i see you get the same emails i get.
he checked for bad fuses but not missing... this was the first error.
the op guide on all car shows each fuse and it's function.(so do all 3 online FSM)
non opted functions,may not have fuses.
FYI: (how to find limp home, notice many hard fails on old neglected cars)
14 mins into VID,see the fuel trim is dead, but 02 sensors working
the means he ECU is in LIMP. (mpg horrible) A FORD deal
all can be done with out OBD2 or that high end tool.
notice the fallacy: (stated this forum , over and over (not 1.6L)
no timing adjustments! Duane mentions it as a dig. (good)
sure, but that don;t mean you don't LOOK! duh?
the jogging timing would have been clear, the mechanical, failures! timing jitter.
In the video. the owner abandoned it, with it's many faults, ....
btw , if you get the motor running perfect at"stoich", ive seen many 02 wake
back up form AF poisoning.
Limphome keeps them dead and full of carbon, once repaired right
they get real hot and can bake out good.
FYI hints.... for DYI (hope happens if lucky)
all techs,check fuses first, pros use a meter, as fuses can look good
and be bad (hair line cracks) (once burned ,twice shy)
also the heaters all love to fail. in the 02 , it's there thing.. and
so, do wires on them melting on the exh, pipe. (missing clamps ,typical)
so ,02 fuses blows. (PO got quoted, $200 each for new 02 , my guess)
on Suzuki (96+) the ecu reports this , i guess FORD dont. DTC P0135 never lies!
he would have seen the 02 sensors wake up way too late. and not at all at idle.
or keep dropping out
most wake up 10 seconds. key on. (in the Bosch spec, no secret.and is EPA spec'd)
keep mind this video is for 96+ cars only and fords, are odd beasts.
how would this play out on say a 95 MPI KICK.
1; car runs rich and has 18mpg fuel usage. crying towel?
motor tests good, and as the video shows, the cat is under 1psi under load of tranny.
spec is <2psi 2500rpm (suz)
spark hot, and static time working, and spark does not advance off the scale at 3000 RPM./ ops, Evidence failure #1.
he has a scan tool and sees no CLOSED loop hot idle.
using manual O2 monitors. (other tools)
uses a scope or GMM ,DSO or high end DMM to see if the 02 swings. DSO rules roost
some cars, swing in limp home, but the Closed loop is not happening. Like in Vid.
on Suzuki it usually swings and is proof NONE limphome, (fails safe is suz,name)
as my 0bd2 page shows, i always check 3 things (applies to all EFI cars)
1: 02 fast wake up. 10seconds,
2 CL now. at idle. holding and at steady cruise. say 2500 rpm,
3:LTFT and STFT working. not dead.
the ECU may drop closed loop with the DRIVE tests,(in VID) due to low fuel pressure.
sure can. (ecu cant get the 02 to cross, 0.5v due to gross lean running.)
with no scan tool ,you can only see, 02 signals.
(you can not communicate with the ECU. with no scan tool, so the tech must work hard for evidence.... very hard. )
Keep in mind, that there are vast numbers of ECU. on many cars. and years
and some may drop closed loop, CL, for other ECU reasons
, many have other inputs
to said ECU that can cause that. That is why you need a FSM
to understand what those logic rules are. (not all ECU's work the same,)
Limphome happens for 5 reasons: (at least)
1: Gross DTC fails on major sensors. (the FSM lists them) MAP/MAP, TPS, ECT....etc.
2 one or more sensors, so far off ,it can not PULL the 02 across the .5v transition
3: each for UNKNOWN reasons (it's not a diety) can not find the 02 transition .
4: some other reason , listed in the FSM. (how about, zero 02 heater current?)
5: all the above can be ok.? but the fuel pressure drops , under real engine loads
that is, in Drive , say the pressure dropped to 15PSI. the 02 sensors go lean.
the ECU is flummoxed and CL, ends.
Keep in mind the VIDEO is for FORDs, a whole different system.
i use my ammeter clamp on all cars with no OBD live current monitor ( pre 96s)
it reads 1amp, about
if zero ANPS I check voltage, to heater,then it check, ohms. the Bosch data sheet shows
all these specs, are published .
if the heater is dead, MPG will suffer,at idle and low speed. (way bad city MPG)
too bad no CL lamp on the dash of car but and AFR meter,will be a good substitute.
just that 1 lamp can save you from wasting fuel too. drive in such a way to keep
the lamp on. as much as possible.... or the gauge at stoich.
keys: Limp in, limp home, fail safe.