My engine was shaking awful bad the other day and I had a code come up for a misfire. I went ahead and changed out all the spark plugs and cables, however as I pulled all the old ones out they still looked perfectly fine. I started the truck and the code went away, however I could still feel the a cylinder not firing. I figured it was probably the coil, but I changed that out and the problem is still there. In addition, there is a noise coming from one of the cylinders, and phonetically it sounds like a "tss". It happens very quickly, and once every time that the cylinder fires. Could it be something wrong with that cylinder? I wonder because the code is gone, however I can still feel the misfire. Any ideas?

 

Will take a few drive cycles for misfire code to return.

Missing is caused by 3 things
Spark
Fuel
Compression

The noise you hear could be from a broken spark plug arcing.
New just means never tested now a days, so never assume a new part is good until it is proven good.

Or the noise could be from mis-wiring of spark plug wires.
Coil pack:
3 4
2 6
1 5
Front

The 5 6 4 side always gets me, check it twice and then a 3rd time, and make sure #5 goes to #5 cylinder, same for all the other, #1 and #2 as well

To test for fuel issue, unhook the coil, the 4 wire plug
Crank engine a few times
Remove spark plugs, each should have a wet tip if it's fuel injector is working.

Compression, well compression test is the only way.
4.0l SOHC had issues with timing chains, it would often start off as lower power and a misfire, compression test will show if both banks have equal compression, if one back is low then chain on that side has slack or slipped.

 

Hey, sorry it took so long to get back to you. I very much appreciate the advice and the wiring is fine. It is supposed to not be mercilessly dropping snow this weekend so I will see if I can get to it then. Thanks again for the advice, and I will let you know how it goes.