Can anyone help with my "pinging " problem?
I have a 2010 5.4 with a custom SCT tune and have a strange pinging problem that I don't think is timing related.
I have bought tunes from VMP and 5 Star in approx 8 configurations and cannot get rid of the sound. They have tried retarding the timing etc... to no avail.
The pinging is most noticeable after the truck warms up and also in the lower RPM range like right after it shifts and I feather the gas a bit. I've also noticed that it is less noticeable at higher elevation.
It has been suggested to me that it could be a VCT solenoid problem. Below is a quote that I received from another member
"Well, I unplugged both VCT solenoids with the tune installed and the sound completed disappears. Test drove the truck with no sound- although it lacked power from the cams being stuck fully retarded. So I took a step further and swapped solenoids with a buddies truck and the problem was corrected.
The solenoids are pulse width from 0-100%, so most likely mine weren't operating at full Span, but not enough to set any engine codes but became more prevalent with the tuner."
What do you guys think? I'm thinking I should try to unplug the VCTs and see if it helps???? Does anyone know where they're located?
Any other ideas?