Ive got a WOT hesitation with backfire/ spark knock that I can't figure out.
It's a TBI. I've checked the fuel pressure. Ran off portable tank. Both fuel filters are new. Distributor cap, rotor and plugs new last year. Plug wires new. Checked the timing.
I've got a EFI live data scanner, nothin obvious showing
Plugs show rich mixture.
Compression's good
Map sensor seems to be right.
Throttle position sensor voltage may be off at wot. I read it should be 4.5. Ive got 4.0 at wot. But not sure if this is normal range