40.6psi (2.8 bar ) wrong, what was key on pressure.? same i bet.
when testing the fuel pressure there are 2 first tests on that page, i have, factory page , keyon, and idle. (id bet this fails) and was skipped
its a 6psi drop
http://www.fixkick.com/INJECTORS/PUMP/16...ess95W.jpg
the pressure is only steady at idle and steady cruise.
the pressure most goes up about .4 bar, gunning the throttle and drop fast as you cut throttle (high vacuum) this is the FPReg working.
the fuel pressure follows the vacuum bar, 1:1 one to one. in that , wot, is full (or near) atmospheric pressure, and the fuel pressure rises to meet..
from wot to cut throttle under huge vacuum the fuel pressure can drop a full 1 bar. end to end.
I just use a hand vacuum test gauge to check the FPReg at idle. easy, no driving and testing, under load.
yes,it is running bad. even parked it runs bad.
at 2000 RPM it surges.
(if you unplug the ISC connector, (iac electric) does the surge end? if yes, its the cause and is because the idle switch is set wrong or bad.
if the isc is not the cause, then its bad fuel mix, lean/rich repeat.
we have no scan tool to see if it drips closed loop, hooding , RPM at 2000,, I'd bet it is.
testing EFI blind is not easy.
for example is the PFREG messing up? or is it an input to the ECU wrong, or are the injectors clogged?
very hard to find this with no scan tool.
that is why i check the PFReg very carefully to put it out other 3 ideas list above.
lets look at my graph again.
key on, zero bar, vacuum. and say 36 psi fuel pressure, you start the engine and you pressure drop (fuel) to 30psi)
NO MATTER, where it starts it must drop.
metric. (sadly folks use 3 gauges, world wide, KPA,BAR and PSI..
at 0 bar vacuum the fuel pressure is 36 to 43 psi (varies by altitude and part variances) lets pick 40. (middle) or 2.8bar.
you start the engine and its hot and idle is 800 and the vacuum is now. 0.64bar
if you gun the engine and let it drop RPM fast the vacuum can go to 0.8 bar
the fuel pressure will track with the vacuum bar. 1 for 1. (the ECU is programmed for this GIVEN)
if the PFreg fails, the ECU FAILS to injector right.
ill add bar to the graph.
![[Image: reg-graph-mpi-g.jpg]](http://www.fixkick.com/INJECTORS/PUMP/reg-graph-mpi-g.jpg)
when testing the fuel pressure there are 2 first tests on that page, i have, factory page , keyon, and idle. (id bet this fails) and was skipped
its a 6psi drop
http://www.fixkick.com/INJECTORS/PUMP/16...ess95W.jpg
the pressure is only steady at idle and steady cruise.
the pressure most goes up about .4 bar, gunning the throttle and drop fast as you cut throttle (high vacuum) this is the FPReg working.
the fuel pressure follows the vacuum bar, 1:1 one to one. in that , wot, is full (or near) atmospheric pressure, and the fuel pressure rises to meet..
from wot to cut throttle under huge vacuum the fuel pressure can drop a full 1 bar. end to end.
I just use a hand vacuum test gauge to check the FPReg at idle. easy, no driving and testing, under load.
yes,it is running bad. even parked it runs bad.
at 2000 RPM it surges.
(if you unplug the ISC connector, (iac electric) does the surge end? if yes, its the cause and is because the idle switch is set wrong or bad.
if the isc is not the cause, then its bad fuel mix, lean/rich repeat.
we have no scan tool to see if it drips closed loop, hooding , RPM at 2000,, I'd bet it is.
testing EFI blind is not easy.
for example is the PFREG messing up? or is it an input to the ECU wrong, or are the injectors clogged?
very hard to find this with no scan tool.
that is why i check the PFReg very carefully to put it out other 3 ideas list above.
lets look at my graph again.
key on, zero bar, vacuum. and say 36 psi fuel pressure, you start the engine and you pressure drop (fuel) to 30psi)
NO MATTER, where it starts it must drop.
metric. (sadly folks use 3 gauges, world wide, KPA,BAR and PSI..
at 0 bar vacuum the fuel pressure is 36 to 43 psi (varies by altitude and part variances) lets pick 40. (middle) or 2.8bar.
you start the engine and its hot and idle is 800 and the vacuum is now. 0.64bar
if you gun the engine and let it drop RPM fast the vacuum can go to 0.8 bar
the fuel pressure will track with the vacuum bar. 1 for 1. (the ECU is programmed for this GIVEN)
if the PFreg fails, the ECU FAILS to injector right.
ill add bar to the graph.
http://www.fixkick.com