Can the OPEN LOOP MODE (o2 sensor unplug) causing the slow injection to fuel injectors? And dose it have anything to do with idle at all?

 

question #1 - what?

question #2 - yes

 

OK im sorry if my question was'nt clear im gonna try again.Here the question. What would happen if my o2 sensor is unplug ? I know its gonna throw a code but , dose it has anything to do with fuel system?

 

Your car will run richer in low throttle operation (closed loop). But if you are full throttle (open loop), there should not be a difference in performance.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AzSi22 &raquo;</TD></TR><TR><TD CLASS="quote">Your car will run richer in low throttle operation (closed loop). But if you are full throttle (open loop), there should not be a difference in performance. </TD></TR></TABLE>

Exactly.....being in open loop all the time will kill you mpg because the engine does not use the sensors for feedback to adjust fuel....only tps

 

My car will stay at 200 rpm( when crank ) and when i step on gas the rpm will move up slowly. Do you think its have something to do with that?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Iamhonda &raquo;</TD></TR><TR><TD CLASS="quote">My car will stay at 200 rpm( when crank ) and when i step on gas the rpm will move up slowly. Do you think its have something to do with that?</TD></TR></TABLE>

The car should still operate pretty well....my car is always in open-loop because of my mugen chipped p28....its runs great but gets horrible gas milage. Even around town its runs good....idles at about 800 but i dont use it as a daily driver. Bu the car does not rev any slower due to being so rich

 

but im running on stock p75 though. Im just trying to figure it out why my car acting funny. If OPEN LOOP is not the cause what could it be? I know it got something to do with my fuel system. Anyone got an idea?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Iamhonda &raquo;</TD></TR><TR><TD CLASS="quote">but im running on stock p75 though. Im just trying to figure it out why my car acting funny. If OPEN LOOP is not the cause what could it be? I know it got something to do with my fuel system. Anyone got an idea?</TD></TR></TABLE>

Ok the problem is probably why your running in open loop....you shouldnt be. If your 02 sensor is unplugged or damaged,plug it in or fix it. If your throwing any other codes check those and fix the problem.