+15 or - 15,?
+ is adding fuel, if the 02 is old , the trim numbers will be wrong. the ECU assumes the 02 never lies or gets old.
im confused now, 2 trackers,
ok its the 96,
the G16b MPI engine the FPRreg is a very dynamic device, it increases fuel pressure 6PSI at wide open throttle.
yes, pulling vacuum line cause lean, big time, best is not to do that unless you wanted lean. LTFT will go PLUS side to match leak.
is o2 new? not 18 years old. (hopeless that)
is #4 exhaust tube cracked, like most are (from port 6 inches down hidden under shield"?)
idle is low across the board (how low, 800 or 500 ? or?)
ok the ecu can not control idle,
scan tool shows no DTCs, so its not in limphome, so idle controls are active hot, and must be 750 to 850 steady.
the perfect running engine runs -5 LTFT. (MINUS)
this this means the naturally rich MAF< (by design) by +5% is sucked back to STOICH by using -5% TRIM. (o2 good, or all readings are useless)
when you accelerate, or go WOT, the MAF rules AFR. and is +%5 rich or AFR 12:1 or near. closed loop is canceled now.
if the maf is lean you burn exh. valves fast. (flogged )
in closed loop the maf errors (by design) is compensated to STOICH. (at hot idle and light cruise steady right foot on flat ground)
I test (im sure yours is good now) at key on, leakdown test done then ,idling, the 1/2 throttle and gunned to WOT for 1second to see if fuel pressure are good for MPI.
this MPI does not like air leaks, all air leaks must be corrected by O2, if it can correct then it will go lean and bog or in some cases go rich and make more power.
is engine still starting slow?
i forgot to say in first post
is CLosed loop ok hot idle (CL = true) on scan tool?
and idle is bad.
hard starts still>
if CL is failing, i fix that first, find out why ECU sees sensors wrong, or are wrong.
that bad idle is for air leaks or CL is dead.
if CL is dead, that means AFR is out of control. that is why i fix that first. IDLE IS ALWAYS last, to fix and work right.
things that can make CL fail. (all G16b not just yours)
biased 02. (18 years old, sure)
air leaks from MAF to intake valves, every inch (air density system it is)
MAF weak. (or just dirty)
dirty injectors.
leaking injectors.
#4 exhaust port tube cracked, or any air leaks hear 02, upstream from exhaust ports to CAT brick.
(ill not list fuel pressure, im sure you checked it at 4 states at least)
ECT fibbing , no .
IAT fibbling ,no, in fact missing on 92s so only makes minuscule corrections.
isc sticking,
keep in mind EFI stuck rich may run beautifully, the engine makes max power at 12:1, so if stuck there, it does make more power, STOICH is max Mpg , in smog.
to get hot idle to 800 rpm? try turning the bleed screw, CCW, id count turns first. key off from closed (CW)
this is idle duty cycle set screw. but is air bleed.
get idle to 800 , so is it closed loop now? hot idle, if not we need to fix that.
as you turn screw, expect ECU to suddenly gain control of idle, the ECU is hard coded to 800 and the CKP sensors tells it RPM and with those 2 facts
it works full time servo mode to hold idle at 800. if it cant hold this speed it is because, of
1: egr leaking. (main)
2: or isc cant close. (common)
3: lean AFR , and CL false. (dead CL)
how is that.?
+ is adding fuel, if the 02 is old , the trim numbers will be wrong. the ECU assumes the 02 never lies or gets old.
im confused now, 2 trackers,
ok its the 96,
the G16b MPI engine the FPRreg is a very dynamic device, it increases fuel pressure 6PSI at wide open throttle.
yes, pulling vacuum line cause lean, big time, best is not to do that unless you wanted lean. LTFT will go PLUS side to match leak.
is o2 new? not 18 years old. (hopeless that)
is #4 exhaust tube cracked, like most are (from port 6 inches down hidden under shield"?)
idle is low across the board (how low, 800 or 500 ? or?)
ok the ecu can not control idle,
scan tool shows no DTCs, so its not in limphome, so idle controls are active hot, and must be 750 to 850 steady.
the perfect running engine runs -5 LTFT. (MINUS)
this this means the naturally rich MAF< (by design) by +5% is sucked back to STOICH by using -5% TRIM. (o2 good, or all readings are useless)
when you accelerate, or go WOT, the MAF rules AFR. and is +%5 rich or AFR 12:1 or near. closed loop is canceled now.
if the maf is lean you burn exh. valves fast. (flogged )
in closed loop the maf errors (by design) is compensated to STOICH. (at hot idle and light cruise steady right foot on flat ground)
I test (im sure yours is good now) at key on, leakdown test done then ,idling, the 1/2 throttle and gunned to WOT for 1second to see if fuel pressure are good for MPI.
this MPI does not like air leaks, all air leaks must be corrected by O2, if it can correct then it will go lean and bog or in some cases go rich and make more power.
is engine still starting slow?
i forgot to say in first post
is CLosed loop ok hot idle (CL = true) on scan tool?
and idle is bad.
hard starts still>
if CL is failing, i fix that first, find out why ECU sees sensors wrong, or are wrong.
that bad idle is for air leaks or CL is dead.
if CL is dead, that means AFR is out of control. that is why i fix that first. IDLE IS ALWAYS last, to fix and work right.
things that can make CL fail. (all G16b not just yours)
biased 02. (18 years old, sure)
air leaks from MAF to intake valves, every inch (air density system it is)
MAF weak. (or just dirty)
dirty injectors.
leaking injectors.
#4 exhaust port tube cracked, or any air leaks hear 02, upstream from exhaust ports to CAT brick.
(ill not list fuel pressure, im sure you checked it at 4 states at least)
ECT fibbing , no .
IAT fibbling ,no, in fact missing on 92s so only makes minuscule corrections.
isc sticking,
keep in mind EFI stuck rich may run beautifully, the engine makes max power at 12:1, so if stuck there, it does make more power, STOICH is max Mpg , in smog.
to get hot idle to 800 rpm? try turning the bleed screw, CCW, id count turns first. key off from closed (CW)
this is idle duty cycle set screw. but is air bleed.
get idle to 800 , so is it closed loop now? hot idle, if not we need to fix that.
as you turn screw, expect ECU to suddenly gain control of idle, the ECU is hard coded to 800 and the CKP sensors tells it RPM and with those 2 facts
it works full time servo mode to hold idle at 800. if it cant hold this speed it is because, of
1: egr leaking. (main)
2: or isc cant close. (common)
3: lean AFR , and CL false. (dead CL)
how is that.?
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