I am having a cylinder 1 misfire on my 3.6 l 2014 dodge caravan. So far I have swapped plugs with 1 and 3 and swapped coils with 1 and 5 no change. Next I swapped injectors with 1 and 3 and still showing cylinder 1 misfire. There are no other codes popping up. Any suggestions?

 

Compression check.

 

That was on my list. I have had a suspicion that a valve was sticking open because I held a piece of paper up to the exhaust and it had a sucking action. I put some seafoam in the crankcase yesterday and it smoothed out. I am going to run it like that for a week, change the oil and see if it comes back. Thanks for the quick response...

 

I wanted to update on my progress. I ran a compression test on cyl. 1,3,5 and all 3 cyl came up the same. Just under 150. If a valve was sticking the compression should be lower correct? The misfire comes and goes but it was definitely misfiring when I did the compression test. I know that I am getting fire from the coil to the plug. I was all ready to change the head out but now I'm not so sure. What am I missing?

Just a recap of what I have done:
1. swapped coils with diff cyl
2. swapped plugs with diff. cyl
3. swapped injectors with diff cyl
4. ran a compression test on 1,3,5 all readings the same. (150)
5. I ran sea foam in the crankcase and the misfire immediately went away. After about 300 miles I had the oil changed and it came back in about 2 weeks. Not sure if it was a coincidence or not.
6. Tested for a vacuum leak around the upper intake by spraying carb cleaner around the intake.
7. I did a paper test to the exhaust when it is acting up and it is sucking in. This is one of the main reasons I thought it was a sticking valve, but I should be having a compression issue with that cylinder and I'm not.

 

your doing all the right stuff. if the problem is intermittent...try connecting a vacuum gauge to the manifold...drive it around until you get the conditions that cause the problem. a fuel or electrical misfire from a coil or plug will not show a drop out but a valve problem will.

 

Thanks for the quick response, When you say drop out what does that mean and what am I specifically looking for. I'm not familiar with this process.

 

scroll to the diagram
forums.aaca.org/topic/300620-vacuum-gauge-reading-on-401/

 

everything figured it out?