Still chasing a knock issue I’ve had for over a year. Because of life it has taken me way longer than I’d like. I can’t find anything loose whatsoever that would cause this.
is it possible that a fuel sensor or one of the pumps could be malfunctioning so intermittently that it doesn’t throw a code? I’ve monitored just today FRP actual and low side actual and noticed the low side dropped to 54 psi very briefly and thought it should be between 80-110ish. FRP dropped to 544 psi which doesn’t seem abnormal. But I’m NO pro whatsoever. I’ve read a lot that the low side sensor goes bad often so thought I would ask this question. I have had no codes to this point.
Random knocks ranging from -0.21 to -2.5ish. I’ll get a knock just starting to roll from a stop. Not WOT, but just coming out of a light, 1500 rpm or so. Also just when I’m cruising I’ll be at 2500 rpm steady going slightly uphill in 5th or 6th gear at about 1.5 psi of boost and get knock across cylinders, again just maintaining speed. I do get them at WOT but all of this happens intermittently.
sometimes I’ll do WOT with no knock events. I’ll go a couple days sometimes without them. Then some days I’ll get them more frequently. This happens in various driving conditions as mentioned ranging from super light driving to WOT. I’m going to check for the hundredth time I don’t have any vacuum leaks.
2016 Fist St
Mishimoto charge pipes
Mountune induction hose
Ramair crossover pipe
Mishimoto intercooler
St 200 air box
Ramair drop in air filter
Cobb RMM
Turbo technics S280 turbo
tune+ Turbosmart waste gate actuator
GFB DV+
Whoosh catted 3” downpipe
R&D 3” catback exhaust
Mild tune reaching 3.5 degrees adv.
is it possible that a fuel sensor or one of the pumps could be malfunctioning so intermittently that it doesn’t throw a code? I’ve monitored just today FRP actual and low side actual and noticed the low side dropped to 54 psi very briefly and thought it should be between 80-110ish. FRP dropped to 544 psi which doesn’t seem abnormal. But I’m NO pro whatsoever. I’ve read a lot that the low side sensor goes bad often so thought I would ask this question. I have had no codes to this point.
Random knocks ranging from -0.21 to -2.5ish. I’ll get a knock just starting to roll from a stop. Not WOT, but just coming out of a light, 1500 rpm or so. Also just when I’m cruising I’ll be at 2500 rpm steady going slightly uphill in 5th or 6th gear at about 1.5 psi of boost and get knock across cylinders, again just maintaining speed. I do get them at WOT but all of this happens intermittently.
sometimes I’ll do WOT with no knock events. I’ll go a couple days sometimes without them. Then some days I’ll get them more frequently. This happens in various driving conditions as mentioned ranging from super light driving to WOT. I’m going to check for the hundredth time I don’t have any vacuum leaks.
2016 Fist St
Mishimoto charge pipes
Mountune induction hose
Ramair crossover pipe
Mishimoto intercooler
St 200 air box
Ramair drop in air filter
Cobb RMM
Turbo technics S280 turbo
tune+ Turbosmart waste gate actuator
GFB DV+
Whoosh catted 3” downpipe
R&D 3” catback exhaust
Mild tune reaching 3.5 degrees adv.