[urq] Fuelsystem diagnostics part3

[Patrick Carlier]

Today I took an intemediate step . 
I should do the injector leak and yield tests . 
But I decided to try and adjust the mixture strengtht first . 


I don't have a four gas analyser , but I do have a wideband . 
Innovate LM-1 , nice toy for a decent price . 

So I started the engine , wich fired at the first crank :) 
Allowed it to warm up and hooked up the wideband . 

Idle mixture was waaaay to rich . 
In fact it was so far off , it's a surprise the car would start . 
Anyway , I adjusted to 14.60 , wich should be close to 1% CO at idle . 
But then if I open the trottle just a bit an run the 
engine at 3000RPM , AFR readings drop an remain steady 
at 12.30 .  No that's pretty rich isn't it . 

If started leaning the idle mixture to 16.50AFR . 
Can't go higher cause idle becomes erratic . 
Stilll , at  3000rpm I  get an AFR OF 12.85 . 


Could it be that this rich condition is due to racing the engine with no load . 
I can't take it on the road yet to do some real testing . 
Does anyone know what AFR should be under normal driving conditions ? 

Pat