96 camry stalling... hmm...

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Old 24 Mar 2006, 05:15 pm   #1 (permalink)
mrdarrett@gmail.com
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Default 96 camry stalling... hmm...

Ok, here's the situation. Maybe once a month, when stopped at a stop
sign or stop light, my '96 camry will suddenly drop in RPMs.
Sometimes, if I quickly shift to neutral then tap the gas, this will
rescue it. Other times, the car stalls outright, and needs to be
restarted (but is usually fine after that).

I've already cleaned the throttle plate with throttle plate cleaner,
and sprayed throttle plate cleaner AND Tri-flow teflon into the idle
air control valve intake.

Still seems like it's stalling, about once a month.

Mechanic told me that I've got a slow distributor O-ring oil leak.
Been postponing the O-ring change, but now I'm wondering if the oil is
getting into the distributor. If this is the case, would a
once-a-month stall be caused by oil in the distributor / coil?

Or could something else be causing my stalling?

Mike Darrett

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Old 24 Mar 2006, 07:16 pm   #2 (permalink)
qslim
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Default Re: 96 camry stalling... hmm...

Problems like these are THE hardest to diagnose. I tell customers with
these problems that the best chance of figuring out what is wrong occurs
if the car has to be brought in on a flat bed. It's tough to diagnose what
was at fault 20 minutes ago but is now working fine.
Anyway, the dist o-ring is to keep oil from leaking out of the head,
not into the distributor, so no worries there. Most of these idle stalling
problems on your car we see are related to the IAC. The IAC, however, will
make your car stall outright as it immediately cuts off air to the engine.

Your description of 'rpm drop' without stalling makes me think it may be
a temp sensor on its way out. When they go bad they tell the computer the
temperature is about -40F, so it goes into open loop mode and richens the
mixture to bring the engine up to temp. Doing this on an already hot
engine causes the symptoms you describe - rough running and stalling.
It'll do this on and off as it pleases until it poops completely.
Anyway, that's what I would guess. We see that from time to time on your
vintage camry. A new sensor is about 50 bucks or so, and it's as simple as
replacing a light bulb.


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Old 25 Mar 2006, 02:05 am   #3 (permalink)
mrdarrett@gmail.com
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Default Re: 96 camry stalling... hmm...


qslim wrote:
> Problems like these are THE hardest to diagnose. I tell customers with
> these problems that the best chance of figuring out what is wrong occurs
> if the car has to be brought in on a flat bed. It's tough to diagnose what
> was at fault 20 minutes ago but is now working fine.
> Anyway, the dist o-ring is to keep oil from leaking out of the head,
> not into the distributor, so no worries there. Most of these idle stalling
> problems on your car we see are related to the IAC. The IAC, however, will
> make your car stall outright as it immediately cuts off air to the engine.
>
> Your description of 'rpm drop' without stalling makes me think it may be
> a temp sensor on its way out. When they go bad they tell the computer the
> temperature is about -40F, so it goes into open loop mode and richens the
> mixture to bring the engine up to temp. Doing this on an already hot
> engine causes the symptoms you describe - rough running and stalling.
> It'll do this on and off as it pleases until it poops completely.
> Anyway, that's what I would guess. We see that from time to time on your
> vintage camry. A new sensor is about 50 bucks or so, and it's as simple as
> replacing a light bulb.



Well this is interesting news! When my camry stalls, it seems to vary
the rpm from 100 rpm to maybe 600 rpm, going up, down, up, down, then
stalling, unless I tap the gas while in neutral.

So, temperature sensor... how many are there? Where?

Thanks,

Mike

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Old 25 Mar 2006, 11:43 am   #4 (permalink)
qslim
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Default Re: 96 camry stalling... hmm...

Well, a bouncing idle like you describe is a symptom of an IAC problem
rather than the ECT. The ECT just makes the thing run like crap until it
stalls. This is what I was saying about difficulties diagnosing things
that happen every month or so - the only thing you can really do is make a
good guess and throw a part on there.
Anyway, the ECT is on the left side of the head at the upper hose
junction on the 5SFe and on the bottom of the radiator on the 1MZFe

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Old 25 Mar 2006, 02:13 pm   #5 (permalink)
m Ransley
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Default Re: 96 camry stalling... hmm...

Oil on the coil from the O ring leaking is camrys downfall, Cleaning the
coil with alcohol is a 10 minute job that helped me, it may not help you
but is easy to do and worth a try. It could be bad gas, a vacume leak,
many things. If it happens in rainy-humid weather it could be the coil.

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Old 26 Mar 2006, 12:37 am   #6 (permalink)
mrdarrett@gmail.com
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Default Re: 96 camry stalling... hmm...


m Ransley wrote:
> Oil on the coil from the O ring leaking is camrys downfall, Cleaning the
> coil with alcohol is a 10 minute job that helped me, it may not help you
> but is easy to do and worth a try. It could be bad gas, a vacume leak,
> many things. If it happens in rainy-humid weather it could be the coil.


Is the coil built-in to the distributor cap...?

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Old 26 Mar 2006, 07:36 am   #7 (permalink)
m Ransley
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Default Re: 96 camry stalling... hmm...

It is under the cap on the distributor, problem is to remove the coil
you need to pull the distributor. A loose cap can also be a problem, my
mechanic left mine loose twice trying to figure out my stalling issue,
and never figured out the "oiled dirty coil" issue. All older Camrys
with coil under cap get this issue, It is a poor design issue.

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Old 03 Apr 2006, 06:21 pm   #8 (permalink)
Tom Borja
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Default Re: 96 camry stalling... hmm...

mrdarrett@gmail.com wrote in
news:1143242141.278163.144850@i39g2000cwa.googlegr oups.com:

> Ok, here's the situation. Maybe once a month, when stopped at a stop
> sign or stop light, my '96 camry will suddenly drop in RPMs.
> Sometimes, if I quickly shift to neutral then tap the gas, this will
> rescue it. Other times, the car stalls outright, and needs to be
> restarted (but is usually fine after that).


If after a ride on an expressway and the car is warmed up, you come to a
stop at a stoplight or something, and then the engine stutters or stalls,
then this is a classic symptom of a bad EGR valve -much known to go out on
90's Camrys (as it did on my 96 Camry). A fix at a dealer will be about
$330 -probably less at a private garage.
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Old 03 Apr 2006, 06:38 pm   #9 (permalink)
onehappymadman@yahoo.com
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Default Re: 96 camry stalling... hmm...


Tom Borja wrote:
> mrdarrett@gmail.com wrote in
> news:1143242141.278163.144850@i39g2000cwa.googlegr oups.com:
>
> > Ok, here's the situation. Maybe once a month, when stopped at a stop
> > sign or stop light, my '96 camry will suddenly drop in RPMs.
> > Sometimes, if I quickly shift to neutral then tap the gas, this will
> > rescue it. Other times, the car stalls outright, and needs to be
> > restarted (but is usually fine after that).

>
> If after a ride on an expressway and the car is warmed up, you come to a
> stop at a stoplight or something, and then the engine stutters or stalls,
> then this is a classic symptom of a bad EGR valve -much known to go out on
> 90's Camrys (as it did on my 96 Camry). A fix at a dealer will be about
> $330 -probably less at a private garage.



Yes, I'm focusing on the EGR now.

EGR valve or modulator?

The Haynes doesn't give a very good description on how to remove the
EGR valve or modulator... the valve seems held down by a sturdy piece
of metal (two nuts)... the modulator seems like it's held down by
*something* underneath it (removed the three small rubber hoses, tried
to remove it from the clamp, and still won't move.)

In the meantime, I found two "scorch marks" in my EGR filter... the
filter nearly fell apart in my hands into three layers. I discarded
the rough layer with the scorch marks (saved it in case I need it
later) and placed the other two layers back in the filter housing...
planning on cleaning the EGR modulator (if I can get it out!) with
solvent and a can of compressed air I bought in the electronics aisle
at Wal-Mart...

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Old 03 Apr 2006, 06:48 pm   #10 (permalink)
Tom Borja
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Default Re: 96 camry stalling... hmm...

onehappymadman@yahoo.com wrote in
news:1144107502.422577.224150@u72g2000cwu.googlegr oups.com:

>
> Tom Borja wrote:
>> mrdarrett@gmail.com wrote in
>> news:1143242141.278163.144850@i39g2000cwa.googlegr oups.com:
>>
>> > Ok, here's the situation. Maybe once a month, when stopped at a
>> > stop sign or stop light, my '96 camry will suddenly drop in RPMs.
>> > Sometimes, if I quickly shift to neutral then tap the gas, this
>> > will rescue it. Other times, the car stalls outright, and needs to
>> > be restarted (but is usually fine after that).

>>
>> If after a ride on an expressway and the car is warmed up, you come
>> to a stop at a stoplight or something, and then the engine stutters
>> or stalls, then this is a classic symptom of a bad EGR valve -much
>> known to go out on 90's Camrys (as it did on my 96 Camry). A fix at a
>> dealer will be about $330 -probably less at a private garage.

>
>
> Yes, I'm focusing on the EGR now.
>
> EGR valve or modulator?
>
> The Haynes doesn't give a very good description on how to remove the
> EGR valve or modulator... the valve seems held down by a sturdy piece
> of metal (two nuts)... the modulator seems like it's held down by
> *something* underneath it (removed the three small rubber hoses, tried
> to remove it from the clamp, and still won't move.)
>
> In the meantime, I found two "scorch marks" in my EGR filter... the
> filter nearly fell apart in my hands into three layers. I discarded
> the rough layer with the scorch marks (saved it in case I need it
> later) and placed the other two layers back in the filter housing...
> planning on cleaning the EGR modulator (if I can get it out!) with
> solvent and a can of compressed air I bought in the electronics aisle
> at Wal-Mart...


Sorry, couldn't tell you if it's the valve or modulator (I'm an extreme
novice). All's I know is my dealer told me it was the valve they replaced
on my Camry.
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