Daz_WRX

Hi i installed a knock link this weekend and im having problems, i have mounted the sensor under the intercooler as advised but am getting no activity at all, only if i tap the sensor, tap the block and get nothing? i have adjusted the sensitivity and still nothing? Why? cheers

TonyBurns

iTrader: (3)

Did you take the car for a run out or did you just rev the engine???
(serious question!!)

Tony

Daz_WRX

driven it mate, not even one green led, not until you tap the sensor

zhastaph

The sensitivity should be turned to max.

I found tapping the block gives quite a dull noise that the knock sensor doesn't pick up so well, try tapping a bolt screwed into the block instead and see what happens.

TonyBurns

iTrader: (3)

Yup as zhastaph states, up to max, you should get the bottom green flash when you turn the car on (then goes very dull), even yesterday when driving my scoob hard (JDM STi) i only got the bottom green flashing and i wasnt going slow either

Tony

PS are you using octane booster with optimax?

zhastaph

First guy to moan cos he's got no knock link activity

I only ever see the odd green on mine when I mega rag it. I know mine works cos it lights up like a xmas tree from the noise of the starter engaging (self test mode ), plus I've had det in the past

Daz_WRX

tried that too, surely it should pick up road nosie too? also it said to check the continuety off the sensor, i did this and it didnt have any? tried it both ways round and no difference?

zhastaph

Not really, I may have had a green when bounding over a gurt bump, but nothing really. It only really listens for a noise of a certain frequency, a metal on metal whack normally does the trick.

Daz_WRX

which way is MAX on the sensitivity? Also my car suffers from piston slap when cold, should this also show up?

zhastaph

Fully clockwise. I don't know about piston slap, but I would have thought that that would've shown up on the greens.

Where under the IC did you mount it? Directly on the block?

TonyBurns

iTrader: (3)

The amazing thing for me is that my new car has less activity than the old one
Max is around to the right.

Tony

Daz_WRX

yes its mounted directly on the block, starange, so how do you guys check to see if your one are working?

TonyBurns

iTrader: (3)

a run out on max you should see engine noise towards the red line, best doing it in the dark though, depending where you have mounted your knocklink

Tony

Daz_WRX

in the centre console, will have to try it this evening, could the sensor be knackered?

TonyBurns

iTrader: (3)

I wouldnt have thought that the sensor is knackered, are you using one of the bosch ones?

Tony

Daz_WRX

certainly am, but it said to check continuety but i got no reading at all, so is it normal for the link not to light up at all?

cong

when you start the engine up first time the knock sensor should light up at least two greens i have a my99 and apexi induction kit and centre decat and backbox and when i go upto 6000 rpm i get 1 green, but you should have atleast 1 green glowing dimly anyway when on idle

Welloilbeefhooked

iTrader: (3)

Right, this is not very common but worth checking. My knocklink came with the red and black wires in the loom supplied the wrong way round. It was wired black to red and red to black.

Note that because of the checking procedure at the factory the units wiring is correct, just the wires in the loom that were wrong.

Heres is a pic with the loom highlighted.

http://www.zen24039.zen.co.uk/Scooby...k_full_kit.jpg

Daz_WRX

how do you mean check it? im a little confused? if it were to be the wrong way round the link wouldnt illuminate when i hit the sensor or would it?

AvalancheS8

So it does light up when you tap the sensor ? Does it flash greens and amber when you start the car ? Mine does this, but nothing else bar a few green flashes when revving right out to the redline on WOT. My car is slappy when it's cold too and it doesn't pick up that at all - presumably it is the wrong frequency and the Knocklink knows it's not knock. Your best check is the flash on starting the car, just as you turn the key and it engages the starter.

Daz_WRX

I havent noticed it flashing when starting, but will have a look later and see, i shall also check the sensitivity is on max, so thats all the way to the right if im looking at the unit with the leds facing me?

Daz_WRX

had a look last night and the 2nd green LED lights up for a split second when starting, so does this indicate everything is hunky dorey?

cong

yep sounds fine!

Welloilbeefhooked

iTrader: (3)

Daz,

Sorry mate, didn't read your thread properly.

dj219957

its always worth while to check for dry joints on the led legs.
Mine had two dry joints from new.
Take the board out of the black box and wiggle each led. Look for movement of the legs on the underside of the board.

Andy