Hey everyone… I have had a lot done to my integra ls and currently I keep throwing these codes at once ..my freeze frame I noticed short term fuel trim is 31.25% and long term is 20.31% at 1665 rpm going 40mph ….trying to figure out if I have air/vacuum leak or more fuel issues……only issue I have is at cold start it revs up like normal with a high idle then after 10 seconds it runs very rough as if it’s running on 2/3 cylinders but not throwing misfires codes … but once the needle reaches into the start of normal operating range the car goes back to running smooth as if nothing is wrong… I’m getting bad gas mileage ….any help I will be very appreciative! Thanks in ad

vance

 

I have experienced this . It was the evap purge valve. It was stuck open creating a vacuum leak.

 

Dumb question...do you mean the EVAP Canister Purge solenoid -or- the actual EVAP cansiter? I'm going through the same issues (to include the car is misfiring), so I'm thinking of trying to replace this on my 1999 LS