Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: expat on 17 March 2011, 15:31:32

Title: knock sensor
Post by: expat on 17 March 2011, 15:31:32

On a 2ltr ecotec engine, where do I find the knock sensor

Title: Re: knock sensor
Post by: feeutfo on 18 March 2011, 08:24:42

One for the 4pot owners....

Title: Re: knock sensor
Post by: RobG on 18 March 2011, 08:59:52

Knock sensor is located on number 2 pot below the inlet manifold.

The loom connector is on the underside of the plastic tray that sits on top of the injectors between number 3 and 4 injector plug. 

You can see it if you remove the alternator and it will be hiding behind the water pipe. 

Title: Re: knock sensor
Post by: Tonka. on 18 March 2011, 09:46:59

I know mine has two more pots  ;D but when I had a knock sensor fault a simple tank of good fuel cheered the engine up  ;)

Title: Re: knock sensor
Post by: expat on 18 March 2011, 14:42:40

Thanks for the help in locating the sensor. Will try to fit new sensor over weekend to see if it cures acceleration problem.
Will let you know how I get on.

Title: Re: knock sensor
Post by: expat on 19 March 2011, 15:35:52

Thanks to those that helped me locate the knock sensor. However the car does not seem to be wired for a knock sensor.
The problem is - on light acceleration it is not right but ok, but if you put your foot down it feels like running with the power of 3 cylinders as though the timing is wrong, then it has bursts of power. It does not feel like a misfire.
So far the garage has fitted a timing belt, , lamba sensor,cam sensor, throttle positioning sensor, new plugs, leads, air filter and airflow meter but the fault is still the same.
Ant ideas welcome.

Title: Re: knock sensor
Post by: Aundie on 19 March 2011, 23:06:35

coil pack?

Title: Re: knock sensor
Post by: expat on 21 March 2011, 14:52:33

Pull any plug lead off  and the engine "shakes", so I don't think its the coil pack. Does not feel like a misfire, rather like a loose distributor thats altering the timing.

Title: Re: knock sensor
Post by: Marks DTM Calib on 21 March 2011, 16:23:17

Quote

Pull any plug lead off  and the engine "shakes", so I don't think its the coil pack. Does not feel like a misfire, rather like a loose distributor thats altering the timing.

That proves nothing.

To the voltage required off a coil pack is dependent on load conditions etc.

To test it would require a test plug with a gap that is variablee upto and beyond 40mm.

As for a faulty knock sensor, is there a fault code of the knock sensor. Its not like the knock snsor can cause a miss fire  (its quite a slow control loop and advances until knock is detected and then backs it off).

As for the items changed so far, sounds like a garage who dont know what they are doing!  ;D :y

Title: Re: knock sensor
Post by: Abiton on 21 March 2011, 17:41:04

Click on this link and follow the 'paperclip test' instructions to see if your ECU has any fault code information stored:

http://www.omegaowners.com/forum/YaBB.pl?num=1189022687

 :)

Title: Re: knock sensor
Post by: expat on 21 March 2011, 17:56:00

The garage admited they don't know the problem. The problem is a delay in acceleration when you put your foot down, but when the power comes on, its not :-[ even. As I said, the reason they could not find the knock sensor is that there is no wireing in the loom for the sensor. p s.  In Portugal the car is called an Opel Omega 100. I don't know if this helps.

Title: Re: knock sensor
Post by: expat on 22 March 2011, 10:26:09

Thanks Abiton, did the paper clip test and found two codes.   -0130 and -0505. Do you know what they are for.?

Title: Re: knock sensor
Post by: Marks DTM Calib on 22 March 2011, 10:37:16

P0130      02 Sensor Range/Performance
P0505      Idle Air Control Voltage Low

The latter is a worry, sounds like a full strip and clean of the throttle body and breathers would be a good start and check the idle control valve (on the throttle body) is connected.