The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners

  • Join the Community!

    DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. Chat with others, create a build thread, post questions and answers. Get involved! Logging in will also remove many of the advertisements, along with this notice. ;)

Please Support STM Tuned
Please Support VR-Speed Factory

over tightening knock sensor

MyBeatGSX

Proven Member
1,335
26
Jul 17, 2005
Southington, Connecticut
Quick question, no guesses please. I over tightened my knock sensor when installing it awhile ago, I wasn't aware that it shouldn't be too tight. Now the question is, can I take it off and just put it back on to the correct torque or is it perminately broken? Does overtightening really cause false knock readings?
 

andymoraitis

Awaiting Email Verification
3,242
143
Jan 25, 2004
Utica, Michigan
Yes it'll cause false knock readings and yes you can remove it and re-install it to the correct torque. The knock sensor is nothing more than an electronic microphone. If it's in too tight, it'll pick up a level of excess noise in direct proportion to how much it was overtightened.
 

steve-o_95_GST

Supporting Member
663
15
Feb 29, 2004
Ft Lauderdale, Florida
how do you properly torque a knock sensor with the cord in the way? Does an o2 sensor socket fit over it? I think mine may be over tightened so I want to correct it.

-Steve
 

MyBeatGSX

Proven Member
1,335
26
Jul 17, 2005
Southington, Connecticut
Yea that's a good point. There isn't a socket on earth that is that big and has the notch in it. I just used a huge adjustable wrench and cranked the crap out of it. Let's hope this is what's causing all my knock on the logs.

So it just hand tight and then a little turn, just like a spark plug right?
 

andymoraitis

Awaiting Email Verification
3,242
143
Jan 25, 2004
Utica, Michigan
It's supposed to be around 17 lb/ft. About the same as a cam cap if you want reference.
 

MyBeatGSX

Proven Member
1,335
26
Jul 17, 2005
Southington, Connecticut
I have a small 3/8 drive 500 in/lb torque wrench, its less than a foot long, that should fit in there without too much issue.

Hmm, 17 ft/lb = 204 in/lb... I think that's even less than the spark plugs.... yes that's right, I torque my spark plugs, I am that anal.
 

95GSXracer

DSM Wiseman
1,431
183
Jul 25, 2002
LaRue, Ohio
I don't see how a torque wrench can be considered accurate when used with a crows foot wrench, you change all of the geometries. I'm no dentist though.
 

idt512

Proven Member
232
8
May 4, 2003
Hemet, California
95GSXracer said:
I don't see how a torque wrench can be considered accurate when used with a crows foot wrench, you change all of the geometries. I'm no dentist though.


only altering 1 dimension, so subtract an inch for the crowfoot...it would translate to be 188.36 in/lbs or 15.69 ft/lbs:D
 

RavenX

Proven Member
659
5
Sep 23, 2002
Daytona Beach, Florida
We took the correct size socket and made our own slit just like the O2 sensor. We were out of one socket put who cares it slips in easy enough with the torque wrench:)
 

MyBeatGSX

Proven Member
1,335
26
Jul 17, 2005
Southington, Connecticut
24mm is NOT the correct size for a 2G sensor. Be careful what you say unless you're 100% sure because I just wasted $5 on a useless crow foot.:mad: :notgood:

The correct size is more like 1". I used an adjustable wrench and got it back there pretty easily. Obviously I couldn't use a torque wrench, so I tried the torque wrench on another bolt to feel out 17 ft/lb and then tried to retighten the knock sensor the same.

I made 2 logs and they're much better and much more consistant. I'll post them up in my other topic later today.
 

NHerron

Proven Member
2,780
54
Nov 5, 2011
Missoula, Montana
16ft lbs for a 2g turbo. 420a is 7ft lbs. From my 1997 factory service manual. I'll buy a 27mm socket to modify.

Also, the socket size is 27mm for a 2G turbo confirmed just today on a new sensor. The sensor PN for a 2g turbo is MD300670. 1G turbo is MD141510.

27mm or 1-1/16". The latter being called a sender socket (for oil pressure sender sensor) which is much easier to find than a 27mm 3/8 drive.

The attached image is from my 97 service manual.
 

Attachments

  • 20170711_211746.jpg
    20170711_211746.jpg
    325.4 KB · Views: 112
Last edited:

NHerron

Proven Member
2,780
54
Nov 5, 2011
Missoula, Montana
Edit my previous reply-

1-1/16" is actually a bit smaller than 27mm. The 1-1/16" oil sender socket I had wasn't quite big enough so I honed it out a bit bigger to fit.
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com OHM Racing Raven Fabrication RixRacing RockAuto RTM Racing SouthBay Fuel Injectors STM Tuned VR Speed Factory

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Top