i need some advice on this one, im generally pretty good at electric issues but this ones got my chasing my tail...
most recent background:
i bought a harness and ecu from a guy on the forum. got it swapped in and all was fine for about an hour, then i had knock sensor codes...so i separated my knock sensor wires from my old loom and just taped/zip tied the wires for now. i drove about 500 miles to houston and back and it was perfect until the last 50 miles on my way home.
now when i go off throttle it throws a code 31 maf open or shorted and caused afr's to go into the 10's, once i get back on throttle, the code goes away, and afr goes back to normal...boost or cruising is fine, but once i let off throttle the cel comes on and if i stop too quickly it stalls out.
i havnt made it as far as back probing the ecu while its running but i have unplugged both ends and checked continuity/resistance. perfect 0.0 on all 5 wires to-from the maf plug. i had a spare sensor and swapped it in and it does the same exact thing...only active at idle and goes away and runs great anywhere else.
after searching a bit i read something that the ecu doesnt use the karman signal (ks) at cranking, is this true at idle as well? does anyone know what signal it actually uses during cranking? i assume something from the tps or cps?
id route new wires like i did before with the knock sensors but with my readings being 0.0, im thinking its either both of my maf sensors are bad (i know its possible but im doubting it greatly since the code goes away while driving) or maybe something else in the wiring is interfering until it gets a stronger signal??
any help is greatly appreciated
most recent background:
i bought a harness and ecu from a guy on the forum. got it swapped in and all was fine for about an hour, then i had knock sensor codes...so i separated my knock sensor wires from my old loom and just taped/zip tied the wires for now. i drove about 500 miles to houston and back and it was perfect until the last 50 miles on my way home.
now when i go off throttle it throws a code 31 maf open or shorted and caused afr's to go into the 10's, once i get back on throttle, the code goes away, and afr goes back to normal...boost or cruising is fine, but once i let off throttle the cel comes on and if i stop too quickly it stalls out.
i havnt made it as far as back probing the ecu while its running but i have unplugged both ends and checked continuity/resistance. perfect 0.0 on all 5 wires to-from the maf plug. i had a spare sensor and swapped it in and it does the same exact thing...only active at idle and goes away and runs great anywhere else.
after searching a bit i read something that the ecu doesnt use the karman signal (ks) at cranking, is this true at idle as well? does anyone know what signal it actually uses during cranking? i assume something from the tps or cps?
id route new wires like i did before with the knock sensors but with my readings being 0.0, im thinking its either both of my maf sensors are bad (i know its possible but im doubting it greatly since the code goes away while driving) or maybe something else in the wiring is interfering until it gets a stronger signal??
any help is greatly appreciated
