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Misfires

Tiny
JC-842
  • MEMBER
  • 2007 DODGE CALIBER
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
Removed plugs two are black and two are no carbon and wet? Ignore the image I tried to load a picture of the spark plugs but they didn't upload.
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Sunday, August 8th, 2021 AT 10:28 AM

46 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Was two of them wet with oil or fuel?
Also what codes are you getting ?

https://youtu.be/vMwTzURWXmk

https://www.2carpros.com/articles/how-to-change-spark-plugs
https://www.2carpros.com/articles/how-to-test-an-ignition-system

Please let me know little more info.

Thanks.
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Monday, August 9th, 2021 AT 2:27 PM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Fuel no oil. Cylinders 3/4 not firing. Cylinder 1/2 fouled out black with smut.
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Monday, August 9th, 2021 AT 9:59 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The first thing I would do is a compression test to be sure the engine internals are good. You should have 140-160 pounds in each cylinder.

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

Then I would check the fuel pressure as that is a common cause for the engine misfire codes.

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

Are there any codes that are set?

Roy

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Thursday, August 12th, 2021 AT 3:04 AM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Okay, thanks. The compression test is done already 150 per cylinder.
Fuel pressure has not been checked. Can you provide a guide for checking the fuel pressure I'm not sure where to hook the gauges. And do you know where the fuel pressure regulator is located? Thanks, JC
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Thursday, August 12th, 2021 AT 4:39 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You will need to T into the line at the fuel rail. I attached a picture for you to view. You can rent a tester kit at a parts store for this procedure.

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

The regulator is part of the fuel pump assembly. It must be replaced with a pump.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy
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Thursday, August 12th, 2021 AT 4:53 AM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
There were no codes for fuel just the P2311 code for coil4. This number 4 cylinder misfire has been ongoing for a long time. But the car has always ran fine just hard on gas. Last week when I started it. It made a popping noise thru the throttle body and a sound like air leak. I replaced intake manifold and throttle body. But the motor shakes and won't accelerate at all. I have a cheap diagnostics OBD11 scanner.
Yesterday I did get a code I could not identify I think something to do with the transmission 7E9:A/T /7E8 Engine.
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Thursday, August 12th, 2021 AT 5:06 AM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Replaced with pump? Not sure what that means. Can you elaborate a little more on that please?
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Thursday, August 12th, 2021 AT 5:12 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, I would remove the valve cover and inspect it under the cover. If it is backfiring, you have had a rocker arm issue. The fact that it backfires indicates that.

https://www.2carpros.com/articles/replace-valve-cover-gasket

Roy
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Thursday, August 12th, 2021 AT 5:13 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The fuel pump contains the fuel pressure regulator. The part is not available by itself. You replace the entire fuel pump.

Roy
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Thursday, August 12th, 2021 AT 5:14 AM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Oh no, you mean inside the gas tank. No way I'm not going there. I'm not a certified mechanic. I'm 70 years old I can't deal with that job. I'll have to let the dealership scan it I guess. This is a guessing game at this point and is getting more expensive by the day.
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Thursday, August 12th, 2021 AT 5:17 AM
Tiny
JC-842
  • MEMBER
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Okay, thanks.
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Thursday, August 12th, 2021 AT 5:19 AM
Tiny
ASEMASTER6371
  • MECHANIC
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You are welcome.

Let us know if you have any other questions.

Roy
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Thursday, August 12th, 2021 AT 5:20 AM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
What exactly am I looking for inside the valve cover?
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Thursday, August 12th, 2021 AT 5:21 AM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Roy, what does the backfire indicate? This is my problem I've thought that all along. Do I need a valve job or what?
Thanks, JC
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Thursday, August 12th, 2021 AT 5:26 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are looking for anything broken. The backfiring indicates something in the valve train.

It usually shows up with a compression test.

Roy
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Thursday, August 12th, 2021 AT 5:28 AM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Okay, I'll do another compression test and then pull the cover. I know where I can buy a motor for $350.00 complete.
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Thursday, August 12th, 2021 AT 5:32 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, keep me updated.

Roy
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Thursday, August 12th, 2021 AT 5:52 AM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
Will do. I think I'm heading in the right direction now. $250.00 later. I should have figured out the missing and the air sound not to mention the backfire.
But the compression test was good. That I don't understand. If something is collapsed. Oh well, at least it's never full around here. Thank you again I'll be in touch when I find out something. JC
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Thursday, August 12th, 2021 AT 5:56 AM
Tiny
ASEMASTER6371
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You are welcome.

Roy
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Thursday, August 12th, 2021 AT 5:59 AM
Tiny
JC-842
  • MEMBER
  • 181 POSTS
I see nothing unusual Roy. Help
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Thursday, August 12th, 2021 AT 7:25 AM

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