Swoop,
Were having a similar issue.
cat GC30K s/n: AT83C000805
fuel system is tier 1
ECM with vacuum line
no check valve in line with vacuum hose
replaced ecu 90401-06396
we have the ecu setup instruction for the S15G tier 1 fuel system
but not exact to ours system. we have no oxygen sensor and the wires are not the same colors.
we did try to calibrating by using vom but not accelerating.
any additonal ideas? what other parts should we id t get the correct setup
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