C5 does not slow down
Thread Starter
Racer
Joined: Jun 2005
Posts: 286
Likes: 2
From: 99702 Malae Place Aiea Hawai’i
C5 does not slow down
when I am on a flat surface and get up to posted speed and take my foot of the gas pedal my
car does not slow down? Why is this. Should the car not slowly come to a stop. Thx
car does not slow down? Why is this. Should the car not slowly come to a stop. Thx
Team Owner
Joined: May 2001
Posts: 87,375
Likes: 1,593
From: Western NY
Eventually it will, at least to the point of the engine slowing down to idle speed, and if the car is in gear, a low enough gear, the car will then chug along at whatever car speed equates to a 7-800 RPM engine speed.
Race Director
Joined: Apr 2017
Posts: 10,247
Likes: 888
From: Hickory NC
2025 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
2020 C5 of the Year Finalist - Modified
St. Jude Donor '17 thru '26
I had a problem like this recently. I had pulled my ported throttle body off to do a little clean up and put an old throttle body on. Apparently something had "gunked up" around the butterfly keeping it from always closing when my foot came off the gas pedal. I used a little brake fluid as a cleaner and then air to blow everything out. It's worked good since then.
Thread Starter
Racer
Joined: Jun 2005
Posts: 286
Likes: 2
From: 99702 Malae Place Aiea Hawai’i
Thanks no codes. This is a automatic drive. We have some flat long stretches of road and when I get yo around 40 mph ant take my foot of the she will just keep going. I will investigate the throttle body butterfly. Sounds like my first stop.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,626
Likes: 4,071
From: Cape Coral, Florida
Just use some good TB cleaner !!
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
As about if your TB is sticking, clean it with a cleaner and a good rag. If you car is "coasting too long" I'm not sure you have a problem? Your car sounds balanced, the bearings are lubed, adjusted correctly and leaving your engine in gear will naturally provide forward motion even at low RPMs.
If you feel that the car is not slowing down fast enough, apply your brakes.
Last edited by billschroeder5842; Sep 3, 2018 at 11:14 AM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Safety Car
Joined: Mar 2015
Posts: 3,638
Likes: 245
Drifting
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
Team Owner
Joined: May 2001
Posts: 87,375
Likes: 1,593
From: Western NY
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Your Throttle Blade cant be stuck because that would set a DTC or put you into reduced engine power due to the difference between what the Accelerator Position sensor and the TPS voltages would be. Its a fail safe circuit and will not allow a mismatch between the two.
I wont say that the Throttle blade wont be dirty but its most likely isn't staying open.
IMHO, If the engine revs when you put it in neutral, you would have a stuck accelerator position sensor. If it doesn't rev, your are just coasting
Thread Starter
Racer
Joined: Jun 2005
Posts: 286
Likes: 2
From: 99702 Malae Place Aiea Hawai’i
100% on the mark!
Your Throttle Blade cant be stuck because that would set a DTC or put you into reduced engine power due to the difference between what the Accelerator Position sensor and the TPS voltages would be. Its a fail safe circuit and will not allow a mismatch between the two.
I wont say that the Throttle blade wont be dirty but its most likely isn't staying open.
IMHO, If the engine revs when you put it in neutral, you would have a stuck accelerator position sensor. If it doesn't rev, your are just coasting
Your Throttle Blade cant be stuck because that would set a DTC or put you into reduced engine power due to the difference between what the Accelerator Position sensor and the TPS voltages would be. Its a fail safe circuit and will not allow a mismatch between the two.
I wont say that the Throttle blade wont be dirty but its most likely isn't staying open.
IMHO, If the engine revs when you put it in neutral, you would have a stuck accelerator position sensor. If it doesn't rev, your are just coasting
