VistaBlue09GT
Junior Member
Hey there everyone new here and wanted to run some stuff by everyone see if someone has had a similar issue and or a correction to my problem. I have recently started experiencing a backfire when in WOT mostly in second gear around 2500 to 3k only a few times has it happened in first gear. It has not happened any other time in normal day to day driving or at idle but only when in full throttle. I did some data logging and sent it off to be looked at an all they have come up with so far hasn't helped me much. To paraphrase a little they are telling me by the data shown is that at idle I am getting 20% more fuel but when the vehicle is under load the problem goes away an that the data they are looking at leads them to believe that it is a vacuum leak and they are sticking by that story. I have since ran multiple test of which when running a vacuum test at idle the pressure was holding at 13in and I also ran a test on fuel pressure which held at 37psi and when the vacuum line was removed from the regulator is increased to 41psi showing to me it was working properly. I have also tried spraying some carb cleaner around the intake and lines to see if it would effect the idle at all but nothing. I don't hear any whistle noise or anything abnormal either. I am not convinced that it isn't in the tune it's self any help given or ideas are appreciated. list of mods if needs are listed in my signature.