked the fluid level. You changed the fluid, and never even checked it after that. ....Come on son, at least do some basic check's before asking for advice. Jeebus.

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Old 09-06-2011, 02:59 PM   #8 (permalink)
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I DID check it... I checked it about 2 weeks ago after running the motor for the proper amount of time) while talking to my dad about looking into it and it was fine, which also raises concern. then yesterday we ran the scan and checked a second time and it was low

Now even with added fluid it's not any better. The code must have been left over from before I changed the filter and fluid.

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Old 02-21-2014, 07:31 AM   #9 (permalink)
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????? what's the name of the tool used to change the TPS on a Chevy Impala? I am getting ready to buy one online (cause mine is triple what I'm seeing on here) and I need the tools to change it.

Thank you

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