sometimes it can be a very minor one... check if all the coils are clean and clear, and pushed in all the way.. is it a specific one?? example.. if your code is p0301 (cylinder 1 misfire).. Switch the coil with cylinder three and see if the code changes to p0303.. If so the coil is bad, if not check the correct installation of the spark plug, and coil connector. Good luck

 

Thanx, will do.

* I think is P0305 or P0306. The one I mixed the harness up and later fixed.

 

facing the car. where is cylinder 4 located?

 

I believe it's the middle cylinder on the driver's side.


5v6
3v4
1v2

 

hey, i just changed my spark plugs today and used the Denso Iridium spark plugs...everything went well and didnt take that long at all but when i started my car up it sounded much much throatier, (like a mini muslce car haha)...found out that a hose wasnt connected. So after fixing that started it back up and my engine light came on and it sounded like it wanted to die on me at idle and while i drove it around a little. Anybody have any advice at all?? Oh and now my driver side catylitic converter gets super hot and glows a bright orange...

 

when u did ur install of the new plugs u didnt connect something right or swapped the wires wrong and drove the car around while it was mis-firing (throaty sound lulz) and melted the cat shut....now u need a new cat and u need to fix ur mistake on the plug install

good luck ...

 

this morning and no its not mis-firing the engine would be making a complete different noise, the plugs are working fine and i pulled out of my drive way got to the end of my court and turned around and pulled back into my drive way cause i was worried something worse might happen..i made sure all the wires were connected to the right places...but i do think i need a new cat now cause its never done that before until now

 

Pulled the last plug on the driver side and there are some oil build up....

 

get used to it..very common..no worries..wipe it up and throw a new plug in..

 

Has anyone else had trouble with the socket hitting a lip in the cylinder? I have an HR if that matters. I have tried both 5/8 & 16mm

 

Cool thread. So did I miss what the gap needs to be? I just picked up a set of NGK plugs.

 

buy the correct plugs for the z and dont touch them..i never messed with my gap and far as i know an iridium plug is not supposed to be re-gapped..

 

I did this back in January and determined at that time that I need to replace the valve cover due to oil in spark plugs. About to install the new covers with the new O Rings. Do I need to replace the plugs again? I'm sure oil have gotten in the new plugs.

 

So, got my plugs in tonight. Car fired right up. Looks and sounds good, however the check engine light is on. Going to test drive it tomorrow. If the light is still on tomorrow, going to pull the batt for a half hour and see if it resets.

 

^ Above problems solved. A successful replugging. The SES gave me a 0102 MAF error code in diagnostic mode. MAF: Mass Air Flow sensor. Most likely occured when I test fired the car before putting everything back together. Reset the SES, all is well. Now, time to put my cover back on.

 

Don't need to gap the laser plugs pre-gapped
6240 stock number right?

 

Yep. Coorect. Thanks.

 

I have a 2005 350z automatic with intake and exhaust what kind of sparkplugs would you recomend?

 

Stock range would be fine

 

Easily the best description on this I have seen. Have to swap mine out soon but I'm still not looking forward to it. I'm tempted to pay someone to do it just to keep Murphy from ****ing with me again.