Need help, Knock Sensor...

  #1  
Old 02-07-2005, 04:17 PM
Thread Starter
Join Date: Feb 2005
Posts: 2
Default Need help, Knock Sensor...

1990 Quattro Coupe, Knock Sensor. How can you check if the knock sensor is bad? My friend use the VAG (blue box) for Audi and we got an error (I don't remember, knock sensor 1... and something). There is anything I should do before ordering a new unit (diagnostic wise).

My car runs very poorly, lack of power and gas mileage is bad. I replaced already few items; I'm still having a problem. I'm sad; I like this car, but it cost a lot to keep it (parts cost a lot.....)

Need help.....

Thanks,
 
  #2  
Old 02-08-2005, 05:27 PM
2nd Gear
Join Date: Mar 2004
Location: Swamplands of NJ
Posts: 761
Default RE: Need help, Knock Sensor...

Once after doing some work on my fathers Chevy truck we took it for a test drive and noticed major loss of power. Turned out to be oxidation on the knock sensor connector.

On early GM vehicles one “seat of the pants” test trick that I have heard was while the engine is running, connect a timing light and tap the engine block with a metallic object next to the knock sensor. If the timing gets retarded you know that the system works. Don’t know if the same holds true for Audi’s. For one thing you will probably need to have the engine running above idle and the idle microswitch would have to be at non idle position.
 
  #3  
Old 02-09-2005, 02:47 AM
Thread Starter
Join Date: Feb 2005
Posts: 2
Default RE: Need help, Knock Sensor...

Thanks, I will do some tests over the weekand. The error code I get is "KNOCK SENSOR I-G61 NO SIGNAL" Is this mean that the knock sensor is "dead"? Or I can try something else before buying a new one.

Thanks,
 
  #4  
Old 02-09-2005, 03:47 PM
2nd Gear
Join Date: Mar 2004
Location: Swamplands of NJ
Posts: 761
Default RE: Need help, Knock Sensor...

I just read on one Volvo site that the "tap" test doesn't work with Bosch systems but might still be worth a try. I suspect that the sensor is "piezo" type with a ceramic element, when it subjected to vibration or pressure it produces a small amount of electricity. To test one on a bench might be very difficult. Check the connector and wiring first. On my 1991 100Q the corroded connectors are driving me nuts.
 
  #5  
Old 05-23-2010, 10:39 PM
1st Gear
Join Date: May 2010
Posts: 5
Default

i had purchased a 1964 chevy truck recently and there was this oxidation problem the engine was giving. something which i could not figure out.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
MoxUSC
B7 Models
0
12-10-2012 02:16 PM
kappy332
Audi TT
2
11-13-2010 11:49 AM
YounGMessiah
General Tech
2
09-01-2008 01:29 PM
a3square
Audi A4
2
01-16-2008 08:04 AM
ericbullock
Audi A4
18
06-22-2007 09:32 AM


Thread Tools
Search this Thread
Quick Reply: Need help, Knock Sensor...


Contact Us - 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.