engine knock? engine light?

[FaberNZ.blaaack-S15]

Hey guys so i've recently noticed my engine light coming on under high boost its not always on only when it gets to peak boost of whatever setting its on. I have 4 different boost settings lowest being 14psi highest 20psi. I've got to say this worries me I don't really have any idea why it's doing this. Thought it might be the engine knocking. Could it be something in the tune not right? what do I do about it. Car is 330hp with factory internals. Also it flickers on and off it's not a constant light on.

 

[Cap'n Crash]

If you have an apex'I pfc then certain things can be set as warnings that cause the engine management light to flash in rapid succession. Knock is one of these things, I believe it will flash once a knock reading of 40 out of 100 has been reached.

 

[FaberNZ.blaaack-S15]

so is it something i should worry about or? or has it been set like that to say its under alot of boost

 

[Auss15]

Yes, more then likely high knock levels which could mean its leaning out in the top end. It can also be set off if your injectors are maxing out or your airflow meter is maxing but not as common. The light does flicker when any of those reading are high.

Do you have a Power FC hand controller?

 

[spoonman]

are you running only on 98??

 

[FaberNZ.blaaack-S15]

yea i have a hand controller and only run on 98 ever

 

[Auss15]

Monitor your knock readings with your hand controller, that way you can see if it's a tune problem...

 

[FaberNZ.blaaack-S15]

ok what am i looking for when monitoring it? and how do i do it? like have to rev and what not

 

[Auss15]

In your basic settings menu you have a "Monitor" mode. Hi light that and hit next and it will give you a menu of things like boost, injector duty, knock, airflow, volts,speed etc. Highlight about 8 of them and hit next. You can by using the up and down arrows monitor either real time or peak readings.

 

[Chriscooke]

What spec are you running? Standard injectors?

 

[FaberNZ.blaaack-S15]

850cc injectors

 

[S15AK]

I wouldn't push it as it means the car isn't happy, take it to a mapper to get it checked out.. I've got a power FC and my ECU light flashed before now and it was of a high knock reading.

 

[FaberNZ.blaaack-S15]

hmm i have to go hours out of town to get it checked because no one where i live can do it.

 

[Auss15]

Check your knock readings.....get back to me..

 

[FaberNZ.blaaack-S15]

it got up to 10 max at 5800 rpm

 

[FaberNZ.blaaack-S15]

hold on hold on. that was just in neutral took it for a drive 3rd gear at 5800rpm what my limit is set to knock go up to 62.

 

[Cap'n Crash]

That'll be your problem there then, high knock levels setting the sensor off, I think it goes off at 40. As previously mentioned, could be a tune problem. Or even something loose banging around in the engine bay can be considered knock by the sensor which is essentially a sensitive microphone.

 

[FaberNZ.blaaack-S15]

hmm what do you suggest i do?

 

[Auss15]

I suggest you get it tuned, sounds like it's leaning out, a knock reading of 62 at 5800, which is just above mid range, is way to high. 20 would be more acceptable.

 

[spoonman]

take it too D tech but expect to pay lots and lots, or go to CDM and get the same thing and pay way less, both are in tauranga, you are only going for a dyno run to see what the map looks like so contact either of them and see what you can do