500 RPM is a hard, fail... (logic works many a ways, with so many symptoms.)
all you do is clean it, make it closed, and defeat it for testing, for now. (yes plug tube to it or it sucks air and 16v goes lean if that happens)
then open (CCW) the idle air bleed screw on the rear of the TB? can you get 800 now? HOT
no , big time problems.?
as you may know the 16v has 4 injectors that added 4 x all failure modes to the car.
quadruped troubles. (leaks , cogs, sticking ,etc) see my injector page for all tests there.
the 02, can fail in many a way, and only a scope can see all ways! (95)
bad idle ,yes,
bad mpg , yes.
i bet misfiring
I bet some power loss.
does it have full power WOT? ?
the 500 rpm is show stopping hard fail, find out why.?
I make sure my timing is correct with timing freeze jumper,
if the timing is retarded, 500 is the results. so......
compression good, check
spark good, fresh tuneup, timing right, and spark tips not fouling, are the?
all 4, always look at all 4 due to MPI injections.
that's all good. above? we then check fueling after spark tip check.
evidence, gather evidence.
tips white. ?
EGR is closed and DEFEATED, (so easy to do and makes diagnosis vastly more easy)
i then check the 02 for all these things, (you can't do all with a DMM) sorry .
1: stuck low
2: stuck high (not to mention, shifted.)
3: not swinging
4: swinging too slow (you cant do thatwith dmm) and all slow 02s waste fuel.
5: biased. (no man can do that. replace it) (it lies, it fibs, its poisoned )
im listing all ways, and all tests here, so if one is already done above ignore my mention of it.. Im blind and cant see car, the tests or missed symptoms......
The EGR IS just a valve.
pretend it your lawn sprinkler is stuck on.
you remove it and its stuck open, you clean it and now it is not.( lets move on?)
Get EGR MAIN, to close(and keep it there)
ever flex one (egrmain) on car?, i can flex it cold and tell you in 1 second, yes, it closed.
flex thump, flex thumb, flex hang, bad.
keep in mind the bad gasket here is going to leak air. very bad that. bad to bone.
one guy failed to even notice the EGR main was cracked, after 100 posts
he photos it and everyone laughs, gee fella. it's cracked casing. see my paper bag.....?
my point is, get it closed, i flex it and it goes THUNK, ok it's closed.
i then defeat it and fix that bad idle. an all OTHER SYMPTOMS NOW.
that idle is crying for help...... !
and if the o2 dont swing, that is YELLING for help. (at idle and cruise)
if running lean the ISC loses control
heck the ISC can sticking,,,, ever do the test on that?
you go factory air, im blind , do you, yes, turn on the A/c the button turns green
if fan off zero. and the AC clutch kicks in and the ECU see IDLE up command
the ECU then over drives the ISC and idle goes to 1000 rpm
or rises 200 rpm, does yours?
your ect at 300 ohms hot , is good, a scan tools would show that in 1 second flat.
these posts get long only for that fact, no scan tool.
if we had that, id bet we'd see.
and no closed loop
and LTFT stuck way off near or at the rails, 95 has excess rail hitting abilities.
corrected in 1996.
so can go like 60% rich,
LTFT is very accurate if you install a fresh 02.
i always do that on any old car.
i do that so my scan tool can see the truth. (a key stone sensor)
is your 02 heater drawing 1amp> at least. 12v into i think 12ohms (IIRC its on my 02 pages)
i told you the ECU has no heater monitor, so that job is the mechanics.
50 UK pounds for a scan tool.
i connect the tool
and see allsensors
i see RPM too low (if fix that )
i see closed loop. not happening at idle
i find o2 heater dead as doornail.
i find exh leak near 02
or i find air leaks amany from intake valves all the way to the maf.
i see maf is weak and the 02 can no compensate for this gross weakness.
see my looking at the EFI and motor as one systems?
is your car a 4 port egr or mono port.
the mono port has the SST sidewinder tube on the right side plenum box.
the 4 ports are a major PIA to get cleaned.
but for now ignore all that. defeat the EGR and fix all other issues.
then when it runs good, get mr. EGR back on line. last.
EGR means cool longer lasting exhaust valves.
is this too much info.?
then defeat the EGR (closes ) and fix that idle.
my bad idle page covers that well.
bad idle and misfiring are the most complex of topics
I got a bad idle , cold or hot engine!