This is very odd.

 

Stevemochan was good enough to come down with a Conzult to try fix my car. We connected it and fired the engine up, the timing was coming out at 35deg when cold down to 25deg when warm. The bizarre thing is that when I tried adjusting the CAS, the timing value from the Conzult remained unchanged!

 

I was wondering if the Conzult won't work with an ECU with a JWT chip fitted.

 

The CAS was obviously doing it's job as the engine speed changed when I adjusted the angle of it.

 

Any help would be appreciated.

 

Cheers,

Shaun

The ConZult timing figure is what the ecu is expecting given temperature and revs etc, it relies on the base mecanically adjusted timing (static) to be correct.

 

When adjusting the cas the ecu receives no return signal to know it is been moved so keeps reporting to the ConZult the required + base timing.

 

So given that it should be 15 deg when up to temp and at tick over, when the engine is cold or been reved up it adjusts accordingly via the ecu as base setting + what is required

 

So a 30deg Conzult timing readout when cold means that the with the correct base timing set at 15 deg that the ecu has added an extra 15 deg advance which hence added together is 30 deg btdc of course this is why the base setting therefore has to be right, this can only be done with a timing light and not via the ConZult.

 

As far as the 25 deg you are getting when warm, this is a known fault, was you car originally an automatic? if yes you need to earth out the neutral switch pin at the ecu which will correct this.

 

Hope that helps

 

Jeff TT

Aha, useful information. You are quite correct about it being an auto in the past. Does this mean that not earthing the neutral pin will make the car run incorrectly? or is it necessary for conzult purposes.

 

Cheers,

Shaun

Earthing out the neutral switch pin at the ecu will provide the "corrected" timing figure adjustment which can only improve general running and performance.

 

Jeff TT