no.
failsafe is always, ECU (sees what is wrong, and sets a code, and goes to failsafe and mimics what is dead)
sorry so slow, email failed.
lost means just that, the ECU shows no errors. at all, no CEL , no DTCs; no errors."data to humans"
lost means , for example, (just one of many) the fuel pressure is say at 60psi (say the FPR is bad as most are now) or return fuel line crushed from wild offroad events)
if the cat is the car is very very good, it eats the black smoke, that is it's job to do that, some fresh cats can to this , IMO , amazing amounts seen....
the bog down is , usually low fuel pressure.
if you feel it misfire, then that is just that, bad spark bad compression or flooding, with or with out black smoke)
The bog down, if not felt misfiring, i check fuel pressures. carefully.
if engine has full power , say cold, then its not a melted cat.
and is not a bad engine,
its EFI related.
if if can't feel misfire, it's not spark. see?
if it's a pure bog, its fuel starvation. keep i mine i cant drive car and feel this...
nor can i smell that hot stench from the cat ,eating up all the (unseen black smoke) the cat can glow red hot. doing this, and smells nasty !
this comment assumes nothing...
the EFI system here. will get confused for: (no DTCS) in no order.
1: fuel pressure wrong.
2: exhaust leaks near the upper 02 sensor;
3: dead cylinders. compression bad. 170 min.
4: 16v induction air leaks, excessive, will cause lean, (due to unmetered air reasons)
5: FPR gone wrong (stuck or leaking inside, or just wrong in some way, so many) really this is #1 just in more details.
6: a bad 02. (the early cars allowed the 02 to have too much control...... way too much "authority" , fixed in 1996 usa, and 1998 canada.) or caused by #2
7: maf weak, clean it.
im assuming engine reaches and holds 180F + temps. and good fuel.
and not at 10,000 altitude. (ee gads no air>?)
the maf is hardest to test. for accuracy. (dead is easy)
oops we found a bad FPR way back ?
the FPR must raise pressure (fuel) fully at wide open throttle.
it must. and does so from idle up to WOT>
you map is bad or the pump weak
do the shunt test yet.?
block the return line like the fsm shows for 1 second to see if the dead head hits 60psi, (55 is spec, IIRC)
your fuel pressure is bad , at idle, and all other modes are moot , if idle fails , and does.
key on, pressure is same as WOT, on a good car.
but your idle pressure is all wrong.
it will rise by 6PSI from idle to wot.
![[Image: reg-graph-mpi-g.jpg]](http://www.fixkick.com/INJECTORS/PUMP/reg-graph-mpi-g.jpg)
OK, here goes.
fuel press. @ key on= 41 psi (this is ok, its just the starting point before vacuum hits FPR)
after 5 min key off = 40 psi (this is great, it dont leak. nor injectors leak , nor pump check ball leaks, all good)
@800rpm= 40psi )(this is hard failure. see why? the VACUUM never lowered it to 41-6 = 35psi , showing FPR is DEAD ! (its bad, or vacuum to it Dead)
@5000rpm no load= 38psi (this is irrelevant, as the above must work for all other modes to work)
as you can see, the FPR, is totally Asleep (16v only , 8v works differently)
the ecu gets lost.
why?
because it (the brain) is hardcoded, for fuel pressure to be in spec. at all times.
if not in spec. the 02 can not correct the error and the 02 is shut down accelerating and is not part of the fueling equations.
so the MAF must work and the FPR must have pressures correct.
if the pressure is too low, the injections will below. (bogs)
its a moot point but fuel pressures flogging it up hill , must be 41psi, on this car. 41 is legal key on pressure, but not at idle. ever.
but is moot because the pressures are way too high at idle. so will be wrong all the time.
if the PFR is fixed.
and it still bogs,
then all 4 injectors are clogged, (partially)
one guy in Napal , here, fixed the bad injectors, (clogged) by monkeying (not him personally) the PFR to run super high pressures to hide the bad injectors.
we fixed the FPR now it bogs (from rich idle ,spark failing)
so end the end , the new clean injectors, no like the legit PFR.
as you can see , it is possible to have 4 clogged injectors and all 4 injectors flow the same (weak), and pass the balance test. (a rare thing)
i say all this because these old cars usually have 2 or 3 major parts bad, in the EFI.
also driving all day with 12s flashing. its harmless do it. on all 89-95 for best (diagnosis of all)
and not skipping the beat,, if you see the 12s act odd, in any way the ECU is bad. bad caps.
we've see the ECU halt mid flash sequence, (a sure sign of rebooting horrors)
failsafe is always, ECU (sees what is wrong, and sets a code, and goes to failsafe and mimics what is dead)
sorry so slow, email failed.
lost means just that, the ECU shows no errors. at all, no CEL , no DTCs; no errors."data to humans"
lost means , for example, (just one of many) the fuel pressure is say at 60psi (say the FPR is bad as most are now) or return fuel line crushed from wild offroad events)
if the cat is the car is very very good, it eats the black smoke, that is it's job to do that, some fresh cats can to this , IMO , amazing amounts seen....
the bog down is , usually low fuel pressure.
if you feel it misfire, then that is just that, bad spark bad compression or flooding, with or with out black smoke)
The bog down, if not felt misfiring, i check fuel pressures. carefully.
if engine has full power , say cold, then its not a melted cat.
and is not a bad engine,
its EFI related.
if if can't feel misfire, it's not spark. see?
if it's a pure bog, its fuel starvation. keep i mine i cant drive car and feel this...
nor can i smell that hot stench from the cat ,eating up all the (unseen black smoke) the cat can glow red hot. doing this, and smells nasty !
this comment assumes nothing...
the EFI system here. will get confused for: (no DTCS) in no order.
1: fuel pressure wrong.
2: exhaust leaks near the upper 02 sensor;
3: dead cylinders. compression bad. 170 min.
4: 16v induction air leaks, excessive, will cause lean, (due to unmetered air reasons)
5: FPR gone wrong (stuck or leaking inside, or just wrong in some way, so many) really this is #1 just in more details.
6: a bad 02. (the early cars allowed the 02 to have too much control...... way too much "authority" , fixed in 1996 usa, and 1998 canada.) or caused by #2
7: maf weak, clean it.
im assuming engine reaches and holds 180F + temps. and good fuel.
and not at 10,000 altitude. (ee gads no air>?)
the maf is hardest to test. for accuracy. (dead is easy)
oops we found a bad FPR way back ?
the FPR must raise pressure (fuel) fully at wide open throttle.
it must. and does so from idle up to WOT>
you map is bad or the pump weak
do the shunt test yet.?
block the return line like the fsm shows for 1 second to see if the dead head hits 60psi, (55 is spec, IIRC)
your fuel pressure is bad , at idle, and all other modes are moot , if idle fails , and does.
key on, pressure is same as WOT, on a good car.
but your idle pressure is all wrong.
it will rise by 6PSI from idle to wot.
OK, here goes.
fuel press. @ key on= 41 psi (this is ok, its just the starting point before vacuum hits FPR)
after 5 min key off = 40 psi (this is great, it dont leak. nor injectors leak , nor pump check ball leaks, all good)
@800rpm= 40psi )(this is hard failure. see why? the VACUUM never lowered it to 41-6 = 35psi , showing FPR is DEAD ! (its bad, or vacuum to it Dead)
@5000rpm no load= 38psi (this is irrelevant, as the above must work for all other modes to work)
as you can see, the FPR, is totally Asleep (16v only , 8v works differently)
the ecu gets lost.
why?
because it (the brain) is hardcoded, for fuel pressure to be in spec. at all times.
if not in spec. the 02 can not correct the error and the 02 is shut down accelerating and is not part of the fueling equations.
so the MAF must work and the FPR must have pressures correct.
if the pressure is too low, the injections will below. (bogs)
its a moot point but fuel pressures flogging it up hill , must be 41psi, on this car. 41 is legal key on pressure, but not at idle. ever.
but is moot because the pressures are way too high at idle. so will be wrong all the time.
if the PFR is fixed.
and it still bogs,
then all 4 injectors are clogged, (partially)
one guy in Napal , here, fixed the bad injectors, (clogged) by monkeying (not him personally) the PFR to run super high pressures to hide the bad injectors.
we fixed the FPR now it bogs (from rich idle ,spark failing)
so end the end , the new clean injectors, no like the legit PFR.
as you can see , it is possible to have 4 clogged injectors and all 4 injectors flow the same (weak), and pass the balance test. (a rare thing)
i say all this because these old cars usually have 2 or 3 major parts bad, in the EFI.
also driving all day with 12s flashing. its harmless do it. on all 89-95 for best (diagnosis of all)
and not skipping the beat,, if you see the 12s act odd, in any way the ECU is bad. bad caps.
we've see the ECU halt mid flash sequence, (a sure sign of rebooting horrors)
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