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Username Post: '94 K2500 TBI Idle Control
Posts 169
06-15-21 06:46 AM - Post#2821625    

I’d check if you are getting into closed loop at idle. If you don’t get into closed loop it defaults to some, I think, rich setting. If you don’t have scanner memory is there are some pins on ALDL you can jump which will cause the CEL to flash differently in closed loop.
I had a “lazy” O2 once which changed fast enough to get into closed loop when driving but not fast enough to make criteria for closed loop at idle. It was causing me to fail emissions at idle.
65 Belair 350
68 Camaro 327
93 Suburban 5.7L TBI

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