SPONSORED LINKS

Misfire

Tiny
DIVIDES
  • MEMBER
  • 2013 HYUNDAI SANTA FE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 174,000 MILES
Bought it with a misfire. First it was on all of them plus a p0106 for map. Cleared all codes only one left was cylinder 3. Had an extra coil, replaced it, went away. After 30 miles and 2 on/off cycles it came back as a pending code. Do these have common issues with injectors? 2.4l.
SPONSORED LINKS
Tuesday, November 23rd, 2021 AT 3:28 PM

33 Replies

Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
Saw this, is this possible? Meaning firing order of 1, 3, 4, 2 and so it could be cylinder number 4 that is bad?
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Tuesday, November 23rd, 2021 AT 3:53 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

Interesting one. I ran through the manuals and found nothing as far as firing order or cylinder identification. I would have thought, like you, this is crazy. LOL

So, after finding nothing, I went to the powertrain management schematics. Believe it or not, the ignition coils are at different locations based on if the vehicle has a smart key or not. Ugh! I can't believe it either.

I attached what I found in the schematic. In theory, cylinders 1-4 are as we know them to be. However, the coil can be located in different cylinders. (I don't even know if that makes sense to me) LOL

Take a look at the schematic and let me know your thoughts. Also, I went with a 2.4L 4 cylinder. There is a 2.0 turbo. If I got the wrong one, let me know.

Take care,

Joe
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, November 23rd, 2021 AT 8:50 PM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
So, my misfire on 3 would be ignition coil 2 counting from left. With a smart immobilizer they mean a fob I am guessing.
Was this
answer
helpful?
Yes
No
Wednesday, November 24th, 2021 AT 5:24 AM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
I switched coils between 2nd and 3rd but it's still there. The fact that all were misfiring and that MAP p106 was there before I am sure means something. None pop up when check engine light come on now but maybe it takes a while for them to do.
Was this
answer
helpful?
Yes
No
Wednesday, November 24th, 2021 AT 7:28 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

Yes, to your question about the FOB. If the misfire didn't move, it could be a few things such as lower compression in that cylinder, a faulty fuel injector, or an issue with the MAP.

The intake air temperature sensor is part of the MAP. If you have a live data scan tool, see if the reading from it seems possible. Also, let me know what the short-term fuel trims are.

One other thought. Disconnect the MAP and see what happens. It should go into a pre-programmed setting to allow it to run. It should also stop a misfire if the sensor is the cause.

Let me know what you find.

Joe
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, November 24th, 2021 AT 9:29 PM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
Disconnected the MAP and it was worse.
Was this
answer
helpful?
Yes
No
Thursday, November 25th, 2021 AT 7:31 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Okay, are you able to get the short-term fuel trims? Also, did you take notice of the IAT signal?

Let me know.

Joe
Was this
answer
helpful?
Yes
No
Thursday, November 25th, 2021 AT 6:19 PM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
I will get fuel trims. What you mean by take notice? You mean get the value from scanner?
Was this
answer
helpful?
Yes
No
Thursday, November 25th, 2021 AT 8:23 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

Let's see what the trims are. As far as the IAT, you are exactly correct, the values. Let me know what you find.

Take care and enjoy the last little bit of Thanksgiving left. LOL

Joe
Was this
answer
helpful?
Yes
No
Thursday, November 25th, 2021 AT 8:34 PM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
Here are some data. Also if the car is running and I pull each coil's harness the motor changes, all of them work, so this is weird.
Video (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Friday, November 26th, 2021 AT 11:24 AM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
Also, when the ignition is on, one of the wires is ground and the other shows nothing, I checked more than one harness and they were the same, once I start the car that ground becomes battery power on both harnesses I checked.
Was this
answer
helpful?
Yes
No
Friday, November 26th, 2021 AT 11:31 AM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
If you delete code and rev up the motor it feels good that's why I think it's just strange. Like no misfire at all once code is deleted and until it comes back on again.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, November 26th, 2021 AT 11:51 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
How long does it take for the code to return? Also, I wasn't able to see results on the scanner, just the headings.

Let me know.

Joe
Was this
answer
helpful?
Yes
No
Friday, November 26th, 2021 AT 8:56 PM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
Sometimes fee miles before the check engine light is back. I just rewatched the video clip, you couldn't see the values?
Was this
answer
helpful?
Yes
No
Friday, November 26th, 2021 AT 9:11 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

I attached a pic of what I'm seeing. Take a look.

Joe
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Friday, November 26th, 2021 AT 10:17 PM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
Strange, I sent a full view video.
Was this
answer
helpful?
Yes
No
Saturday, November 27th, 2021 AT 6:45 AM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
Took pictures and videos of all data, some may not apply.
Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Was this
answer
helpful?
Yes
No
Saturday, November 27th, 2021 AT 2:45 PM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
More.
Images & Video (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Was this
answer
helpful?
Yes
No
Saturday, November 27th, 2021 AT 2:54 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

I got it that time. LOL Interestingly, other than 300 misfires on the affected cylinder, I don't see anything that sends up a red flag.

By chance, have you checked engine compression? We may have a weak cylinder. If you look at the pic below, I feel the other things would cause more than a single cylinder to misfire. At this point, I would check compression. Here is a link that shows in general how it's done:

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

Starting with pic 2, I provided the diagnostics specific to a cylinder 3 misfire. One of the tests is compression. The manufacturer's specs are in the test. I know some of these things you have already done. Also, one test includes the use of an oscilloscope. I'm hoping your scanner can do it.

Let me know your thoughts or if I can help in any way.

Joe

See pics below.

Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Was this
answer
helpful?
Yes
No
Saturday, November 27th, 2021 AT 10:06 PM
Tiny
DIVIDES
  • MEMBER
  • 898 POSTS
Have not checked compression as if it was low I would think the misfire would be there all the time and not sometimes and wouldn't stop if I delete the code. But I will measure it. My scanner may have oscilloscope, I don't know if I will be able to measure it based on the description, I will try.
Was this
answer
helpful?
Yes
No
Sunday, November 28th, 2021 AT 8:57 AM

Please login or register to post a reply.

Related Engine Misfire Content

Intermittent Misfire
VIDEO
Intermittent Misfire
Instructional repair video
Misfire Random Code P0300
GUIDE
Misfire Random Code P0300
The world of automotive diagnostics can be complex, with numerous codes and potential issues to keep track of. One of the more common engine diagnostic codes is P0300, which...
VIEW MORE

Sponsored links