So i turned the car on after it had been sitting outside all day (its cooooooooold btw), and for the first 3-5 seconds I heard some knocking from the engine which soon stopped and didnt reoccur. This is my first real cold start for the year (yes we have 75 degree weather in November here in NC). Any ideas or is this just kinda normal. (New NGK Iridium spark plugs a week ago btw - dont know if that makes any difference) thanks guys.

 

What oil are you using ?? What Weight ?? it was 75 degree weather and you call that cold ??

-matt

 

it might be your timing chain

 

Change your oil and filter - use a Nissan or other good quality filter.
A little bit of noise is ok, don't worry about it.

 

I sympathize with the guy, it was 82 here. But try a new oil filter, it may have leaked the oil back into the pan and so you were running without oil while the pump filled it back up. Fram oil filters are great for leaking out, their internal construction is garbage.

 

well along w/ the spark plugs i changed the oil using synthetic (for the first time) mobil 1 5W-30 and a K&N oil filter.

 

lol, no - just saying that this is my first cold start (it was like 40 outside) bc weve had 75 degree weather up till now.

 

mine knocks on cold start lasts for about a minute or so, maybe until my max warms up. i always use 93. the temps here in MI have been in the 30s

 

Maybe your using a Fram Oil Filter with no anti drain back valve

-matt

 

well i got the K&N one when i changed it a week ago

edit: before that i believe it was some valvoline filter. i dont think ive ever had the fram