Engine not running correctly when warm

Tiny
ERIC ALRIDGE
  • MEMBER
  • 2003 CADILLAC CTS
  • 3.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
Why does my engine starts bulking after it gets warm?
Monday, February 10th, 2020 AT 6:54 PM

9 Replies

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

I would first replace the plugs as it could be that easy.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

Beyond that, it could be low fuel pressure.

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

Do you have any codes stored in the system? P0300 is common for this and I attached the flow chart for it.

Roy
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Tuesday, February 11th, 2020 AT 7:01 AM
Tiny
ERIC ALRIDGE
  • MEMBER
  • 26 POSTS
Will bad spark plugs make your car get no power at all when you press the gas pedal?
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Tuesday, February 11th, 2020 AT 7:10 AM
Tiny
ASEMASTER6371
  • MECHANIC
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No, it would not. Bad plugs would cause it to stutter but not prevent acceleration.

Low fuel pressure would cause this.

Are there any codes stored?

Roy
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Tuesday, February 11th, 2020 AT 7:14 AM
Tiny
ERIC ALRIDGE
  • MEMBER
  • 26 POSTS
P1779, P1780, P1795, P2176, P0122, P0222, P0056, P0161, P0700, P1779. Those are the codes I got.
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Tuesday, February 11th, 2020 AT 12:58 PM
Tiny
ERIC ALRIDGE
  • MEMBER
  • 26 POSTS
Those are the codes I got.
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Tuesday, February 11th, 2020 AT 4:11 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay.

1779 is a serial data line failure. The transmission cannot communicate with the rest of the modules.

1780 is a code again for communication for shift feel.

1795. This could be set from a dirty throttle body. Clean the throttle body.

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

2176. Related to the throttle body cleaning.

122. This is for the TPS on the throttle body and related to the cleaning as well.

161and 56. This is for heated O2 sensors.

700. This is a general code for the transmission. The beginning codes are the codes needed to be checked.

Roy

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Tuesday, February 11th, 2020 AT 4:11 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, they are.

You are going to need some help on this one.

You need a shop that can check these for you to see why these codes are set.

Roy
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Tuesday, February 11th, 2020 AT 4:15 PM
Tiny
ERIC ALRIDGE
  • MEMBER
  • 26 POSTS
Okay, thanks.
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Tuesday, February 11th, 2020 AT 8:57 PM
Tiny
ASEMASTER6371
  • MECHANIC
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You are welcome.

Always glad to help.

Roy
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Tuesday, February 11th, 2020 AT 9:00 PM

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