P0303 Cylinder 3 Misfire

That cylinder misfire will set the code P0303, and possibly other codes caused by the misfire. If your compression test is low, that indicates a piston or valve problem. If your have the 4.7 V8 engine, you may have a valve seat insert coming loose. If you have the 4.0 liter six, the valve or push rod may have jumped off it's rocker. The latter case is not very serious. Have an engine shop take a look.

You need to find out why the cylinder pressure is at 60 psi.A leak down test will tell toy if are the valves or the piston rings.

Did you ever get an answer to this. I have the same problem with my Cylinder 5 .... it's 65psi lower than it should be. The shop wants to charge me $1300 just to take apart and diagnose to see if the warranty company will cover anything.

If you have an engine warranty, contact them to get some assurance your repairs are covered. Some crooked shops lure you into a procedure they know aren't covered. And remember, tearing it down to diagnose it does not fix anything. The 4.7 engine has a high failure rate. The 4.0 six is much more reliable. I wish you the best.

That's the problem, the warranty company will not give any assurance that the repairs are covered until it's diagnosed. Which means taking the engine apart, which means $1300 in diagnosis labor.