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08-07-2021, 08:44 AM #1
Doesnt decelerate when off the throttle
I have a weird problem. When off the throttle the car goes by itself, it doesnt pick up speed, but will try to stay a constant speed even with my foot completely off the pedal. Once stopped itll slowly drop back down to the correct idle rpm. It does it at all speeds. Weve replaced the tps and iac with no change. Im wondering now if its in the tune. If so, any idea where I should look in tunerpro?
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08-07-2021, 08:53 AM #2Xtreme Member
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- Nov 2008
- Name
- Chris
- Vehicle
- 1994 Trans Am
- Location
- PA, USA
- Posts
- 2,440
Stock throttle body?
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08-07-2021, 09:04 AM #3
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08-07-2021, 11:50 AM #4LTX Member
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- Offline
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- Oct 2014
- Name
- Justin
- Vehicle
- 1995 Formula
- Location
- Houston, TX
- Posts
- 82
Throttle cable. pull it off the tb and see if it move freely
95 Cyber Grey Formula
396 M6
LE 244/252 .636/.636 110
LE 215cc Trickflows
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08-07-2021, 03:44 PM #5Xtreme Member
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- Apr 2012
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- Mike
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- 96 Z28, 95 Roadmaster
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- Conshohocken, PA
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Either the throttle blades are misadjusted, or the TPS is. You need to scan the car though and find out what TPS % the pcm is seeing, that's the only way you'll really know. I'm guessing it's not returning to 0% on coast, so you never hit engine braking.
Sometimes you have to elongate the mounting holes in the TPS to get the voltage low enough, especially on cheap aftermarket sensors.96Z M6, ERE-383 #60, AFR 210s, LE cam, 9", Procharger D1, ???whp
95 Roadmaster T-56 swap, LE1s, baby cam, 4.56s, "The Cammaster"
95 Firehawk hooptie, bolt-ons and suspension
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08-09-2021, 09:51 AM #6
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08-09-2021, 10:09 AM #7LTx Guru
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- Offline
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- Apr 2013
- Name
- Fred
- Vehicle
- 1994 Formula - SOLD
- Location
- Central NJ
- Posts
- 2,283
SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.
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08-10-2021, 06:44 AM #8
I had a ported stock TB that was worn out and the blades would stick open. You should be able to see the witness mark on one edge of the TB bore if it's scraping.
1995 Firebird Formula, M6, ram-air, C7 hubs, BMR/Strano/Founders/Koni suspension, bolt-ons, Recaros, 315 Nankang AR-1's
2010 Corvette Grand Sport, A6, Kooks/Halltech, 418 rwhp
1966 Mustang 289-2V, auto, factory original
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