closed loop vs open loop

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May 8, 2001 | 09:23 PM
  #1  
I dont understand this. Someone please explain what they mean. Also how can you tell when you are in one and not the other.

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89 camaro 305 tbi, flomaster 3 chamber cat back, gutted cat, Edlebrock TES Headers, Exhaust cutout, Edlebrock open element, and a 160 degree T-stat. 2 kicker comp 12"'s, polk for the rest. Phoenix gold xs2300 to subs, kicker impulse 404XI to 4 speakers, pioneer DEH- P7000R head unit, and finally a 12 disc changer. Full leather interior from http://www.MrMikes.com (its nice)
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May 8, 2001 | 10:29 PM
  #2  
Closed loop mode is when the computer uses the oxygen sensor input to adjust fuel delivery to keep air/fuel ratio in the right range. The oxygen sensor is ignored in open loop mode.

The car will enter closed loop when it's warmed up and at "normal" throttle. If it isn't warmed up yet, or you're standing on the throttle it'll go into open loop mode.

-Mark W.
'88 SC Camaro w/ 305 TBI
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