Dies at a stop
Thread Starter
2nd Gear
Joined: Jan 2014
Posts: 2
Likes: 0
Dies at a stop
This problem just recently started. When I come to a stop sign or light, the engine idles too slow and dies.(rpm goes below 500) It is difficult to start. But it will start after a couple times if I push down on the accelerator about a quarter of the way. I have had the fuel system cleaned and injectors are all okay. They were replaced a couple of years ago. Any thoughts? Thanks.
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Try cleaning your throttle body and IAC motor with throttle body/carb cleaner. The computer uses the IAC control motor for idle, so when you come to a stop you should be idling off of the computer's command.
If you put it in neutral when you come to a stop, does it idle?
If you hold your foot on the gas when you to a stop with it in neutral, does it still run?
If you put it in neutral when you come to a stop, does it idle?
If you hold your foot on the gas when you to a stop with it in neutral, does it still run?
Race Director
Joined: Feb 2002
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From: Compound in the Grove, Ga.
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St. Jude Donor '16
What year? have you checked fuel pressure? Sometimes the small line on the fuel pump in the tank swells and you lose a lot of fuel pressure.
Last edited by FASTAZU; Jan 6, 2014 at 11:40 PM.
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
Auto or manual? I ask because when shifting a manual if it has a tendency to have a rough shift, i.e. driveline slamming back and forth I would say your IAC is not functioning. It gets input from your computer and the TPS. I would start by checking voltage of the TPS and check the IAC counts. Reset the minimum idle and go from there.
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
Try cleaning your throttle body and IAC motor with throttle body/carb cleaner. The computer uses the IAC control motor for idle, so when you come to a stop you should be idling off of the computer's command.
If you put it in neutral when you come to a stop, does it idle?
If you hold your foot on the gas when you to a stop with it in neutral, does it still run?
If you put it in neutral when you come to a stop, does it idle?
If you hold your foot on the gas when you to a stop with it in neutral, does it still run?
- if you're going to service the TB/IAC valve, remove the complete TB assembly from the engine - break down to the LRU - CLEAN, CLEAN, CLEAN, new gaskets, and re-assemble. cleaning and servicing the TB on the car is a hit-or-miss band-aid!
Thread Starter
2nd Gear
Joined: Jan 2014
Posts: 2
Likes: 0
Try cleaning your throttle body and IAC motor with throttle body/carb cleaner. The computer uses the IAC control motor for idle, so when you come to a stop you should be idling off of the computer's command.
If you put it in neutral when you come to a stop, does it idle?
If you hold your foot on the gas when you to a stop with it in neutral, does it still run?
If you put it in neutral when you come to a stop, does it idle?
If you hold your foot on the gas when you to a stop with it in neutral, does it still run?
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
Okay so it sounds like your car is idling too low. Have you ever messed with the throttle set screw on the throttle body? If you have access to a scan tool, can you tell us how many steps the computer has set for the IAC?
I still recommend cleaning out the throttle body and IAC before going any further. You will see an increase in performance and it also may be the cause of your problem.
I still recommend cleaning out the throttle body and IAC before going any further. You will see an increase in performance and it also may be the cause of your problem.
Burning Brakes
Joined: Mar 2012
Posts: 769
Likes: 22
From: California
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St. Jude Donor'13
My 89' was doing that occasionally and it ended up being the timing was out of whack. It supposed to be set at 6 BTDC and when I checked it, it was at 12 to 14 due to a bad distributor hold down clamp and/or bolt.
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