cylinder 3 misfire, after intake gasket change

Hi everyone,

1st time newbie home mechanic here.

I am currently getting cylinder 3 misfire code, after intake gaskets are installed.

Here's what happened:

installed intake gaskets and reassembled
detected cylinder 1 misfire only
cleaned cylinder 1 spark plug & wire connectors and cleared the code
detected cylinder 5 misfire only
cleaned cylinder 5 spark plug & wire connectors and cleared the code
detected cylinder 3 misfire
checked all of the spark plug wires resistance
found cylinder 2 wire was bad. (over 20k ohms/meter)
replaced all six spark plugs and wires.



Could you take a look the sensor reading and give me some advices? (please refer to the OBD reading attached)


There was a few excellent threads about cylinder 3 misfire issue. I hope mine is not as bad as the other ones...

http://www.automotiveforums.com/t954010-discuss3_4l_cylinder_3_misfire.html

http://60degreev6.com/forum/showthread.php/45899-Misfire-driving-me-nuts
(http://60degreev6.com/forum/showthread.php/45899-Misfire-driving-me-nuts)



Thanks in advance!

Hi everyone,


Just following up, this was due to over torquing the lower intake manifold. The rear side of the intake ports are cracked and letting external air in!!

I did replace it with a used one, along with the head gaskets this time. I still have trouble starting the car. I will post another thread.

Thanks,