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Originally Posted by raymr
O2 is fine (new). The problem is during the period before closed loop. What other inputs control the warmup regulator, or is it completely stand-alone? I'd rather chase down a bad sensor than replace the WU regulator, which I understand is expensive.
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if yer fuel pressures are fine then i think yer stuck with the
warm up regulator. you do have other options like eng vac leaks
that need to be found with a smoke machine.
best,
george