reduce emissions

[Wain]

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]

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]

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]

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]

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]

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]

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]

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]

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]

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?

[flyerncle]

Run engine with return to header tank off and make sure you have a good flow to tank,if not you have flow/circulation problem or stat is playing up.

[Wain]

Ah so a cooling issue is causing the high emissions? I will take a better look at the cooling system at weekend in that case!

[flyerncle]

Yes and No,if you have flow problem its possible there is no liquid around sensor and it wont read properly and will compensate to keep within pre programmed limits allegedly.
Wont do head gasket a lot of good either and O2 goes high when it pops due to burning the water.