cant get pcm to open loop
09-14-2006, 11:57 AM
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cant get pcm to open loop 
Ive tried using bidirectional controls to no avail. Went into table b4205 closed loop temp enable and set to 250. flashscan still telling me closed loop. Any thoughts?Thanks scott
09-14-2006, 01:07 PM
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Originally Posted by Doc
Is the maf set to fail?
Open loop simply means the PCM doesn't adjust fueling based on the O2 sensors. It's basically like a carb'd setup where you set the fueling and go.
09-14-2006, 03:03 PM
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Originally Posted by SSpdDmon
MAF failure is for speed density, not open loop. Two totally different things. Speed density fueling calculations can still rely on the O2's for corrections (ie closed loop).
Open loop simply means the PCM doesn't adjust fueling based on the O2 sensors. It's basically like a carb'd setup where you set the fueling and go.
Open loop simply means the PCM doesn't adjust fueling based on the O2 sensors. It's basically like a carb'd setup where you set the fueling and go.
I just thought I'd elaborate for the newbs. Trending Topics
09-14-2006, 06:05 PM
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Oh crap, please listen to ffof67 and SSpeed...I was just scatterbrained-too many irons in the fire at once. As stated before, Speed Density has nothing to do with weather or not the car is in open or closed loop fueling, it merely implies your use of a maf. Sorry for the confusion. I wish I had a valid excuse for my faux pas but sadly, working 70 hours/a week for Uncle Sam and 30hrs for side projects is not a sufficient excuse on the subject for me- I need a vacation. 
09-14-2006, 06:13 PM
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Scott et all,
Forgive me for not asking this in the first place....You are not in Open loop when you "should be?" Correct? Which project are we talking about? Overall I assumed I knew which project/surrounding circumstances you were talking about and went off on a tangent that may or may not apply to your situation. Scott, let us know more about this project.
Forgive me for not asking this in the first place....You are not in Open loop when you "should be?" Correct? Which project are we talking about? Overall I assumed I knew which project/surrounding circumstances you were talking about and went off on a tangent that may or may not apply to your situation. Scott, let us know more about this project.
09-14-2006, 06:33 PM
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For lose that don’t know I swapped my 98 pcm for a 02. went to Holden crazy an got a file 99 to 02 os truck runs like crap even after swapping the 98 ve table. I don’t have a wide band yet but I thought that I could get it to run somewhat decent without it. So my thought was to set up open loop for time being right now all I have to do is move the truck around till its painted. Im sure its something im doing wrong but cant get it to switch to ol ive tried bidirectional controls and cl temp enable. The only mods to the engine no maf no egr any ideas or thoughts would be appreciated
scott
scott