Hey Scotty from Sweden! I watch your videos every day, you're great!
I have a saab 9-3 standard transmission 1,8t (2,0) 2007 with 200000 kilometer and on my yearly inspection it says on the lambda value (1,02) that it's running on to much air and not enough fuel. I changed the sparkplugs, oil, air filter, fuel filter, cleaned the m.a.f sensor earlier this year and I haven't driven that much since. On previous years the lambda value has increased since 2017 from 1,00 to 1,02 and the roof is 1,03. Do I have to change fuel pump or injectors?
Thanks for your knowledge from a happy saab owner Alex
Change the fuel filter first and then pressure test the fuel pump.
You might also have a vacuum leak that is causing the air fuel mixture to be very lean. Inspect for any crack vacuum hoses. You can also try scottys method by blowing some smoke into the intake and look for smoke coming out somewhere. Bad Oxygen sensor is another possibility. Lots of things can cause that.
