Dodgy knock sensor

[Chris32]

Anybody had any drama's with there knock sensors? on RB20's in particular

One of mine seems to be playing up and reading all over the shop, so much so that I have replaced my fuel pump as I thought it was fuel pressure related

I think I may have giving one a bit of a tweak ages ago while installing my oil cooler kit

My tuner says that everything is way conservative and the knock sensor is reading detonation (not consitsantly either) but there are no signs of detonation, and it happlily supports a extra 6 degree's timing before tell tale puffs of unburnt fuel from the exhaust, so its a long way off detonation, AFR's are low 11's

Everyhting has been checked, plugs, fuel pressure etc

I also had a new exhaust made up and we think that maybe the earth for the welder may have been positioned closely to one of the sensors (we can't remember) Would this cause damage?

Thanks in advance, Chris

[yogi000]

I had a problem with my knock sensors when i first got the car, it was a problem with the wiring, had a breakage in the wire cause the ecu to have abit of a fit and fart past 5000rpm. Took it to my mechanic and he rewired the knock sensors back to the ecu for me.

Now i have a pfc and my knock has never gone over 35 with the base map.

George

[Chris32]

Ok, I will get this checked. I have a spare motor to take parts of too, so might do some swapping

[Cubes]

Chris,

Where in the rpm does it usually show knock?

[Chris32]

Well its funny, as it has a quick flash up to about 70-75 at around 6000rpm from what Shaun was saying, but its definatly not detonating at all just showing up on the knock sensor :confused: Other than that is between 20-25? Also if I go over a pothole it shows knock of about 50? Something tells me the sensor may have a dodgy connection....

Will have to try the spare sensors I have, hopefully fixes it up

Can running good though, 1.3bar making 197rwkw and feels very strong on the road. I think my turbo might struggle to get to 220rwkw, but its heaps of fun like it is..........I am sure the driver of the Evo4 I surprised the other day can attest to this.........

[Cubes]

The pothole.. lol I'd say it was a dodgy knock sensor.

You run the 2510? Shauns dyno does appear to read lower than it used to so no doubt it may have been getting close with his old software/dyno what ever it was he upgraded/changed.

[Chris32]

yeah, pothole is what made me think last night that it must be a knock sensor problem, as Shaun said it would take 3 more degree's timing before it would start to show signs of detonation

By the looks of it, it's indeed a 2510, thought it may have been 2540/30 but it was the old tune that made it laggy, now its making boost at around 2000rpm and depending on what gear, on full boost by 3300-4000rpm so its very responsive now

[Blade]

If you get a knock reading of 22 on startup in the morning is that a dodgy knock sensor?

I also got readings of 122 on a cruise through kinglake in 5th gear, crusiing at around 70km/h tryin to prevent compressor surge, every time it fluttered my engine light flashed and i got a reading of around 120..