Truck runs terrible when it is warm

Tiny
LEONARD AKERMAN
  • MEMBER
  • 2001 CHEVROLET SILVERADO
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 237,712 MILES
My truck seems to run terrible but runs better when it's cold. Acts like it's not getting gas. Had the fuel line pressure they told me it was good. Changed fuel filter and spark plugs. 2 o2 sensors and Mass air flow sensor and EGR valve.
Tuesday, November 5th, 2019 AT 8:20 AM

13 Replies

Tiny
LEONARD AKERMAN
  • MEMBER
  • 10 POSTS
Just as a update: I also had my exhaust system check and they said it was good also.
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Tuesday, November 5th, 2019 AT 12:42 PM
Tiny
LEONARD AKERMAN
  • MEMBER
  • 10 POSTS
I'm just curious what you think it could be? If I could I would pick it up and throw it as far as could.
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Tuesday, November 5th, 2019 AT 6:56 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi:

Has anyone checked the engine coolant temperature sensor (ECT)? This sensor tells the computer how rich or lean to make the fuel mixture based on temperature.

Using a live data scanner, see what the ECT indicates and if it seem correct.

I attached a picture of sensor location. Check to make sure there are no issues with the connector or wiring.

Let me know what you find.

Joe
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Tuesday, November 5th, 2019 AT 7:16 PM
Tiny
LEONARD AKERMAN
  • MEMBER
  • 10 POSTS
Yes, I told that it was bad and they also said that it would not cause my problem.
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Tuesday, November 5th, 2019 AT 7:23 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi:

You didn't mention the ECT. I rechecked. And, yes it can cause this problem. Reconfirm that it was replaced.
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Tuesday, November 5th, 2019 AT 8:57 PM
Tiny
LEONARD AKERMAN
  • MEMBER
  • 10 POSTS
No, I have not replaced it yet. Probably try it tomorrow.
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Tuesday, November 5th, 2019 AT 9:29 PM
Tiny
LEONARD AKERMAN
  • MEMBER
  • 10 POSTS
Thank you.
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Tuesday, November 5th, 2019 AT 9:31 PM
Tiny
LEONARD AKERMAN
  • MEMBER
  • 10 POSTS
I also have another problem with the same truck this problem. I was told about before I bought the truck about three years ago. Every so often my brake light and and light comes on the first problem that I told you about just started Wednesday night.
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Tuesday, November 5th, 2019 AT 10:13 PM
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Hello, I am the site's editor. I was reading through your question and I noticed you are asking about two different issues. In order for the site to properly index/categorize questions they need to about one issue. Please post a new question for the brake light issue.

For your convenience here is the link:
https://www.2carpros.com/questions/new
Make sure you are logged into the site before clicking on the link.

Thank you and have a great rest of your day!
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Wednesday, November 6th, 2019 AT 2:47 PM
Tiny
LEONARD AKERMAN
  • MEMBER
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Okay, thank you.
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Wednesday, November 6th, 2019 AT 2:49 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
I would recommend using a live data scanner to determine if the ECT is sending the information correctly. I don't want you to purchase a part for no reason.

Let me know if it helps with the driveability issues.

Joe
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Wednesday, November 6th, 2019 AT 6:56 PM
Tiny
LEONARD AKERMAN
  • MEMBER
  • 10 POSTS
I want to thank you all for your help. Just put engine coolant temperature sensor on my truck and it's a lot better.
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Thursday, November 7th, 2019 AT 3:26 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Wonderful. I'm glad to hear it helped. Let us know if we can help in the future.

Take care.

Joe
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Thursday, November 7th, 2019 AT 8:11 PM

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