Knock on startup?
#1
Knock on startup?
When I start my car, I sometimes get a small knock. It'll sound like..
Crank crank knock VROOOOOOOM idle idle idle
The engine runs like butter though. No stumble, no misses right through the power band and nothing else to complain about. I only get this knock on startup, and even then it's only sometimes. Any ideas?
PS no codes.
Crank crank knock VROOOOOOOM idle idle idle
The engine runs like butter though. No stumble, no misses right through the power band and nothing else to complain about. I only get this knock on startup, and even then it's only sometimes. Any ideas?
PS no codes.
#2
<font face="Verdana, Arial" size="2">Originally posted by Lions3:
When I start my car, I sometimes get a small knock. It'll sound like..
Crank crank knock VROOOOOOOM idle idle idle
The engine runs like butter though. No stumble, no misses right through the power band and nothing else to complain about. I only get this knock on startup, and even then it's only sometimes. Any ideas?
PS no codes.</font>
When I start my car, I sometimes get a small knock. It'll sound like..
Crank crank knock VROOOOOOOM idle idle idle
The engine runs like butter though. No stumble, no misses right through the power band and nothing else to complain about. I only get this knock on startup, and even then it's only sometimes. Any ideas?
PS no codes.</font>
How many miles are on your engine?
What type of oil and filter are you using?
TTT for you.
-Mike
#4
<font face="Verdana, Arial" size="2">Originally posted by moparman:
I've heard Fram oil filters can cause this.</font>
I've heard Fram oil filters can cause this.</font>
Sounds like it may be starter/flywheel related... if the pop or knock is just when cranking, not running.
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#7
It has been noted on this board that Fram filters can cause a knock at start up. If you have a Fram oil filter, try changing to better filter. Just do a search for oil filters and you'll find out more than you want to know.
#9
I searched in the archives and came across this old thread, but my 94LT1 does the same with 135k and an AC oil filter. Small knock only on startup, I can hear it sometimes when I shut it off.
Let's hear some more idea's....
Let's hear some more idea's....
#12
Originally posted by 3.1firebird
yea this thread was pretty much a buried and decaying corse
I guess I will quit worrying about it. If it breaks one day it breaks.
yea this thread was pretty much a buried and decaying corse
I guess I will quit worrying about it. If it breaks one day it breaks.
#13
Originally posted by chasmanz28
i get the knock to but only in the cold months and how can the oil filter cause that knock even though i use gm filters
i get the knock to but only in the cold months and how can the oil filter cause that knock even though i use gm filters
Last edited by chasmanz28; 04-07-2003 at 12:26 AM.
#14
Originally posted by chasmanz28
any ideas
any ideas
#15
Makes sense, but the engine build pressure while it's cranking. And any shop that does an oil change should be switched on enough to fill the filter up as well.
To me, it sounds like it knocks when it first makes ignition. So it isn't when the flywheel is first engage by the starter, and it isn't once it has hit idle.
It only makes a knocking sound when it's burning up all the accumulated fuel.
Doesn't seem to be hurting anything, or get worse, but it's sorta annoying.
To me, it sounds like it knocks when it first makes ignition. So it isn't when the flywheel is first engage by the starter, and it isn't once it has hit idle.
It only makes a knocking sound when it's burning up all the accumulated fuel.
Doesn't seem to be hurting anything, or get worse, but it's sorta annoying.