Car shuts off when braking and stopping
Thread Starter
Registered User
Joined: Sep 2005
Posts: 2,271
From: Bahrain
Car shuts off when braking and stopping
Every time I come to a stop the car shuts off. Just driving for 3 minutes Ill hold the brakes to stop and the idle rpm's drop really low and shuts off. What could be causing this?
Registered User
Joined: Jun 2002
Posts: 109
From: West Plains, MO
Re: Car shuts off when braking and stopping
check your VSS (vehicle speed sensor)
if the computer see's no vehicle speed it thinks it is ideling.
when you are on the decel, throttle closed, it will run the IAC all way closed trying to bring the engine rpm down, but it can't because you are on decel.
On LT1 swaps I have done without an VSS hooked up I had that exact problem, and have watched it do it on datalogs.
By the time you slow down enough that the rpm goes to desired idle, the IAC can't pick up fast enough.
try coming to a stop with one foot on the gas holding the throttle slightly open. It will probaby stay running fine.
Could try your cruise..my bet is it won't work, because your vss is bad. or a wiring problem
good luck
if the computer see's no vehicle speed it thinks it is ideling.
when you are on the decel, throttle closed, it will run the IAC all way closed trying to bring the engine rpm down, but it can't because you are on decel.
On LT1 swaps I have done without an VSS hooked up I had that exact problem, and have watched it do it on datalogs.
By the time you slow down enough that the rpm goes to desired idle, the IAC can't pick up fast enough.
try coming to a stop with one foot on the gas holding the throttle slightly open. It will probaby stay running fine.
Could try your cruise..my bet is it won't work, because your vss is bad. or a wiring problem
good luck
Thread Starter
Registered User
Joined: Sep 2005
Posts: 2,271
From: Bahrain
Re: Car shuts off when braking and stopping
check your VSS (vehicle speed sensor)
if the computer see's no vehicle speed it thinks it is ideling.
when you are on the decel, throttle closed, it will run the IAC all way closed trying to bring the engine rpm down, but it can't because you are on decel.
On LT1 swaps I have done without an VSS hooked up I had that exact problem, and have watched it do it on datalogs.
By the time you slow down enough that the rpm goes to desired idle, the IAC can't pick up fast enough.
try coming to a stop with one foot on the gas holding the throttle slightly open. It will probaby stay running fine.
Could try your cruise..my bet is it won't work, because your vss is bad. or a wiring problem
good luck
if the computer see's no vehicle speed it thinks it is ideling.
when you are on the decel, throttle closed, it will run the IAC all way closed trying to bring the engine rpm down, but it can't because you are on decel.
On LT1 swaps I have done without an VSS hooked up I had that exact problem, and have watched it do it on datalogs.
By the time you slow down enough that the rpm goes to desired idle, the IAC can't pick up fast enough.
try coming to a stop with one foot on the gas holding the throttle slightly open. It will probaby stay running fine.
Could try your cruise..my bet is it won't work, because your vss is bad. or a wiring problem
good luck
Thread Starter
Registered User
Joined: Sep 2005
Posts: 2,271
From: Bahrain
Re: Car shuts off when braking and stopping
Finally got the Datamaster to work. IAC count had to stay maxxed out to drive it. It surged and sputtered at part throttle, it jump in and out of closed and open loops, BPW mS reading was in the yellow, and I had DTC 15 cool temp low. Anyone here good at reading this? I'm about to throw it into VEMaster.
Registered User
Joined: Dec 1969
Posts: 4,950
From: San Diego, CA
Re: Car shuts off when braking and stopping
Your coolant temp low code is the reason you're jumping in and out of closed loop. You may have a bad temp sensor (the one in the waterpump) or a bad wire or connector to the temp sensor.
Thread Starter
Registered User
Joined: Sep 2005
Posts: 2,271
From: Bahrain
Re: Car shuts off when braking and stopping
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Registered User
Joined: Feb 2004
Posts: 174
From: London, England
Re: Car shuts off when braking and stopping
Just a thought, but I think a bad EGR valve can cause a car to shut off when coming to a stop. I had this happen to me on my old TBI camaro, Something else to check I guess.
Thread Starter
Registered User
Joined: Sep 2005
Posts: 2,271
From: Bahrain
Registered User
Joined: Jul 2002
Posts: 1,367
From: Burlington, NJ
Re: Car shuts off when braking and stopping
i had a vacuum problem with my auto.....one of the vacuum lines was cracked and when i replaced it my TC decided to unlock when i took my foot off the gas. when i would come to a halt or even at idle the car would sputter and sometimes die if i didnt hit the gas a little. no more