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-   -   reduce emissions (http://www.haynes.co.uk/forums/showthread.php?t=13979)

Wain 13th October 2016 06:53 PM

reduce emissions
One of the points i have just failed on the IVA is for having high CO2 readings. I have a mx5 engine and a cat before the back box. Can anyone advise how i can bring my emissions down further? The IVA man mentioned some people, especially with motorbike engines are using a smart controller to control the emission output?

garyt 14th October 2016 05:42 PM

Hi is it the std ecu and induction side? As I had my mx5 with sports cat standard ecu and std plenum plus supercharger and it was spot on
Do you have the egr takeoff on your ex manifold going to the egr valve

Wain 14th October 2016 07:35 PM

I have a JDM loom hence there is no egr, i have blanked it off. shall i maybe look to try wiring it into the loom, if it can be done?

garyt 15th October 2016 11:37 AM

What ecu are you using ? The egr valve is there to help the emissions if yo have a programmable ecu then a remap session not for power but just to do the co2 to get you through iva then remap proper after if your going to end up with a Q reg then it would be an easy way to do it

Wain 15th October 2016 12:23 PM

The ECU and loom is from an import hence it doesnt have an egr valve connector as part of the loom. The engine does have and egr valve though hence i will try and wire it into the circuit if its possible without it being controlled by the ecu.
Failing that i guess i can ask my local garage if they can help remapping it...

Wain 16th October 2016 03:45 PM

Just checked and there is no connector in the loom for the egr valve. Any ideas how i can wire it into the loom but not controlled by the ecu?

PorkChop 16th October 2016 06:19 PM

How will the EGR valve be controlled if it isn't connected to the ECU? That is assuming that the JDM ECU has the controller logic installed/switched on for the EGR valve in the first place...

I think you need to go back to the beginning. The EGR is a red herring.

Are you sure you're talking about CO2?

If you're talking about CO, which I suspect you are, then what limit did it fail, at what lambda etc.? What limit did it have to meet? What were the HCs like?

Wain 16th October 2016 08:03 PM

I hope there is an easier soution to this, and yes it is CO not CO2. Ooops.
I was reading 0.68 at fast idle and need 0.20 to pass. Lambda pasted fine, HC is 88.

flyerncle 17th October 2016 10:44 AM

O2 sensor 1 in manifold controls fuel in relation to rear O2 sensor,ect switch also controls fuel in relation to temp,so possibly ect switch is faulty.

Wain 17th October 2016 01:10 PM

I think we might be onto something with the ECT sensor, after we did the emissions test the engine was very hot as expected but then cut out after back firing a bit. It starts fine now its cool so can only assume it over heated, water pipes were warm but not as hot as i expected. Maybe the sensor is ok but an issue with the coolant not circulating?

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