Re: egr system on toyota


"Joe" <steelhorse06@xxxxxxxxxxx> wrote in message
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On Sep 3, 2:41 am, "Ray O" <rokig...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:
"Joe" <steelhors...@xxxxxxxxxxx> wrote in message

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On Aug 31, 10:32 pm, "Ray O" <rokig...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:

"Joe" <steelhors...@xxxxxxxxxxx> wrote in message

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On Aug 31, 12:43 pm, "Ray O" <rokig...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:

"Joe" <steelhors...@xxxxxxxxxxx> wrote in message

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On Aug 12, 11:50 pm, "Ray O" <rokig...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:

"Joe" <steelhors...@xxxxxxxxxxx> wrote in message

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On Aug 12, 1:35 am, "Ray O" <rokig...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:

"Joe" <steelhors...@xxxxxxxxxxx> wrote in message

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On Jul 26, 11:45 pm, "Ray O"
<rokig...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:

"Joe" <steelhors...@xxxxxxxxxxx> wrote in message

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On Jul 25, 12:30 am, "Ray O"
<rokig...@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
wrote:

"john" <johngd...@xxxxxxxxxxx> wrote in message

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If you're getting the Insufficient Coolant Temperature code
then
your
car's ECU is NOT going into closed loop operation. During this
period
you'll likely have increased emissions that's damaging the
oxygen
sensors and catalytic converter. And if the mixture is running
too
rich, you can have a lot of carbon plugging things up too
(maybe
like
EGR valve, throttle body ports, etc).

So I think you should:

1. Sign on to Autozone's free repair
guide.http://www.autozone.com/autozone/

**********
I like Autozone's repair guides but unfortunately, the OP's
Paseo
is
not
one
with an available repair guide, and neither is the same model
year
Tercel.

*********

2. Test and/or replace engine coolant temperature sensor.
May look
like:http://www.rockauto.com/catalog/moreinfo.php?pk=482090
Check proper part number. About $31+shipping.

**********
The engine coolant temp sensor does not affect P0125. The ECU
detects
P0125
by lookinng at O2 sensor voltage that is out of range, either
from
an
open
or short in the sensor circuit, or an exhaust leak that is
introducing
air
to the exhaust stream, making the system think that it is
running
too
lean.
Since the OP mentioned an exhaust smell in the car, I think
the
OP
should
check for an exhaust leak.

**********

3. If you have more than 100K miles on the sensors, consider
replacing
them. Since sensors can be damaged by an out-of-tune engine,
it
helps
to make sure the engine is properly maintained.

*********
The OP replaced a sensor with an aftermarket one and now has a
problem
with
that sensor.

*********
--

Ray O
(correct punctuation to reply)

I noticed yesterday that my valve pan cover bolts were loose,
would
this have anything to do with my air flow. Since the pcv valve
runs
from valve cover to the intake. Every time I would blow into the
port
air would just seep out of the bolt holes from where they was
not
tight.
Joe

************
I doubt it, but you probably have a pretty good oil leak going,
so
it
is
worth tightening the bolts.
--

Ray O
(correct punctuation to reply)

Hey, its me again thought that I would write and tell you how its
been
going. I was able to locate an exhaust manifold for the car that
had
the 02 sensor still in it, with the original connector from the
car.
I
put it on and everything, and then reset the codes on my car.
Before
it was showing P0125 and P0135. Now it?s showing P0135 and P0401.
I
just don?t get it, when the check engine light is off the car does
fine no problems what so ever. As soon as the check engine light
comes
on the car starts acting up again. When you let off the gas, the
rpms
will jump down real quick below 1000, then jump back up. I figured
that if the egr system were messing up, it would possibly show the
code on the 02 sensor as well. I?m at a complete stop on here on
knowing what to do.
Thanks

Joe

********
The engine is not acting up because the check engine light comes
on;
the
check engine light comes on because the engine is acting up.

P0135 is bank 1 sensor 1 (the sensor on the exhaust manifold)
heater
circuit
malfunction. The O2 sensor has a built-in heater to help it reach
operating
temperature more quickly when the engine is warming up, and the
car's
electronic control unit (ECU) has detected a problem with the
heater
on
at
least 2 consecutive trips. While the car is out of emissions
compliance,
the heater has no effect on engine drivability, particularly when
the
engine
is warmed up, and is unlikely to be the cause of the drivability
problems.

P0401 is exhaust gas recirculation (EGR) insufficient flow
detected.
If
the
EGR valve is open or leaking at idle, you can get poor idling or
stalling,
because there is too much flow at idle when there should be none.
The
ECU
monitors exhaust gas flow through the EGR valve by monitoring the
temperature of the gas flowing out of the valve with an EGR gas
temperature
sensor. If the sensor is bad, you could get P0401 even though the
exhaust
gas is flowing properly or flowing when it should not be. I don't
know
the
correct voltage values from the sensor off hand, but sensor output
voltage
should vary when the EGR valve is opened.

Check the operation of the EGR modulator, EGR valve (to make sure
it
is
not
clogged or stuck in the open position), and operation of the EGR
temp
sensor.

Also check the condition of the ignition system - spark plug,
ignition
wires, distributor, rotor, and coil.

BTW, when I post suggestions, I try to list them in the order or
likely
cause so check stuff in the order that I list them, and try not to
skip
any
steps. If you don't understand a step, let me know and I'll try to
provide
additional detail.
--

Ray O
(correct punctuation to reply)

I was needing to ask you about the egr modulator. When its cold you
can plug both ends and it blows through just fine, but when its hot
and you plug both holes you can't get no air through what so ever. I
was reading a article on 02 sensors, it said something about if its
going bad then you will notice driveability problems with engine
hesitating and surging.

Joe

********
Try this link for an explanation on how the EGR system works and how
to
check the EGR vacuum modulator:
.http://www.autoshop101.com/forms/h61.pdf

Not all cars have an EGR vacuum modulator. An EGR vacuum modulator
looks
like a fat disc or flying saucer and has 3 ports labeled p, q, and
r.
If
the device you are looking at looks like a rectangular cube with 3
vacuum
ports and an electrical port, that is the vacuum switching valve
(VSV)
for
EGR and the check procedure is a little different.

While it is theoretically possible for a bad O2 sensor to cause a
drivability problem, in a vehicle with an OBD II system like your
car
has,
you would also get a trouble code relating to the O2 sensor signal
being
out
of range, which you do not have.
--

Ray O
(correct punctuation to reply)- Hide quoted text -

- Show quoted text -

Is it possible for a Throttle Position Sensor to throw a egr code.

JOE

*********
Not really. Also, a bad or mis-adjusted throttle position sensor would
have
a separate code and probably cause drivability problems.

If you are still having problems, buy, rent, or borrow a vacuum gauge
and
measure manifold vacuum at idle. You should have over 14 in. Hg.
--

Ray O
(correct punctuation to reply)

If you could follow this link, and tell me if this is what you are
talking about.
Its the only vacuum gauge that any of the auto part stores around here
carry.http://www.autozone.com/autozone/catalog/accessories/accessoriesShelf...

JOE

Yup, that should work. It looks like Autozone has the tool on their
loaner
program, or look up "Mighty Vac" for about $40 some place like eBay.
--

Ray O
(correct punctuation to reply)

Hey, I was going to tell you how I tested my system today. I teed a
line in between the egr valve and vacuum switching valve, with engine
at warm and just idling it was reading 3 on the needle. I then
connected E1 and TE1 on my box, and hooked Q line straight into the
tee. I held the engine at 2500 rpms and it read out about 13 on the
needle. I?m guessing this is normal, but I?m not for sure. I was
wondering if you knew how to test for an intake manifold leak, or for
a possible restricted exhaust. I also checked the vacuum lines
individually, and none of them were bad. If you could help me out I
sure would appreciate it.
Thanks

JOE

***********
13 inches of mercury (in. Hg) is a tad low but I don't think that it is
low
enough to cause problems. Ideally, you should have over 14 in Hg.

I'm not familiar with how to test for an intake manifold leak because I've
never run across one in a Toyota. Since you are getting decent vacuum,
your
intake manifold is probably OK.

A restricted exhaust probably would not set a trouble code, and the
vehicle
would perform poorly, like it is under-powered. If the engine runs OK, a
restricted exhaust is not very likely.

I don't remember if you have done this or not, but the next step is to
activate the EGR valve by applying vacuum directly to the modulator while
the engine is idling. The engine should start to run poorly and /or stall
when the EGR opens at idle. If you get no change in how the engine idles,
then the modulator isn't working, the EGR valve is stuck, or there is a
restriction in the tube between the EGR valve and intake manifold.

If the engine starts to idle poorly or stall when the EGR valve is open,
then check the EGR gas temperature sensor. The sensor should be right next
to the EGR valve in the tube between the EGR valve and intake. I don't
know
offhand what the specified voltages for the sensor are, but they should
change when the EGR valve opens and exhaust gas flows past the sensor.
--

Ray O
(correct punctuation to reply)

The next step

I will check my egr gas temperature thing out tomorrow. Today I put
vacuum on my line that goes to the canister. It was slowly losing
vacuum, so I tried the line itself and it was good. I also held up on
my egr valve instead of putting vacuum on it. When I push up on it,
the car stalls and tries to die.

JOE

What do you mean by "held up on my egr valve?" If opening the egr valve at
idle makes the car stall, then the egr exhaust gas temp sensor (or position
sensor if it has one instead of a gas temp sensor) is the next thing to
check.
--

Ray O
(correct punctuation to reply)


.

Relevant Pages

  • Re: egr system on toyota
    ... EGR valve, throttle body ports, etc). ... The engine coolant temp sensor does not affect P0125. ... or short in the sensor circuit, or an exhaust leak that is ...
    (alt.autos.toyota)
  • Re: egr system on toyota
    ... EGR valve, throttle body ports, etc). ... The engine coolant temp sensor does not affect P0125. ... check the EGR vacuum modulator: ...
    (alt.autos.toyota)
  • Re: egr system on toyota
    ... EGR valve, throttle body ports, etc). ... The engine coolant temp sensor does not affect P0125. ...
    (alt.autos.toyota)
  • Re: egr system on toyota
    ... EGR valve, throttle body ports, etc). ... The engine coolant temp sensor does not affect P0125. ... or short in the sensor circuit, or an exhaust leak that is introducing ...
    (alt.autos.toyota)
  • Re: egr system on toyota
    ... the check engine light is on and shows the egr valve ... leak, bad vacuum switching valve, or bad EGR modulator. ... The check engine light is still on, ... Air should flow from the air filter side freely. ...
    (alt.autos.toyota)
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