Engine Check Light

[Advan_01]

Hi Guys

Wondering if any of u guys actually had this problem before. Got my car tuned(Pow FC) about 2 weeks ago. I realised my engine check light starts flashing from 5000rpm to 6500rpm on 3rd and once in a while 2nd. Checked my knock readings which is about 80+ and that explains why the engine check light flashes. BUT this dont happen all the time, sometimes i get knock readings like an average of 25 which is very good at high revs on 3rd.

Q1) Why is my knock reading off by so much at high revs and shouldnt it be roughly the same?

Q2) Should I pull some timing out?

[R31Nismoid]

It depends what load map point is being read, and what the timing value is there.

Also the intake temps and other things affect it all

Simply put, if you note the speed/gear/rpm and throttle possie, the tuner will take all of 2-3 mins to find the cell(s) and adjust them.

Its a very minor problem and most tuners should fix it for free. I've never been charged for a minor adjustment.

While im here Advan_01 - i'll get back to you about the tyres during the week, they are at a mates place and i cant remember the diameter of them

[rob82]

Hi Guys

Wondering if any of u guys actually had this problem before. Got my car tuned(Pow FC) about 2 weeks ago. I realised my engine check light starts flashing from 5000rpm to 6500rpm on 3rd and once in a while 2nd. Checked my knock readings which is about 80+ and that explains why the engine check light flashes. BUT this dont happen all the time, sometimes i get knock readings like an average of 25 which is very good at high revs on 3rd.

Q1) Why is my knock reading off by so much at high revs and shouldnt it be roughly the same?

Q2) Should I pull some timing out?

Chances are it will have to do with intake air temps usually from heat soak of the intercooler while sitting in traffic with minimal air flow over the element. It may also happen in taller gears as the accelleration rate of the car slows with more speed on board. Manufacturers get around this by using a vehicle speed based spark retard map - aka V8 AU falcon.

Try to establish when it occurs ie. transient throttle, in traffic driving, highway driving, what is the ambient temps like, fuel quality etc etc.

[Advan_01]

Chances are it will have to do with intake air temps usually from heat soak of the intercooler while sitting in traffic with minimal air flow over the element. It may also happen in taller gears as the accelleration rate of the car slows with more speed on board. Manufacturers get around this by using a vehicle speed based spark retard map - aka V8 AU falcon.

Try to establish when it occurs ie. transient throttle, in traffic driving, highway driving, what is the ambient temps like, fuel quality etc etc.

ambient temp is about 25, running BP ultimate, no traffic. And how do i solve the problem?

[rob82]

ambient temp is about 25, running BP ultimate, no traffic. And how do i solve the problem?

Sounds like a fairly normal driving situation so I would be more enclined to retard the actual ignition timing in the IGN map at the load and rpm it occurs than to change any temperature based compensations.

[Cubes]

ambient temp is about 25, running BP ultimate, no traffic. And how do i solve the problem?

Take it back to the tuner and tell him under what conditions (throttle position (full, 1/2, 3/4), air temp etc) it knocks.

It may knock for example when you jump on the throttle at 5000rpm or it may only knock when loading up a high gear up a hill.