knock sensor

[Phillip1993]

Ok so connected my car up to my computer today and whent for a spin I noticed the knock sensor was retarding the engine by 6 degrees when putting my foot down is this normal and if so wot would cuse this??

[Scoobyghost]

Could be many causes. What fuel are you using?

[Phillip1993]

Normal 95 at the moment

[Scoobyghost]

That would be the first thing to change. Using a higher octane fuel ideally 99 will reduce knock/detonation which means the sensor won't be telling the ecu to ret.ard(avoiding swear filter) the timing.

[Phillip1993]

Ok wot else could cuse the problem do you think

[Scoobyghost]

Old spark plugs, weak engine mounts, dodgy sensor. Before running down the more expensive route, try a tank of high octane fuel through the car and you'll see an improvement all round.

Even if the knock sensor is slightly lose it will rattle and "detect knock" quite a simple sensor really.

[Phillip1993]

Ok I will try that it has had a new sensor already and new plugs

[Phillip1993]

By the looks of it this is all down to bad coil packs