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When the engine starts to warm up, it stalls, stops idling?

Tiny
MAHLABARA
  • MEMBER
  • 1997 TOYOTA COROLLA
  • 1.6L
  • 4 CYL
  • 2WD
  • MANUAL
  • 700,000 MILES
The car had no spark and we could not get the ignition module. The car was parked for 4 months, then I bought an aftermarket distributor. Then the car idled fine when cold, but when it starts to be warm it stalls, stops idling. I tested the IAC valve outside the car, and it passed those tests. Tested while on connected on the car but not connected on the throttle body, i.E. Closed the bypass hole and closed the other whole with a finger. I watched the IAC closing slowly as the engine warmed up, because I was controlling the air with my hand. It continued idling higher as the finger cannot control the pressure the engine is pulling the air. I also tested the MAP sensor, it is fine. I also tested the TPS, it is fine. There are no vacuum leaks. What could be the problem here? The car only drives when you adjust the idling higher through the throttle stop screw.
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Saturday, August 5th, 2023 AT 5:29 AM

17 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
It sounds like the EGR valve is stuck open, here is a guide to help as well and the EGR valve so you can check it out:

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

and

https://youtu.be/DqUCbbKdWf4

I would remove the vacuum line from the EGR first. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

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Saturday, August 5th, 2023 AT 11:43 AM
Tiny
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My car does not have an EGR valve. The car stalls while idling as it begins to warm up or hot and also when you change gears that is when you press the clutch.
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Saturday, August 5th, 2023 AT 1:58 PM
Tiny
KEN L
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Was it removed? Let's check for vacuum leaks, use this guide when the engine is cold only:

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

Please go over this guide and get back to us.
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Monday, August 7th, 2023 AT 9:53 AM
Tiny
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Thanks for the response. I will follow the guide this coming Saturday. During week I am working.
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Monday, August 7th, 2023 AT 12:13 PM
Tiny
KEN L
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  • 47,536 POSTS
Sounds good, please let me know. Have a good week.
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Tuesday, August 8th, 2023 AT 10:14 AM
Tiny
MAHLABARA
  • MEMBER
  • 13 POSTS
  • 1997 TOYOTA COROLLA
  • 1.6L
  • 4 CYL
  • 2WD
  • MANUAL
  • 600,000 MILES
1997 Toyota corolla160i 4a-fe stalls when it starts to warm-up, it does not idle when warm, only if I adjust idle higher around 2000rpm. The car does not have EGR. Idle Control Valve(ICV) works fine bench tested and on the car, MAP sensor works fine tested in car, TPS works fine bench tested and in car. It started after fitting new after sales Distributor because the pick up coils of original distributor were dead. Also for the car to start I have to press the accelerator pedal flat down.
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Wednesday, May 1st, 2024 AT 9:00 AM (Merged)
Tiny
KEN L
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I would service the throttle actuator also the IAC valve can still be bad, did you replace it?

Please go over this guide:

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

And please go over this video:

https://youtu.be/XMB16Gg-qNg?si=pnUx_gpUSgm9Zb_g

Here is how to do the throttle bore service in your car. I assume you did the vacuum leak check? Check out the images (below). Please upload a video in your response of any problems so we can see what to help you with.

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Wednesday, May 1st, 2024 AT 9:06 AM
Tiny
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Thank you for the response. I have cleaned the throttle body the IAC valve. Also, the PCV valve is fine. The only thing I did not test is the coolant sensor.
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Wednesday, May 1st, 2024 AT 1:49 PM
Tiny
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Checked vacuum using carb cleaner and find none. Video of testing ICV.
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Wednesday, May 1st, 2024 AT 1:59 PM
Tiny
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I've tested. The other videos are longer. Cannot upload them.
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Wednesday, May 1st, 2024 AT 2:06 PM
Tiny
KEN L
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In the video I can't see the valve move, can you please re-shoot it? Also, you might just need to replace it. Can you please go over the stalls at idle guide?

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

Let me know.
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Thursday, May 2nd, 2024 AT 12:45 PM
Tiny
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ICV test for closing.
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Thursday, May 2nd, 2024 AT 9:20 PM
Tiny
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Test ICV valve opening.
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Thursday, May 2nd, 2024 AT 9:23 PM
Tiny
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Controlling ICV with my hand.
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Thursday, May 2nd, 2024 AT 9:40 PM
Tiny
MAHLABARA
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Adjust ICV using bi-metallic spring. The next thing to test is the Coolant temperature sensor.I have checked air leaks using carb cleaner and no air leaks.I have not checked the TPS IDL signal.
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Thursday, May 2nd, 2024 AT 9:51 PM
Tiny
KEN L
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You can hear a vacuum leak when the engine is running so this will be the problem, the IAC control motor seems to be working okay. Thanks for the videos. You may have an intake manifold leak, here is a guide to help us find it, please use when the engine is cold only:

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

Please go over this guide and get back to us.

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Friday, May 3rd, 2024 AT 12:16 PM

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