When i first start my car and its really cold my motor gets a sudden knock,for about 1 second(the first full rotate of the rotating assembly)then it is fine.Is that a sign of a rod bearing getting to the point of failure?I had plans to do acl bearings when i do my oil pan gasket but dang this just did it this morning.After that the car runs perfectly fine,other than a weird idle at some times.

Any ideas on what to do are appreciated.

 

that sounds more like a main bearing. what car/motor do you have?

 

its a d15b

 

you dont have racing mounts do ya? friends car makes a loud knock when he first fires it up,but its 100% from the mounts didnt do it till after we installed his az race mounts. hope its somthing like that.

 

+1 To mounts.

 

wow, if it made noise like that from the mounts, they suck. I've has solid mounts for YEARS with no noise. I haven't meet one person yet with "mount noise"

 

stock mounts and ya it only did it this morning,but i dont want anything happening to my motor so i want to take every pre-caution possible.

 

they suck??? WTF are you smoking...its cause the mounts are so fucking rock hard...lmao