Still getting knock


New Member
Jan 2, 2002
I changed the MAF because mine was reading a little low
i recently put in a walbro 340 and chip and hotwired it

why am i still getting knock
i get it with dump both closed and open
i get it when i build boost 15 psi and above i think

if i plant my foot off idle i get the typical stumble (009s) then the boost builds and POP i get a lot of knock (11 degrees approx sometimes more or less) and a popping noise

if i ease into the car and build boost slowly its a little better but not much i still get knock just no popping

any ideas or things to look for????

Make sure these are good:
spark plugs gapped to .032
spark plug wires
coil pack
ignition module.