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After the car is warmed up starts missing then stalls

Tiny
DJKLEIN
  • MEMBER
  • 16 POSTS
Good eve,

The alternator is at 14.10 volts running. When it starts to stall it goes down to 13.04 after the stumble happens. Not before. Good.
2.51 short-term fuel trims # 1 upstream. Short-term fuel trims negative 51 downstream.
Thank you, David
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Friday, June 17th, 2022 AT 1:54 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
Hi,

The negative 51 indicates the computer is trying to lean the fuel mixture. On your scanner, does that indicate -51%?

Let me know.

Joe
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Friday, June 17th, 2022 AT 7:23 PM
Tiny
DJKLEIN
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Hi,
Yes, it does, very weird huh.
Thank you, David
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Sunday, June 19th, 2022 AT 5:20 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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David, if the fuel pressure was consistent, you likely have a leaking fuel injector. When you checked the fuel pressure, how quickly did the pressure drop off when you turned the key off?

Let me know,

Joe
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Sunday, June 19th, 2022 AT 7:26 PM
Tiny
DJKLEIN
  • MEMBER
  • 16 POSTS
Hi Joe,

The pressure dropped off slowly when I turned the key off. I replaced all four injectors and still had the same problem. Maybe computer or wiring?
Thank you, David
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Sunday, June 26th, 2022 AT 12:50 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

If everything checks out good, it has to be a wiring issue or PCM. Check the wiring at the coils, PCM, and anything that could affect the engine. With metal connectors, heat causes them to expand. Maybe you are losing a good connection. However, I would think that would set a code.

When the engine is warm, start wiggling wires around the PCM, coils, and injectors and see if anything changes. Also, I know the crank sensor is new but double-check that connection.

Let me know.

Joe
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Sunday, June 26th, 2022 AT 9:15 PM

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