rod bearings or knock sensor - 3000GT/Stealth International Message Center
3000GT/Stealth International 3000GT/Stealth International
 

Auto Insurance

» Featured Product
Wheel & Tire Center

Go Back   3000GT/Stealth International Message Center > Modifications and Technical Support > Engine - Turbo

3SI.org is the premier Mitsubishi 3000GT Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 12-09-2010, 11:02 PM   #1 (permalink)
Forum Member
 
Join Date: Aug 2009
Location: texas
Drives: 1993 3000gt vr4
david garza is an unknown quantity at this point
Feedback Score: 0 reviews
Default rod bearings or knock sensor

so i have been having a problem with my 93 3000gt vr4 car would run great till one day car started knocking the sound looked like it came under the intake manifold every time a rev it it will start knocking its not that loud but it knocks i have been searching and they have told me that it may be a bad rod bearing i have also heard that it can also be the knock senosor i dont know if that sensor may cause my engine to also knock i have already taken off my oil pan and have inspected the bearngs i can see the cooper color on them already i dont know if that is normal or if thats the case to what is making my car kock please some one help me out
david garza is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 12-09-2010, 11:47 PM   #2 (permalink)
Drunk as a lord
 
Forest Gump's Avatar
 
Join Date: Nov 2004
Location: Cape Girardeau Mo
Drives: 1995 Stealth TT
Forest Gump Level 2Forest Gump Level 2Forest Gump Level 2Forest Gump Level 2Forest Gump Level 2Forest Gump Level 2
Feedback Score: 102 reviews
Default Re: rod bearings or knock sensor

the knock sensor will not make your car knock.

The copper showing on the bearings at the very least shows they need replacing, but since you were knocking already replacing the bearings probably will not fix the problem. Your crank and rods will need to be reconditioned/resized.
__________________
Pampena 3.5 Stroker, TiAL DR750s, ETS FMIC, FIC 1050s, Walbro 416/485, Chrome ECU, EVO MAF, Dejon intake pipes, Tial QR, DN Precats, Tanabe Medallion Touring, 3sx Single Pass Rad, Samco Hoses, Stoptechs,, Tein S-Techs, Bilstein HDs, Southbend FE Clutch, 300M O/S, Billet T-Case, 5 Speed Trans
Forest Gump is offline   Reply With Quote Quick reply to this message
Old 12-10-2010, 01:26 AM   #3 (permalink)
Forum Member
 
Join Date: Aug 2009
Location: texas
Drives: 1993 3000gt vr4
david garza is an unknown quantity at this point
Feedback Score: 0 reviews
Default Re: rod bearings or knock sensor

i have inspected the crank and everything looks fine is it possible that maybe the bearings are just worn out seens i have 163,000 miles one my car i have been searching around and i belive that knock sensor does knock it has to do with the timing and engine vibration correct me if im wrong are u sure about that can it also be some misfire or something what else cause engine to knock at idle
david garza is offline   Reply With Quote Quick reply to this message
Old 12-10-2010, 06:46 AM   #4 (permalink)
Just play along....
 
speedy25's Avatar
 
Join Date: Dec 2006
Location: NE oHIo
Drives: Various Japanese
speedy25 Level 1speedy25 Level 1speedy25 Level 1
Feedback Score: 7 reviews
Default Re: rod bearings or knock sensor

engine knock at idle= something loose. It might be bearings (did you measure actual clearances?) or something silly like the harmonic balancer coming apart. Keep looking or wait until it goes BANG.

-SP
speedy25 is offline   Reply With Quote Quick reply to this message
Old 12-10-2010, 07:50 AM   #5 (permalink)
Drunk as a lord
 
Forest Gump's Avatar
 
Join Date: Nov 2004
Location: Cape Girardeau Mo
Drives: 1995 Stealth TT
Forest Gump Level 2Forest Gump Level 2Forest Gump Level 2Forest Gump Level 2Forest Gump Level 2Forest Gump Level 2
Feedback Score: 102 reviews
Default Re: rod bearings or knock sensor

the knock sensor is a microphone that communicates noise to the engine computer. It is designed to detect detonation and allow the ecu to reduce ignition timing and enrichen the mixture to reduce the detonation. It doesn't produce any sound on its own and you could remove it completely and the engine won't make noise.

It is possible the bearings are just worn, but usually when they are worn to the point of an audible noise it means that something will be out of round. The noise is the rod colliding at high speed against the crank shaft journals. Usually this will push a rod out of round.
Forest Gump is offline   Reply With Quote Quick reply to this message
Old 12-10-2010, 09:31 AM   #6 (permalink)
Forum Member
 
Join Date: Aug 2009
Location: texas
Drives: 1993 3000gt vr4
david garza is an unknown quantity at this point
Feedback Score: 0 reviews
Default Re: rod bearings or knock sensor

so there would need to be a broken rod bearing in there right i have checked the crank and it looks smooth and free from scratches what would you recomend some mechanic told me it didnt sound like a bearing he says that usually when that happens the sound comes from the bottom of the engine and that the sound can be heard even if you dont rev it in my case it sounds like its comming from the top of my engine and it only sounds when i rev it just a little it sounds like something is lose would you happen to know what size are the rod bearings supposed to be are they suppose to be 0.25mm or what size
david garza is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

  3000GT/Stealth International Message Center > Modifications and Technical Support > Engine - Turbo

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the 3000GT/Stealth International Message Center forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Free email addresses do not work(yahoo, hotmail, gmail,...)
We are currently being blocked by AOL so any AOL based address may not work(aol.com, aim.com, netscape.net, cs.com)
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 05:05 PM.




Garage Plus vBulletin Plugins by Drive Thru Online, Inc.

Search Engine Optimization by vBSEO 3.3.2