Thread: too much O2 in exhaust gasses

When emissions were first looked at here years & years ago, a few manufacturers went down the air pump route. I'm not saying its the right thing to do with your P38 and it might not even suit a cat convertor system but it might be a last resort option if everything else has been done/looked at.

Some details here:
Secondary air injection - Wikipedia

I think that the measure is of CO. ( unburned hydrocarbons)

Usually with closed loop systems once the engine is warm, the system will run at near stoichiometric and be OK for CO.

I can remember the hints from long ago which include to go for a hard run before presenting for testing and ensuring the car is completely warm.

Thought, What is your thermostat doing? If you have too cool a thermostat ie 82C the engine may still be in enrichment mode or may still be in open loop.

Regards Philip A

naw,, fuel loop changes at 50 something,, (On the same year D2)

That's a good tip about the spindle seals !

Part numbers
AUD3577L
ERR4318

Steve

I should think that as far as cams are concerned the gems and thor are the same? In any case in my gems I have a piper285 and a tornado chip. afaik it should fit the thor as well. More mid torque and more high end power. The only real downside is a slightly rougher idle, but since the P38 is an auto box, you won't notice it unless the engine runs in park or neutral (unloaded)

I think there is your answer to unacceptable emissions.
Regards Philip A

Thank you all for the tips

down here at idle only co needs to be measured and it is well within parameters. We do also need to measure at a higher rpm. Usually 3krpm but for a handfull of cars there is an exception and there is one for the rover V8 as well we only need to go up to about 2400. The CO is well within bounds but the O2 effectively means (normally) unused air and would suggest the engine runs lean or somewhere "false" air get's into the system and that screws up the lambda, which needs to be between 0,97 and 1,03. I made it this time but I need to find the source of that air.

Regarding the different cam, I can see that if the cam timing would be too high it would possibly allow air in or smth? Last year when the cam was already in, before my big trip to the north cape, it passed the MOT without to much hassle so I am suspecting a different source of the problems.

I do indeed blast over the local industrial park a few times to get both the engine and the cats hot The thermostat is fine according to the engine management system. The only value that is quite a bit of is the air intake temperature. I'd say by about 10c. I guess that's the sensor that sits in the air filter box, right?

Cheers,
-P

My tornado (Thor) idles at 750,, AFAIK its to do with having the gearbox engaged?
I actually thought the rad end of a thor cam was different too,,,

what do you mean by cam timing too high?

too advanced?

There could of course be a leaking inlet manifold gasket. New gaskets relax after fitting and should be checked at least once after installation.