 secondary air valve
The idle roughness has been fixed, but the fuel consumption not, the MAF was not working properly eve thought it was fairly new, (it was an after market one), I got the Bosh one (original) and the roughness stopped, the fuel consumption dropped it varies from 27.6 to 27.0 when I was getting 29.5 or so.
Also I replaced the computer and tranny computer relays, because I started getting tranny issues, with codes 07-1A-1B (peake’s code reader), which are related to fuel trim. So fuel filter was replaced, fuel injector cleaned, fuel hose checked, but nothing was getting the engine roughness fixed, until I started doing some more test with the MAF, and indeed that was the issued.
There is a trend on the MAF issues and how to tested |