I have a similar problem every once in a while. I mash the gas at like 25-30 and it stays in like 3rd gear at less than 2000 rpms. It has only happened a few times, but it is quite frustrating.
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2002 Auto V6 Mineral Grey Mustang:
Go mods: U/D Pulley, BBK CAI and 65 mm TB, Pypes Violators dual exhaust with stock cats and an h-pipe, upper intake spacer, j-mod, SCT X3 tuner, and 3.73 gears and t-lock.
Show mods: Sequential tail light kit, GT fog lights, 8" shorty antenna, hood shocks, HID headlights, 17x9 inch Mach 1 rims wrapped in Vredestein Ultracs, and a chin spoiler.
the pcm uses rpm's, vehicle speed, and throttle position to decide how and when to downshift.
when you slam on the gas you are telling your car that you want to go faster. the pcm responds by downshifting.
when the pcm triggers a downshift, it will either go to as low of a gear as possible, or as low of a gear as it thinks you want to go to. how does the pcm decide which gear? by combining the signals from the CKP, the VSS, and the TPS.
the TPS is a a vital piece of information to the PCM when deciding when and how to downshift.
this is the most helpful piece of information posted so far. so thanks. fyi everyone, i know the general attributes of how an auto transmission works and behaves. its just with this new throttle body its acting up. when i was transferring the TPS from the factory tb to the BBK one, i recall maybe tweaking it cuz i put it on wrong at first and maybe overspun it. should i buy a new one?
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2002 White 3.8L Mustang
-Bomz Racing Cold Air Intake
-BBK 65mm Power Plus Throttle Body
-LED lighting: Amber Front Turn Signals, Super White Interior Dome Light&Reading Lights, Rear Brake Lights + Turn Signals
-Mach 1 Chin Spoiler
-Yellow Calipers
-Debadged Rear
...the TPS is a a vital piece of information to the PCM when deciding when and how to downshift.
Thanks for adding all the info about how electronics interact and affect shifting... I don't know much about all that. That's cuz my TPS is usually at 100%
Quote:
Originally Posted by jakksincorpse
sorry i dont know anything about auto tranny's in my mind i thought since the car has an ecu and an "automatic" transmission shifted for you i thought thats what the whole computer system was about. i knew there was transmission fluid but i thought that was just lubricant.
Why dont all of you inform me instead of ***** at me. that would make alot more sense.
This is why we don't "inform" you - cuz you blast people and start cursing. And actually, people have tried to help you (I checked your other threads) -- and you just got mad and started spouting off about hating Stangs and "imports rule". So now we all choose to just ignore you. BTW - name-calling gets you nowhere when asking for help. Go back to Iceland.
Quote:
Originally Posted by pball4lyfe
this is the most helpful piece of information posted so far. so thanks. fyi everyone, i know the general attributes of how an auto transmission works and behaves. its just with this new throttle body its acting up. when i was transferring the TPS from the factory tb to the BBK one, i recall maybe tweaking it cuz i put it on wrong at first and maybe overspun it. should i buy a new one?
Ah... now the truth comes out! j/k - but yeah, that could be the cause of the problem. You say you tweaked it: could you explain a little better? Cuz I think you're onto something.
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YELLOW JACKET = 1998 Chrome Yellow V6
POWER: BBK CAI, TB, UDPs; Bosch Platinum +4 plugs
BEAUTY: black projector headlights, taillights, and mesh grille; 5% tint; shorty antenna; interior billet
ROLLERS: XXR 006 black spoke with blue lip; 18x8.5 & 9.5; BFG KDW/2 245/40R18 & 275/35R18
DRIVER: Jonathan, 6'2, 190 lbs
RIDER: my wife, 5'4 brunette hottie and my 1st baby on the way...
Last edited by pcfrisch; 06-25-2009 at 02:14 PM.
Reason: Language
this is the most helpful piece of information posted so far. so thanks. fyi everyone, i know the general attributes of how an auto transmission works and behaves. its just with this new throttle body its acting up. when i was transferring the TPS from the factory tb to the BBK one, i recall maybe tweaking it cuz i put it on wrong at first and maybe overspun it. should i buy a new one?
sorry for the late reply...
if you actually did damage the TPS when re-installing it, it'd likely set a CEL.
if your CEL is on and has anything to do with the TPS, then it's more than likely you damaged it.
That's cuz my TPS is usually at 100% 
j/k - but yeah, that could be the cause of the problem. You say you tweaked it: could you explain a little better? Cuz I think you're onto something. 
and my 1st baby on the way... 
