High Idle Issues with My 2014 Duramax - Need Help!

Questions and Support
1

I’ve been experiencing some high idle issues with my 2014 Duramax, and I’m hoping to get some insights from others who might have faced similar challenges.

What I’m Facing

Lately, my truck has been idling higher than usual, and I’m not quite sure why. I want to understand:

  • What could be causing this high idle? Are there specific sensors or components that I should check?
  • Is there a way to adjust the high idle settings? I’ve heard that there are some tweaks you can make to optimize performance.
  • Could this affect my truck’s performance or fuel economy? I want to make sure it runs smoothly without unnecessary strain on the engine.

Things I’ve Tried

So far, I’ve:

  • Checked for any error codes using my OBD-II scanner.
  • Inspected the throttle body for any signs of dirt or malfunction.
  • Looked into whether my fuel system is performing correctly.

Questions for the Experts

  1. How have you dealt with high idle issues? Any specific things I should look into?
  2. Are there any recommended modifications or enhancements for improving the idle performance?
  3. Could there be a simple fix, or should I be looking for something more serious?

I’m eager to hear from anyone who has dealt with similar issues. Any tips or guidance would be greatly appreciated!

Thanks in advance for your help!

2

I’ve been having high idle issues too! One thing to check is the throttle position sensor. If it’s failing, it can lead to erratic engine behavior.

7 Likes
3

True! Also, a vacuum leak can cause high idle. Check the hoses around your intake manifold for any cracks.

4

Good point! And make sure your throttle body isn’t dirty. A buildup can throw off idle speed as well.

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5

I read online that cleaning the throttle body can solve these kinds of problems! Anyone tried that yet?

6

Yes! It worked for me. Just make sure you use the right cleaner.

7

This high idle situation can be so annoying! I once thought my truck was possessed with how high it was idling.

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8

Haha, I can relate! You really never know with these vehicles. It’s definitely a mystery sometimes.

9

Could this be related to fuel pressure? If it’s too high, it might also cause the engine to idle higher than normal.

10

That’s a good thought. I hadn’t considered fuel pressure issues, but it definitely makes sense!

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11

Sometimes it can just be software-related. A quick ECU reset might help with idle issues too. Have you tried that yet?

12

I hadn’t thought of that! That could be worth a shot, definitely!

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13

This whole high idle situation feels like a game of whack-a-mole. Fix one issue, and another pops up!

14

So true! It can feel like owning a money pit sometimes.

15

In the end, high idle can stem from various sources—be patient and check everything methodically!

16

High idle issues can be tricky. Start by checking for any diagnostic trouble codes (DTCs) using an OBD-II scanner. This can give you a clue about what’s going on.

17

Great tip! Those codes can point us in the right direction. What specific codes should we look out for?

18

Make sure to inspect the throttle position sensor too. If it’s faulty or misaligned, it can cause high idle. A quick adjustment sometimes solves the issue.

19

That makes sense! I’ve had some issues with that sensor in the past. Is there a way to calibrate it without special tools?

1 Like
20

Don’t forget about the EGR valve! If it’s clogged, it can create issues with the idle. A thorough cleaning can make a significant difference.