o/t Honda Prelude 2.2 emmisions problem
Turbo Mini Forums

Little brothers prelude has failed it's MOT on emmisions.

10% CO2
lambda betwwen 0.5 and 0.7

Basically running way too rich. He's had a new lambda/oxygen sesor fitted as the dodgy onboard diagnostic thing showed a fault with that. That dropped the CO2 down to 9% imdetiatly after. He's ran it for a while after that and the plugs are now back to a normal colour, but it's still not running right.

What areas should we be looking at? Dodgy injectors? Fuel preasure too high?

Thanks

has he reset the ecu after the new o2 sensor, dodgy jap stuff go through 02 sensors like no tomorrow,


after resetting the ecu fire it up it should go into fast idle for a couple minutes, and basically run like a bog of bollocks you need to drive it on the road to allow it to learn the new settings, up and down the revs light load and then heavy load

thats assuming its all due to to 02 sensor though

Yes i moved to the darkside

Instagram @jdm_brett

You can short a couple of pins on the diag port and watch a sequence of flashing lights to id any ecu fault codes.

That's what he did to get the oxygen sensor fault

ah cock... the only other things i can think of is the usual checking of the air filter etc...

actually it may be worth looking at the plugs and leads... dont buy the recommended plugs as they are £25 each iirc i used the accord type r ones that are about £22 a set.

If its a heated sensor, make sure the heater is getting 12v. Also, if there is an exhaust leak before the sensor, that will draw in air, confuse the ECU and add shit loads more fuel. Check the coolant temp sensor, and for what it is , probibly easier to replace it and completely eliminate it.

how were the hydrocarbons? the h22's dont have steel liners, and sometimes the rings get glazed and loose tehre ability to seal, failing the emissions as it starts to burn oil. just a thought.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

It's a 2 wire O2 sensor, so assumming it's not heated. There was a snapped stud on the ex manifold, but he had that fixed at the same time as the sensor was replaced.

He's working through sensors, so I'll tell him to check the coolant one.

Thanks for the advice.

responce from little brother: