MEGAsquirt A place to collectively sort out this megasquirt gizmo
Sponsored by:
Sponsored by:

How Do I Test '99 Knock Sensor?

 
Old 10-28-2018, 10:23 AM
  #1  
Newb
Thread Starter
 
Join Date: Oct 2018
Location: Fort Wayne, IN
Posts: 13
Total Cats: 4
Default How Do I Test '99 Knock Sensor?

I'm new to tuning and want to make sure my knock sensor works before I start changing values.

I have a MS3 PNP with Tuner Studio Ultra and 1999 Miata.

In Tuner Studio, how can I see that knock has happened? (Also, how to I safely, temporarily introduce it for testing purposes?)
Is there a way to test the sensor itself?
I tried taking the knock sensor off the block yesterday to look at it, but it wouldn't budge. Any advice?

This is how I found my knock sensor wiring yesterday.


:/
zeek55wb is offline  
Old 10-28-2018, 02:21 PM
  #2  
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,284
Total Cats: 1,998
Default

Hit the sensor with a screwdriver.
__________________
Trackspeed Engineering
High-Performance Turbo Specialists - Sunnyvale, CA - 650-701-7223 - Email us!
Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
Savington is offline  
Old 10-28-2018, 05:21 PM
  #3  
Newb
Thread Starter
 
Join Date: Oct 2018
Location: Fort Wayne, IN
Posts: 13
Total Cats: 4
Default

I tried hitting the block near the sensor with a socket extension but didn't see anything show up in Tuner Studio.
Maybe I should actually tap the sensor itself.

Here is how my gauge cluster is set up right now.
Didn't get see a reading on any of these while tapping.

zeek55wb is offline  
Old 10-28-2018, 08:21 PM
  #4  
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,284
Total Cats: 1,998
Default

You won't see anything show up in TS. The "Knock" light is going to blip very quickly, and that assumes you have all the settings right already. Start a datalog, tap the sensor with a screwdriver a few times, then stop the log. You should see a change in the raw knock input.
__________________
Trackspeed Engineering
High-Performance Turbo Specialists - Sunnyvale, CA - 650-701-7223 - Email us!
Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
Savington is offline  
Old 10-28-2018, 08:31 PM
  #5  
Newb
Thread Starter
 
Join Date: Oct 2018
Location: Fort Wayne, IN
Posts: 13
Total Cats: 4
Default

That makes more sense.
I'll give that a go when I'm back with the car.
Thank you sir!
zeek55wb is offline  
Old 10-28-2018, 08:37 PM
  #6  
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,284
Total Cats: 1,998
Default

Alternatively, just hook the damn sensor up. It's a single shielded wire, so the input goes to the ECU and the shield gets grounded. Once it's hooked up, you can just blip the throttle and see the raw value change. If it doesn't change, it's not working.
__________________
Trackspeed Engineering
High-Performance Turbo Specialists - Sunnyvale, CA - 650-701-7223 - Email us!
Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
Savington is offline  
Old 10-30-2018, 07:34 PM
  #7  
Newb
Thread Starter
 
Join Date: Oct 2018
Location: Fort Wayne, IN
Posts: 13
Total Cats: 4
Default

I looked at my logs in MegaLogViewer but couldn't figure out how to view the knock input.

When you say "blip the throttle and see the raw value change", that means my column of green knock inputs (in my dashboard screenshot) should show something higher than 0.0?

I attached a recent data log.
Attached Files

Last edited by zeek55wb; 10-30-2018 at 07:58 PM. Reason: Added data log
zeek55wb is offline  
Old 12-01-2018, 04:17 PM
  #8  
Newb
Thread Starter
 
Join Date: Oct 2018
Location: Fort Wayne, IN
Posts: 13
Total Cats: 4
Default

zeek55wb is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
one-niner
MEGAsquirt
0
08-03-2012 03:48 AM
diddy
Miata parts for sale/trade
5
07-07-2012 02:32 PM


Thread Tools
Search this Thread
Quick Reply: How Do I Test '99 Knock Sensor?


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.