Engine not idling and stalling?

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
This sounds like the IAC valve is not working or needs to be cleaned here is a guide to help you get the problem fixed.

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

and check this guide as well

https://www.2carpros.com/articles/engine-stalls-idles-too-high-low-after-dead-or-replaced-battery

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:38 PM (Merged)
Tiny
BOOMER73
  • MEMBER
  • 4 POSTS
I had to replace the my IAC to fix the problem cost me $45.00 from Rock auto
Was this
answer
helpful?
Yes
No
-1
Wednesday, June 9th, 2021 AT 12:38 PM (Merged)
Tiny
JOZZY
  • MEMBER
  • 1 POST
  • 1999 DODGE RAM
My truck will start and then stall on some days and other days it will stay running just changed the idle control censer and the problem is still there looking for some help
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:38 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 34,330 POSTS
If the battery was recently disconnected or run dead, the engine computer must relearn minimum throttle before it will know when it must be in charge of idle speed. To meet the conditions that will cause this to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals.

Caradiodoc
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:38 PM (Merged)
Tiny
BSODERSTROM
  • MEMBER
  • 1 POST
  • 1998 DODGE RAM
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 137,654 MILES
My truck is doing a number on me where I can start it but it will not idle. If I keep gas into it it runs strong. I had a guy tell me the fuel filter was in the tank, and it needed changed, then another guy told me I need a co2 sensor or a catalactic converter. I have no engine codes im not over heating I have no noises, my exhaust has a leak in front of the converter. Help
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:38 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Chances are they are both wrong. If it runs good other than the at idle, the idle air control valve may be bad or you may have a vacuum leak. Because there is no check engine light makes it a guessing game. Start with the easy things first. Look for vacuum leaks and let me know what you find.

Joe

PS: A bad fuel filter would cause more problems under a load not an idle when the least of fuel is needed. As far as the O2 sensor, it could cause a problem. However, if the O2 sensor is the problem, it may be a result of the exhaust leak.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:39 PM (Merged)
Tiny
BLBOONE
  • MEMBER
  • 1 POST
  • 1998 DODGE RAM
  • 2WD
  • MANUAL
  • 185,000 MILES
I have a 1998 dodge ram 3500. When you start the truck in after it has set for a couple of hours the truck lopes for 5-10 min then dies. You have to keep starting the truck 10-20 times to befor it will not lope after you start it.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:39 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You may have a bad IAC ( idle air control) but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:39 PM (Merged)
Tiny
WIL ZILEN
  • MEMBER
  • 3 POSTS
  • 1997 DODGE RAM
  • 250,000 MILES
What would cause it to shut off at an idle or running down the road it gives no codes replaced all sensors complete tune up new pcm new ignition switch?
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:39 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 34,330 POSTS
What is involved in restarting the engine after it stalls? Do you have to wait a half hour for it to cool down? Will it always restart right away or do you have time to check for spark? Have you checked for loss of fuel pressure? That is not monitored by the Engine Computer and will not set a diagnostic fault code. This sounds like you have a vacuum leak, dirty throttle bore or the IAC motor is not working but to be sure lets check out these guides to help us fix it.

https://www.2carpros.com/articles/stall-at-idle

and

https://www.2carpros.com/articles/throttle-actuator-service

and

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please run down these guides and report back.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:39 PM (Merged)
Tiny
WIL ZILEN
  • MEMBER
  • 3 POSTS
Today it stalled sprayed starting fluid down the intake and it made no differance
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:39 PM (Merged)
Tiny
WIL ZILEN
  • MEMBER
  • 3 POSTS
I replaced the idle air control motor again it worked all fixed thank you.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:39 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 34,330 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:39 PM (Merged)
Tiny
ANDYSDODGE
  • MEMBER
  • 4 POSTS
  • 1997 DODGE RAM
  • V8
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
It starts fine but when gets to normal operating temp RPMs drop and I have to keep pressing on the accelerator to keep it idleing. I have replaced the fuel filter, fuel pump, throttle position sensor. Im at my wits end. Can you help? Thanks in advance.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:39 PM (Merged)
Tiny
ANDYSDODGE
  • MEMBER
  • 4 POSTS
Think I might have fixed my problem. After reading all the info here I replaced the idle air controller and PCV valve. Problem seems to be fixed. We will see.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:39 PM (Merged)
Tiny
GIANTKILLER
  • MEMBER
  • 2 POSTS
  • 1996 DODGE RAM
  • 5.2L
  • V8
  • 2WD
  • AUTOMATIC
  • 282,000 MILES
It will start but does not idle when brought to an idle. Will not idle at all. Tried warming up but still no idle.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:40 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 34,330 POSTS
Are you saying the idle speed is too low and you have to hold your foot on the accelerator pedal to keep the engine running? If that is the case, this is a real common problem caused by disconnecting the battery or running it dead. The Engine Computer lost everything in memory. Most of that will be relearned on its own except for "minimum throttle", which takes a very specific set of conditions to relearn. To meet those conditions, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals. Until that is done, the computer won't know when it must be in control of idle speed.

This guide can help

https://www.2carpros.com/articles/stall-at-idle

Please run down this guide and report back.
Was this
answer
helpful?
Yes
No
-1
Wednesday, June 9th, 2021 AT 12:40 PM (Merged)
Tiny
GIANTKILLER
  • MEMBER
  • 2 POSTS
I found the igniter wire comming out of the fuse block to the starter had come apart. Simple splice fixed it.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:40 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Good to hear, please use 2CarPros anytime we are here to help.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:40 PM (Merged)
Tiny
JOVANG
  • MEMBER
  • 1 POST
  • 1996 DODGE RAM
  • 3.9L
  • V6
  • 2WD
  • AUTOMATIC
  • 43,000 MILES
I purchase the truck from a University that was used to help students move. I purchased it after it has been sitting for five to six years. It fired up like a champ and drove strong however after it ran for a little bit it started stalling when it came to the idle position and would not start back up immediately (sometime it did most of the time it did not). I replaced the ignition switch and ignition coil it started up and ran all day like a champ. Problem came back after I put some fresh gas in it this time it would not start till the next day. I got it to start and dove it to the shop. I siphoned all the old gas that was sitting for those years (it was light brownish like malt liquor). After I siphoned it out I replace the fuel pump. It would crank but not fire back up. I replaced the distributor cap, rotor, and spark plugs. Would not fire back up. Note: before I purchased it I was told the camshaft sensor and O2 sensor had been replaced.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2021 AT 12:40 PM (Merged)

Please login or register to post a reply.

Related Engine Stall At Idle Content

Engine Stalls After Dead or New Battery
GUIDE
Engine Stalls After Dead or New Battery
So you installed a new battery and now the engine stalls? You have done nothing wrong because believe it or not this is normal. The engine computer has a learning cycle...
VIEW MORE