Engine stalls when warm

Tiny
MRT1963
  • MEMBER
  • 2012 FORD F-250
  • 6.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 107,000 MILES
My truck stalls after sitting overnight. Once it hits 165 degrees the idle becomes erratic and will stall. I can restart it and it will stall in a few minutes this will continue until 170 degrees and then run fine all day. I can let it sit for 5 hours and it is still fine. No codes at all I changed the canister purge valve and PCV, but still the same.
Wednesday, April 15th, 2020 AT 10:25 AM

38 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

There is a coolant sensor that sends the information to the ECM for fuel mapping. If it is not sending the correct signal, the ECM will send a fuel map that cause it to stall.

https://www.2carpros.com/articles/engine-stalls

I would also check the fuel pressure to be sure there is sufficient fuel to the injectors.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy
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Wednesday, April 15th, 2020 AT 11:07 AM
Tiny
MRT1963
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This truck starts and idles fine until 165 temperature. Once warm it's is good for the day. No problems. Once warm the truck runs fine all day. If it was low fuel pressure it would stall all the time. It also does not have a coolant temp sensor
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Wednesday, April 15th, 2020 AT 11:20 AM
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
Also check the mass airflow sensor for contaminants, I've had several come in on the hook like this and had a bug stuck to the mass airflow sensor. Also bad intake gaskets can do that, just pour a little water over the intake and listen for the slurping sound, this only works when the leak is huge though.
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Wednesday, April 15th, 2020 AT 3:35 PM
Tiny
MRT1963
  • MEMBER
  • 28 POSTS
I have cleaned the throttle body and MAF. No change. No intake leak. It runs fine until 165 degrees. Temperature sensor seems okay, it showed 46 today and 51 on the dash. Once the truck has worked it runs fine and will not stall again. Vapor purge valve doesn't seem to open until it is warmed up and only shows 48 percent.
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Friday, April 17th, 2020 AT 1:32 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,520 POSTS
Hello,

I agree with ASEMASTER6371. This sounds like the engine coolant temperature sensor needs to be replaced. What happens is when it gets warm it can short out/false readings. Lets put it on a scanner to confirm the readings. This guide will help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Here is the coolant sensor location so you can check it out. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

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Monday, April 20th, 2020 AT 10:28 AM
Tiny
MRT1963
  • MEMBER
  • 28 POSTS
That is for a diesel. I have a 6.2 has engine.
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Monday, April 20th, 2020 AT 10:57 AM
Tiny
MRT1963
  • MEMBER
  • 28 POSTS
After my engine is warm it runs fine all day. I can go back out and drive it 5 hours later and no problems. It happens after it sits over night.
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Monday, April 20th, 2020 AT 11:00 AM
Tiny
MRT1963
  • MEMBER
  • 28 POSTS
Yes, it looks normal. When it shows 165 it stalls 170 it's fine. Canister purge is not opening until 170 and inky 48 percent.
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Monday, April 20th, 2020 AT 11:28 AM
Tiny
ASEMASTER6371
  • MECHANIC
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What is normal?

When it hits the temperature, does it drop out and come back?

Roy
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Monday, April 20th, 2020 AT 11:46 AM
Tiny
MRT1963
  • MEMBER
  • 28 POSTS
When it hits 165 the idle will jump up and down and stall. It will restart and do the same thing. Sometimes it will do it a third time then be fine.
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Monday, April 20th, 2020 AT 12:12 PM
Tiny
MRT1963
  • MEMBER
  • 28 POSTS
I'll have to recheck tomorrow. It's warmed up now. I don't know if it shows voltage just temperature. It's crazy I am going to change all the o2 sensors and MAF this week. Okay, today I ran it and it stalled at 165. I started it again and the idle was jerky and idled really rough. It stalled again. Restarted again but smooth and stalled. Fourth start it stayed running like nothing was wrong. This time I got a pending code p0365. No check engine light. This time I saw purge valve opening earlier then I have seen before.
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Monday, April 20th, 2020 AT 1:36 PM
Tiny
ASEMASTER6371
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Okay, keep me updated.

I am looking for something specific that relates to voltage and fuel mapping causing your issue. Okay, I doubt that will have any effect on it. That is why I want to see readings when it drops out. Okay, disconnect the purge valve to see if it stops.

I still need all the data that I requested.

Roy
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Monday, April 20th, 2020 AT 1:45 PM
Tiny
MRT1963
  • MEMBER
  • 28 POSTS
It runs fine now. I did not see a voltage area on my scanner. On the last restart it ran fine like nothing is wrong. I did a frame recording of it running what do you need for me to send you? Thanks
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Tuesday, April 21st, 2020 AT 10:35 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,520 POSTS
P0365 Camshaft Position Sensor B Circuit Bank 1 - This may cause the issue. Have you replaced the coolant sensor? Here is the camshaft sensor location so you can check it out and replace it if needed. Check out the diagrams (below). Please let us know what you find.
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Tuesday, April 21st, 2020 AT 10:39 AM
Tiny
MRT1963
  • MEMBER
  • 28 POSTS
I don't believe I have a coolant sensor. I have a cht sensor under the intake. I just realized there were 4 pending codes a p0369, p0390 and a p0394.
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Tuesday, April 21st, 2020 AT 10:44 AM
Tiny
MRT1963
  • MEMBER
  • 28 POSTS
Neither of the pictures you sent me are my engine.
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Tuesday, April 21st, 2020 AT 10:46 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, I attached the coolant sensor locations for you. There are 2 on your engine. I attached locations of both.

I need the information from the scan tool when the issue happens, not when it is running good.'

The 369 is for the cam sensor circuit malfunction.

The 390 is for the other cam sensor.

The 394 is another cam circuit code.

These are circuit codes and the wiring and voltages need to be checked to the sensors.

Roy
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Tuesday, April 21st, 2020 AT 11:13 AM
Tiny
MRT1963
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That is not my engine. I have a 6.2. I just restarted it all codes are gone. I did notice something with my o2 sensor voltage I will send a video. Ma voltage is jumping from low to really high.
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Tuesday, April 21st, 2020 AT 11:18 AM
Tiny
ASEMASTER6371
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All that information is for the 6.2 engine.

Give me your complete VIN number.

Roy
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Tuesday, April 21st, 2020 AT 11:21 AM
Tiny
MRT1963
  • MEMBER
  • 28 POSTS
The engine in the pic doesn't look like it. VIN: 1ft7w2b62ceb19234
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Tuesday, April 21st, 2020 AT 11:32 AM

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