after sittting for 4 days in the garage in freezing weather the engine had a knock on start-up. Has anyone encountered this problem

 

I had that this morning as well, not sure what it is though

 

Does the engine knock after reaching operating temperature?

 

Your rods have gone bad most likely

 

nope

 

probably you put in sh!tty gas.

 

Was pretty low so may be the gas. I only run 93 octane, but may have gotten a batch of crap. It's only 2.40/gal here

 

It's probably because the car was sitting for a few days. Probably not a problem...possibly due to the oil in the system draining into the pan and when it was started four days later the parts weren't as coated with oil as normal thus causing the engine to knock a little. As long as the engine does not knock under normal engine operation or when the motor is warm you should be fine.

 

Thanks good to know

 

+1 in very cold temperatures this can happen for a second or two. Use your block heater if you have one.

 

I'm not sure what it is but mine does it too. When it's really cold it's a bit loud on startup, but it's brief and goes away quickly... I wouldn't worry about it. My engine has been running strong for almost 2 years now, and it's always done that when it's super cold out. A few weeks ago it got down to 5 degrees... Just make sure you warm your engine up slowly and you are golden.

 

What exactly do you mean by Knock? My car makes a stuttering/ thudding sound when I take off in first and also at hwy speed when I give it some gas

 

Stop complaining! You're getting the most BANG for your buck!

 

Dont worry. your engine is dry as a bone. thats all. if it keeps knocking, then you have a problem. Every single chevy engine knocks on startup even in the summertime and that is considered acceptable.

 

hey you just proved the theory of gravity!!!!!!!!

hahahah jk. the oil is draining out of the top of the motor and to the pan. any car will do this. drive as normal. if you watch the oil pressure gauge and it never moves, AND you have a knocking sound.......you have problems.

 

Mine has done it lately when it's been really cold. Just due to the oil draining out of the engine during the night, and the oil pump initially not being able to pump oil instantaneously to the engine for that slight second.