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cold running O2 readings
Posted: Thu Oct 06, 2011 10:48 pm
by Coops
what sort of readings should i be aiming for when starting from cold?
Posted: Fri Oct 07, 2011 8:24 am
by DaveEFI
I'm not sure just how reliable an O2 sensor reading is at idle on a cold start.
I suspect not very. Mine reads about 11:1. But found the cranking pulsewidth the critical thing for a cold start.
Re: cold running O2 readings
Posted: Fri Oct 07, 2011 4:42 pm
by stevieturbo
Coops wrote:what sort of readings should i be aiming for when starting from cold?
As lean as you can that allows the engine to run nicely.
There is no correct AFR, and every setup will be different.
Posted: Fri Oct 07, 2011 4:54 pm
by sidecar
Here's a theory....
The AFR should be the same as when the engine is hot, the amount of fuel that you need to feed the engine will be more than when the engine is hot due to a lot of it sticking to the cold inlet track walls along with some of it returning back into a liquid form from its vapour form.
I run an Eddy 500 with no choke fitted at all, when my engine is cold the lambda probe show all the mixture circuits to be a bit leaner than when the engine is hot due to the loss of fuel burnable fuel in the inlet manifold.
Of course the above could be a load of old...
Posted: Fri Oct 07, 2011 6:27 pm
by JSF55
sidecar wrote:Here's a theory....
The AFR should be the same as when the engine is hot, the amount of fuel that you need to feed the engine will be more than when the engine is hot due to a lot of it sticking to the cold inlet track walls along with some of it returning back into a liquid form from its vapour form.
I run an Eddy 500 with no choke fitted at all, when my engine is cold the lambda probe show all the mixture circuits to be a bit leaner than when the engine is hot due to the loss of fuel burnable fuel in the inlet manifold.
Of course the above could be a load of old...
Mines the same
