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Discussing knocking in the 99-04 Forum. started my car a couple days ago and there is a knock. it only knocks ...

       

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Old April 22nd, 2008, 08:48 PM   #1
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knocking


started my car a couple days ago and there is a knock. it only knocks when the engine is cold. help me out?
 

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Old April 22nd, 2008, 08:50 PM   #2
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maybe a bearing???? , check your oil level
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Old April 22nd, 2008, 09:35 PM   #3
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could be dry starts
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Old April 23rd, 2008, 12:07 PM   #4
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Is it a knock, or piston rattle? Check out my link on detonation.
Detonation Explained
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Old April 23rd, 2008, 12:25 PM   #5
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Originally Posted by Trick Tuners View Post
Is it a knock, or piston rattle? Check out my link on detonation.
Detonation Explained
wouldnt his car be throwing a code from the knock sensors if it was knocking?
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Old April 23rd, 2008, 02:17 PM   #6
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it is my understand that our cars do not have knock sensors
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Old April 23rd, 2008, 02:43 PM   #7
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They don't....so no...it wouldnt unfortunately...
 
Old April 23rd, 2008, 03:07 PM   #8
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Originally Posted by 00silvergt View Post
it is my understand that our cars do not have knock sensors
interesting.... learn something new everyday
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Old April 23rd, 2008, 04:17 PM   #9
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mine does it when its cold too. pretty sure its a rod bearing
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Old April 23rd, 2008, 06:53 PM   #10
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mine does it too for about 5 seconds after its been sitting for over a day or so.
 
Old April 23rd, 2008, 08:50 PM   #11
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I Have the same problem for some time now and it has gotten worse over time i have read some articals about bearing life and how oil escaping the bearings and pump during time that the engine is off sounds like worn out bearings to me
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Old April 23rd, 2008, 09:27 PM   #12
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Doubt its rod bearings.....mine still does that on cold startups and its got new bearings in it.
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Old April 23rd, 2008, 10:23 PM   #13
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i thought it was my bearings also but didnt know for sure just wanted to get some input. thanks.
 
Old April 24th, 2008, 11:32 AM   #14
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Originally Posted by 2kGT View Post
Doubt its rod bearings.....mine still does that on cold startups and its got new bearings in it.
sorry but that is not normal,, well depends on how long it takes for pressure to pump up but it should be near intsant
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Old April 24th, 2008, 05:09 PM   #15
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after sitting for a few days, it could be rockers or just dry parts in the top end...that is much more common with a pushrod motor but still possible with us. and i agree that oil psi should be up almost instant
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Old April 24th, 2008, 08:12 PM   #16
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what wieght oil do you run?
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Old April 25th, 2008, 10:39 AM   #17
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i run 5-20w moble synthetic
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Old April 25th, 2008, 12:17 PM   #18
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Originally Posted by superbeef1000 View Post
sorry but that is not normal,, well depends on how long it takes for pressure to pump up but it should be near intsant

didnt say it was normal cheif....just that I doubt he has a bad rod bearing.
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Old April 25th, 2008, 01:15 PM   #19
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I thnk my car might be having some sort of detonation problem- when I have the rpms low (around a grand) and get on it in fifth, it starts sounding like that- like a diesel, and ugly as hell. I'm due for an oil change, so it might be something in the valvetrain- I'm gonna keep an eye on this thread.
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Old April 25th, 2008, 01:19 PM   #20
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Originally Posted by suprajay79 View Post
I thnk my car might be having some sort of detonation problem- when I have the rpms low (around a grand) and get on it in fifth, it starts sounding like that- like a diesel, and ugly as hell. I'm due for an oil change, so it might be something in the valvetrain- I'm gonna keep an eye on this thread.
You should use the LW to back out 2-4* timing in the low load region. NEVER let it detonate!!!!! Also lugging 5th at such low rpms is not a good thing to do. Just downshift.
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