PDA

View Full Version : misfire only under boost



maximajim
06-18-2005, 12:18 PM
I've been trying to correct this problem for some time. Previously it would misfire when cold and high rpm, but i've since changed the head gasket and used ARP studs.
When I did that I left a coupling loose creating a boost leak. When it had the leak, the Engine would rev to redline fine, just without boost. I've since corected that problem too. Now it misfires @~10psi.
I have taped coils, gapped NGK coppers heat range 7 down to 0.5mm.
Could the problem be not enough ignition advance? A/F are about ~11.2:1 and lower. Should I lean it abit?

cwdmark
06-18-2005, 02:29 PM
gap the plugs to .030 or .028. that should fix your problem. if not it could be the coilpacks.