You forgot Closed loop status word (PID)?
does it do in light hot cruise. it must hold closed loop , if not and is in open loop fuel trim is not on line , accelerating or at WOT>
only idle and light hot cruise.
seems the ECU is in limphome.
on a 1995 car it would be 10x more rich then horrible rich, in 1996 this effect was greatly reduced OBD2.
Id fix idle first. if not in close loop then (hot engine) fix that, as car is parked and x10 more easy to fix any Parked car. and safer too.
in closed loop the PID scan and graphing (plot mode) of the front 02 it swings 6 times a second, this is the ECU hunting perfect combustion.
exh leaks any where near the 02 front is doomed to kill the 02, and goes HORRIBLY rich, unplug the o2 and now 0.45vdc is hard fixed at 02 ECU input pins, (a voltage divider magic thing) that will make it go learner, but not go closed loop like that, no 02.
no pulling the the 02 only shows it is too rich not way, lots of why's for sure even a bad engine, dead maf, or weak maf,
fuel pressure is good 31psi at idle right?
wrong p/n injectors not on the engine right?
injectors cushions (base side at intake manifold) not sucking air.
p0300 is all 4 cylinder random misfiring, (means combustion is weak, random) on all 4. (engine weak, fuel bad or spark bad caused)
that -25 STFT , my best guess, is old data stuck there not live at all. it is GHOST of the past. (seen it I have)
learn to read the CL/OL status PID first, OPEN loop is fixed first. OL
the 16v, take off the exhaust manifold shields yet see #3 cracked as they all did, when driving with CEL glowing for 50,000 miles, and cheap #2 gas.? Lol
fix idle first
fix closed loop dead.
parked.
if injectors are good and pressure good at idle, injectors can be pro cleaned, so they do no leak and full flow returned.
make sure the MAF is not dead/weak, (my MAF page shows the simple tests using any DMM ) i tested the snarf out of many to get the data seen here.
do know this the ECU does not report weak maf only the DEAD.
we do now the idle volts out. for sure
more tests not done, scans for PIDS do them. even log them and share them is no better thing to do.
ECT reads what hot, 180 to 200f is the answer never 150 or OMG less with silly fail safe thermostat stuck in lame , failed mode. yah a pain.
YOUR MAP READS WHAT AT IDLE?
https://fixkick.com/sensors/92-95MAF/92-...sting.html
(exact specification is 1.7–2.0 volts) at idle !!!, gunned it goes to 3v. (only flogged up hill hard will get max maf readings , I had to drive an log to see it) https://fixkick.com/sensors/92-95MAF/hills1.jpg
SEE MY GRAPHS THERE, DRIVING AND PLOTTING MAF, AND TP SENSOR SAME TIME.
MAF is a chicken and egg device, if weak there will be no power from the engine seen at the high end of the maf .... (well if not stuck in limp home that is)
Your post did not tell how much power the engine had . now.
new head.
if the cat melts the power will be horrible even 20 mph limited
even dead. (as it melts more)
and vacuum gauge attached, the vacuum seen (needle) is all backwards and crazy, due to engine can not pump air now, cat melted and blocking 1/2 or more.
if you have full engine power (or as good as it can be rich) then CAT is ok.
the engine going rich the CEL flashes at you driving
the flash means the CAT IS SOON TO DIE (melt) even says in the book drive easy no tailer pulls and get it fixed fast. (and is truth)
P0300s do that
the PCM knows fuel mix is rich and burning outside the engine, like rock engine, and all that unburned fuel extra burns the cat up and cracks the Exhaust manifold
just under those old cute shields, if still there. mine were.
my 96 day1 to me, I found mine cracked. (this also packed up the EGR full of carbon ,look like a wall of carbon)
good luck there are some tests there to do.
It can be fixed that is for sure.
your 02 front may be poisoned now.
some can be recovered with propane torched to the tip. burning off the carbon.
your ECU can not wake up the 02Front, and most times its not the 02 fault.
most times a bad 02F is just the heater is dead. super common fail that is.
my 96 would go closed loop fast, the 02 got hot and works correctly and swings, and CL sets in the PID status, fast. I bet yours is dead CL !
even not at 180f yet it gains CL, it may do it just past 150, as 150F is the threshold of the IAC, valve, thermal fast idle closes at 150f.
OBD2 wants to get CL fast as that saves fuel, smog and and then engine,lasts longer. and CAT lasts longer too.
does it do in light hot cruise. it must hold closed loop , if not and is in open loop fuel trim is not on line , accelerating or at WOT>
only idle and light hot cruise.
seems the ECU is in limphome.
on a 1995 car it would be 10x more rich then horrible rich, in 1996 this effect was greatly reduced OBD2.
Id fix idle first. if not in close loop then (hot engine) fix that, as car is parked and x10 more easy to fix any Parked car. and safer too.
in closed loop the PID scan and graphing (plot mode) of the front 02 it swings 6 times a second, this is the ECU hunting perfect combustion.
exh leaks any where near the 02 front is doomed to kill the 02, and goes HORRIBLY rich, unplug the o2 and now 0.45vdc is hard fixed at 02 ECU input pins, (a voltage divider magic thing) that will make it go learner, but not go closed loop like that, no 02.
no pulling the the 02 only shows it is too rich not way, lots of why's for sure even a bad engine, dead maf, or weak maf,
fuel pressure is good 31psi at idle right?
wrong p/n injectors not on the engine right?
injectors cushions (base side at intake manifold) not sucking air.
p0300 is all 4 cylinder random misfiring, (means combustion is weak, random) on all 4. (engine weak, fuel bad or spark bad caused)
that -25 STFT , my best guess, is old data stuck there not live at all. it is GHOST of the past. (seen it I have)
learn to read the CL/OL status PID first, OPEN loop is fixed first. OL
the 16v, take off the exhaust manifold shields yet see #3 cracked as they all did, when driving with CEL glowing for 50,000 miles, and cheap #2 gas.? Lol
fix idle first
fix closed loop dead.
parked.
if injectors are good and pressure good at idle, injectors can be pro cleaned, so they do no leak and full flow returned.
make sure the MAF is not dead/weak, (my MAF page shows the simple tests using any DMM ) i tested the snarf out of many to get the data seen here.
do know this the ECU does not report weak maf only the DEAD.
we do now the idle volts out. for sure
more tests not done, scans for PIDS do them. even log them and share them is no better thing to do.
ECT reads what hot, 180 to 200f is the answer never 150 or OMG less with silly fail safe thermostat stuck in lame , failed mode. yah a pain.
YOUR MAP READS WHAT AT IDLE?
https://fixkick.com/sensors/92-95MAF/92-...sting.html
(exact specification is 1.7–2.0 volts) at idle !!!, gunned it goes to 3v. (only flogged up hill hard will get max maf readings , I had to drive an log to see it) https://fixkick.com/sensors/92-95MAF/hills1.jpg
SEE MY GRAPHS THERE, DRIVING AND PLOTTING MAF, AND TP SENSOR SAME TIME.
MAF is a chicken and egg device, if weak there will be no power from the engine seen at the high end of the maf .... (well if not stuck in limp home that is)
Your post did not tell how much power the engine had . now.
new head.
if the cat melts the power will be horrible even 20 mph limited
even dead. (as it melts more)
and vacuum gauge attached, the vacuum seen (needle) is all backwards and crazy, due to engine can not pump air now, cat melted and blocking 1/2 or more.
if you have full engine power (or as good as it can be rich) then CAT is ok.
the engine going rich the CEL flashes at you driving
the flash means the CAT IS SOON TO DIE (melt) even says in the book drive easy no tailer pulls and get it fixed fast. (and is truth)
P0300s do that
the PCM knows fuel mix is rich and burning outside the engine, like rock engine, and all that unburned fuel extra burns the cat up and cracks the Exhaust manifold
just under those old cute shields, if still there. mine were.
my 96 day1 to me, I found mine cracked. (this also packed up the EGR full of carbon ,look like a wall of carbon)
good luck there are some tests there to do.
It can be fixed that is for sure.
your 02 front may be poisoned now.
some can be recovered with propane torched to the tip. burning off the carbon.
your ECU can not wake up the 02Front, and most times its not the 02 fault.
most times a bad 02F is just the heater is dead. super common fail that is.
my 96 would go closed loop fast, the 02 got hot and works correctly and swings, and CL sets in the PID status, fast. I bet yours is dead CL !
even not at 180f yet it gains CL, it may do it just past 150, as 150F is the threshold of the IAC, valve, thermal fast idle closes at 150f.
OBD2 wants to get CL fast as that saves fuel, smog and and then engine,lasts longer. and CAT lasts longer too.
http://www.fixkick.com