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Fuel System Open Loop Fault. In each of the fault conditions, the fuel rate is essentially 125% of the baseline flow, fulfilling the design objective of 80% rich. The vcm fueling generally operates in one of three modes:
How to Fix GM Open Loop Fuel System Fault Using HP Tuners 4.x YouTube from www.youtube.com
Justanswer is not responsible for posts. However, as i keep the engine idling for a long period of time the system enters closed loop and my fuel pressure stays constantly normal at 43psi with no misfire and oxygen sensors reading normally. The fuel system cannot deliver the proper fuel mixture if is stuck in open loop.
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In the other four cases the system operates open loop. However, as i keep the engine idling for a long period of time the system enters closed loop and my fuel pressure stays constantly normal at 43psi with no misfire and oxygen sensors reading normally. The fuel system status then went to open loop fault.
Fuel System 2 Status :
As soon as car gets its hiccup and starts shaking from rough idle: Open loop is used when the o2 sensors are not warmed up, failed, or when an enrichment mode (such as power enrichment) is active. Open loop stft is used on some pcm's when the o2 sensors are.
Fuel Trims Are At 0 At This Open Loop Fault Time.
The open loop fault 'could' be p0170 that 'might' be a intake air leak but its anybody's guess, see if you can get it scanned with something that will get all the codes and there descriptions. The descriptors for these codes indicate that there is a lack of switching from the upstream oxygen sensors as indicated by the processor. Acceleration and idle until warm up to around 145 degrees is classified as open loop operation.
It Runs And Drives Great, Has Plenty Of Power, It Doesn't Miss A Beat For The Most Part.
It should operate in closed loop when in idle. Im getting a fuel system #1 open loop fault with dtc p1132. 99 f150 fuel system 1:
The Vehicle Will Then Substitute Fuel Trim Corrections From The Good Bank To The Bank It Believes Has A Fault.
How to use hp tuners to determine open loop fault.0:24 add a channel called fuel system status channel 1 or channel 21:09 modifications that cause this probl. Readings that are noteworthy are as follows: If the engine fails to go into closed loop after it has warmed up or been driven, it may have a faulty coolant sensor or an open thermostat.
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