⟐ Answer deleted September 15, 2018 at 21:16 MST

Oldturkey03 is wrong

I could not find the camshaft position sensor on my 2012 Kia Forte Ex and there is nothing online. But I found it finally. Here is the camshaft position sensor. And this car only has one. Again this is for a 2012 Kia Forte Ex. You have to remove the plastic piece from the top of the engine and the tube going to the air filter to gain access to the camshaft position sensor. I am pointing to exact part on the engine. You have to remove the plug and then wiggle your way to take off the screw, pull it, and replace with the new one. I used a 10mm socket. I hope this helps someone else cause there is NOTHING online for this exact car….until now

⟐ Commented March 14, 2025 at 4:27 MST

⟐ Answer edited March 06, 2024 at 15:20 MST

The first thing done was changing the spark plugs as a gamble. No fix, of course. Cylinders 3 and 4 also had a lot of oil on the spark plugs... More on that in the compression test numbers.

The first thing I checked for was codes about the problem. Regrettably, I forgot the code, but I saw a generic Cylinder 1 misfire code. To rule that out, I swapped coils, cleared the codes, and re-scanned. It's the same code on the same cylinder. I'm not too surprised being it uses Denso ignition coils.

The next thing I checked was the compression. This is where I begin to be leary of the engine. The other thing I noticed (but can't show, my borescope camera doesn't support image saves but cylinders 1, 3, and 4 have oil from bad rings; 3 and 4 being the worst, and also have the worst compression numbers.

• Cylinder 1 (left): 1,350KPa
• Cylinder 2: 1,325
  • So far so good. Kia/Hyundai says there should be a 100KPa differential on this engine at most. A little deviation will happen with this many miles on anything, so nothing concerning.
• Cylinder 3: 1,250-1,350KPa
  • 100KPa differential, ick. It wouldn't be worrisome if isolated and it's fine, just a death sentence with Hyundai/Kia when it's worse.
• Cylinder 4: 1,100-1,300KPa, 1,200KPa on the 2nd test
  • 100-200KPa differential. Not great.

Cylinder 4 is all over the place. Cylinder 3 is borderline at best.

The only thing I have not checked is the ethanol and fuel injectors, yet. That's next.

In the meantime, I'm weary of the engine and based on those numbers and I do suspect the engine is potentially NFG given the inconsistencies with Cylinder 4 and Cylinder 3 being borderline. I've even tested Cylinder 4 4 times, the others were baseline run and checked a 2nd time. The only test I didn't check is the wet compression. I saw everything I had to see.

Update on the checks: Checked the gas, 10% ethanol. It's gotta go back under the microscope.

Swapped injector 1 to 2. Code moved.

And I'm back with yet another report. Sigh...

So I swapped the injector, and it had the same codes.

I swapped the replacement injector into Cylinder 3 (and put the good one in Cylinder 2), same codes

The only things I can see to try are the connector and if that doesn't work it looks like a PCM/ECU or engine failure.

⟐ Commented April 03, 2024 at 18:24 MST

⟐ Commented June 16, 2025 at 14:07 MST

⟐ Answer accepted March 08, 2024 at 10:58 MST

⟐ Answer accepted March 08, 2024 at 8:26 MST

⟐ Answer accepted March 08, 2024 at 8:25 MST

⟐ Answer edited September 17, 2022 at 2:55 MST

https://youtu.be/KME-VRXgvu4

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