Have you replaced your knock sensor? - Insight Central: Honda Insight Forum
 
Go Back   Insight Central: Honda Insight Forum > 1st Generation Honda Insight Forum > MPG Issues

Insightcentral.net is the premier Honda Insight Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 01-23-2011, 05:39 PM   #1 (permalink)
Junior Member
 
Join Date: Mar 2009
Posts: 15
Default Have you replaced your knock sensor?

So a while ago i cleaned my egr passages and did a bunch of maintenance on my insight. While putting everything together i noticed something. My knock sensor was broken. The sensor housing had a split in the plastic and could be divided in two pieces. The plug still attached. I put the two pieces back together and had no codes. The best mileage i could get on my drives was in the 52 mpg range all sub 45mph. It didnt throw a code for the knock sensor mind you. So i just got around to ordering a new one. Installed it and am already noticing a couple of interesting changes. After the idle learn procedure just before the fan came on the engine suddenly got a lot quieter. I'm pretty sure it was because the ecu was adjusting the timing based on knock readings and had finally gotten it right. Now even at idle the car is quieter. It has more power across the power band. The most interesting thing is that now my car seems to use less assist in situations where it used to use more and now i regularly see my mpg gauge go into the 125mpg range and have no trouble maintaining speed while in that range. I find it particularly interesting because there was no real warning that the sensor was bad. If i had not noticed the physical failure of this part i would have had no idea it was actually bad. Just a heads up. I cant make any guarantees that this is a fix for low mpg but it helped me a lot.
hsitko is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 01-23-2011, 06:16 PM   #2 (permalink)
Senior Member
 
Join Date: Mar 2009
Location: 2000 5MT, Buffalo NY
Posts: 728
Default

A knock sensor is basically a microphone bolted to the cylinder head that "listens" for predetonation. Damage to the plastic part of the sensor has no impact on its performance, so long as the electrical connection is intact.

Predetonation damages an engine, so if any is detected, the timing is retarded. It shouldn't have any effect on your fuel economy. I'm pretty sure you're looking at noise in your fuel logs, unrelated to your knock sensor.
RobertSmalls is offline   Reply With Quote Quick reply to this message
Old 01-30-2011, 10:17 AM   #3 (permalink)
Senior Member
 
Join Date: Oct 2010
Location: Miami, FL
Posts: 193
Default

Who know's, maybe his knock sensors plastic being broken was causing it to pick up noise that was retarding his timing and wrecking FE. I just fixed a knock sensor CEL the other day on my buddies 04 civic, I thought the sensor was bad but while I was about to replace it I noticed the old one was loose, causing it to vibrate and pick up all sorts of noise. Tightened it back up and the CEL hasn't come back.
N2oExpresS2k is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Insight Central: Honda Insight Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
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.
Email Address:

Log-in


Thread Tools

Posting Rules
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.3

All times are GMT -4. The time now is 07:10 AM.



Powered by vBulletin® Copyright ©2000 - 2019, vBulletin Solutions, Inc.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.