need help im going crazy. 3.0L Flex rough idle.

[jaksun]

Guys this is my first time posting on here but i need your help. Im going crazy trying to figure out whats going wrong. My truck has a periodic rough idle and misfire. Giving me the codes P0301, P0401, P1171. ive replaced the cylinder heads, PCV valve, Dpfe sensor, dpfe hoses, coil pack, spark plugs, spark wires, egr solenoid, and vacuume tested the egr valve it holds pressure fine, did a top end cleaning, and injector cleaning, did a compression test it failed because the air would escape out of the other spark plug holes, and did a cylinder leakdown test and the rings are good. If any one can help me with this i would greatly appreciate it.

 

[Big Jim M]

did a compression test it failed because the air would escape out of the other spark plug holes.
WHAT! You are waaay wrong on that. Tell us what the compression was (is)!
Yeah the other holes are making sounds but that sound is from each of their cylinders, not the one you are testing at the time.
Big Jim

 

[jaksun]

It would not hold any compression untill i pluged the other spark plug holes. Thats what made me think the exhaust valve was not seating properly so i did a top end cleaning and injector cleaning. But it made no differance. Still the same codes.

 

[Big Jim M]

check again

It would not hold any compression untill i pluged the other spark plug holes. Thats what made me think the exhaust valve was not seating properly so i did a top end cleaning and injector cleaning. But it made no differance. Still the same codes.

Do a compression test on all cylinders and write down what is in each and get back to us.
Take all plugs out and install the tester gauge in one cylinder and spin the engine till the pressure stops rising. Then go t the next and do them all. You will most likely find out what is wrong with the engine missing right there.
Big Jim