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Misfires and codes P0300, P0171 and P0128

Tiny
JC-842
  • MEMBER
  • 2007 DODGE CALIBER
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Starting car today it made a popping noise. On second attempt it started but runs rough and makes a hissing noise like air is escaping from somewhere. There's two lightning bolts flashing from my dash and the car seems to be in limp mode. Recently replaced coils and all fuel injectors. Because I was getting a number one cylinder misfire. It's showing 3 codes after this episode today. P0300,
P0171, and P0128. The last code refers to a thermostat issue.
Which I removed 6 months ago.
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Friday, July 23rd, 2021 AT 11:11 AM

18 Replies

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

First, if you removed the thermostat and drove for 6 months, there is a very good chance you have damaged the motor. The thermostat must be there for circulation to work correctly. Without it in the motor, only a portion of the block is getting the correct cooling.

This system has 2 thermostats and they both must be there and functioning.

https://www.2carpros.com/articles/how-an-engine-thermostat-works

I would start with a compression test to see if the motor has any internal issues. Pay attention to the number one cylinder.

https://www.2carpros.com/articles/how-to-test-engine-compression

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

The 171 is part of the misfire issue. Once that is repaired, that code will go away.

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers
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Friday, July 23rd, 2021 AT 11:34 AM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Last year I completely disassembled the thermostat housing and only found one thermostat. So I'm not sure about that but your the professional so if you say so. But what would any of that have to do with a cylinder misfire? And what's the compression ratio per cylinder so I can check it?
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Friday, July 23rd, 2021 AT 12:06 PM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Last year I completely disassembled the thermostat housing and only found one thermostat. So I'm not sure about that but your the professional so if you say so. But what would any of that have to do with a cylinder misfire? And what's the compression ratio per cylinder so I can check it?
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Friday, July 23rd, 2021 AT 12:06 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
If the block gets too hot it can cause cylinder damage.

Compression should be 140-160 in each cylinder. You can rent a tester at a parts store.

Roy
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Friday, July 23rd, 2021 AT 12:10 PM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
I already have one. All cylinders are fine with no leak down apparently. I will take the thermostat housing back off and replace both therms. If I can find the other one. Where is the second located? In the link it appears to be around power steering pump I think.
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Friday, July 23rd, 2021 AT 2:28 PM
Tiny
ASEMASTER6371
  • MECHANIC
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What was the compression?

I would change the plugs while you have them out.

https://www.2carpros.com/articles/how-to-change-spark-plugs

I attached the location in a previous post.

Roy
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Friday, July 23rd, 2021 AT 3:43 PM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Thank you. I did not see a second thermostat. But you should know so I'll figure it out. Do you know anything about the intake runner and if it gets stuck could it cause it to sound like air being expelled and loss of power?
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Friday, July 23rd, 2021 AT 3:49 PM
Tiny
ASEMASTER6371
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No, it will not. I can only address one issue at a time. If you have questions about the runner, please start a new question.

Roy
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Friday, July 23rd, 2021 AT 3:51 PM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
The compression was just a little under 150 on all cylinders Roy.
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Friday, July 23rd, 2021 AT 3:52 PM
Tiny
ASEMASTER6371
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Good. That makes me feel better. I always want to know the results.

Roy
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Friday, July 23rd, 2021 AT 4:01 PM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Why does it keep going into limp mode? And what do the two lightning bolts that are displaying represent? I'm going to look at the manual it should have some answers. Bottom line this happened upon starting the car this morning. It ran fine the day before. The popping noise whatever that was is behind the problem. I got to figure out where the air like noise is coming from.
And I think that will tell me what's up. I'm thinking the intake is maybe bad the air runner manifold or whatever it's called.
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Friday, July 23rd, 2021 AT 5:42 PM
Tiny
ASEMASTER6371
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Can you check for any codes? The lightning bolts should have set a code.

Roy
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Friday, July 23rd, 2021 AT 5:44 PM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
I will check tomorrow. The only codes I saw were the 3 I sent earlier today.
But I have not checked yet. I'll plug the diagnostic reader and let you know then. Thanks for your help I really appreciate it. Can't afford $100.00 hour to let someone else figure it out.
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Friday, July 23rd, 2021 AT 5:52 PM
Tiny
ASEMASTER6371
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You are welcome.

I look forward to your codes.

Roy
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Friday, July 23rd, 2021 AT 6:06 PM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
You are never not going to believe this Roy but I got 15 codes this morning. I installed the battery and hooked up my tool and I was shocked at what I saw. This has got to be a glitch. Do you want all the codes? I think the problem is in my throttle body. And that code did not show up.
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Saturday, July 24th, 2021 AT 11:58 AM
Tiny
ASEMASTER6371
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Yes, please list the codes for me.

Roy
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Saturday, July 24th, 2021 AT 12:20 PM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
P2004/U0101/ po123/ PO 463/UO141/PO113/P2017/PO480/ PO481/P2311/UO402/PO203/PO202/PO201/U110C
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Saturday, July 24th, 2021 AT 12:37 PM
Tiny
ASEMASTER6371
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Okay, the key here is the 200 codes for the injectors. Once they are repaired, the other codes most likely will go inactive for the engine controls.

I attached the flow chart for the injectors. Follow the chart and keep me updated on the results.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Roy
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Monday, July 26th, 2021 AT 2:35 AM

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