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Discussion Starter #1
I have an intermittent problem with my 1992 Toyota Camry (4-cylinder
engine). The problem always occurs when I try to start the engine while
the engine is hot. Typically I drove the car for more than 20 minutes,
stopped the engine, went into a store to buy something (taking about 10-15
minutes), and got back to the car. I was able to start the engine, but
immediately it stalled. Then, I could no longer start the engine until I
waited long enough (about 20 minutes or more) for the engine to cool
down.
The Check Engine light was never lit, and I have no engine problems at all
while I am driving. The problem only occurs when I try to start a hot
engine.
I have had this problem since 1.5 years ago, and have replaced fuel pump,
thermostat, and spark plugs, but the problem persists. It occurred more
often in the summer, but also occurred recently.
Sometimes in order to cool the engine faster, I sprayed water mist onto
the engine. Is it O.K. to do so? I also tried different brands of
gasoline, but it did not help.
A Toyota dealer Service Adviser suggested 3 possible causes: 1) thermal
valve malfunction, 2) idle speed control (ISC) having some rubber part
becoming sticky, and 3) ignition coil broken. Where is the thermal valve,
and how can I check it? By the way, I have a Repair Manual published by
Toyota.
Does anybody have any suggestions? The dealer told me checking each
possible cause would cost me several hundred dollars and there would be no
guarantee that replacing the part(s) would solve the problem.
 
J
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Discussion Starter #2
check www.autozone.com for free online manual for your car. It should
tell you how to inspect the various components.

For a decade after your car Toyota continued to struggle with sticking
idle air control (IAC) valve. So do a search on the web to find out
more about how to clean this. Toyota ended up giving the valve away for
those who let them charge $150 or so for labor (don't know if still
applies).

A faulty IAC valve doesn't allow enough air to enter the engine at idle
and will cause the engine to stall. However, if you manually hold the
throttle open and the problem disappears, then you've pretty much
narrowed it down that much. (Then you'll be the IAC valve for a while).
 
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Discussion Starter #3
Thermal valve malfunction?
Would guess they mean the coolant temperature sensor.
Located near the distributor in the water outlet. Haynes repair manual
for under $20 will show you how to check it with a digital multimeter.
The usual cause for them to malfunction I suspect, is old coolant
mixture causing corrosion.
Idle speed control?
Idle speed is governed by the ECM (computer) which rarely - almost
never go bad. There is an idle control valve (IAC - idle air control)
which meters air flow past the closed throttle valve at idle governed
by the ECM, but in my experience, they tend to show problems with a
cold engine. A short spray of TriFlow in the rectangular hole at the
bottom of the front of the throttle body is accessible with removal of
one bolt clamping the large black air hose.
Ignition coil broken?
If you have the non California version with the coil inside the
distributor I would check this first. Often reported as a problem, and
could well be showing up only when hot. Haynes manual gives the
resistance specifications to check the primary and secondary windings
for resistance.
Also, the factory service manual is available online at:
http://www.turboninjas.com/camry/
 
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Discussion Starter #4
Daniel wrote:
> Thermal valve malfunction?
> Would guess they mean the coolant temperature sensor.
> Located near the distributor in the water outlet. Haynes repair manual
> for under $20 will show you how to check it with a digital multimeter.
> The usual cause for them to malfunction I suspect, is old coolant
> mixture causing corrosion.
> Idle speed control?
> Idle speed is governed by the ECM (computer) which rarely - almost
> never go bad. There is an idle control valve (IAC - idle air control)
> which meters air flow past the closed throttle valve at idle governed
> by the ECM, but in my experience, they tend to show problems with a
> cold engine. A short spray of TriFlow in the rectangular hole at the
> bottom of the front of the throttle body is accessible with removal of
> one bolt clamping the large black air hose.
> Ignition coil broken?
> If you have the non California version with the coil inside the
> distributor I would check this first. Often reported as a problem, and
> could well be showing up only when hot. Haynes manual gives the
> resistance specifications to check the primary and secondary windings
> for resistance.
> Also, the factory service manual is available online at:
> http://www.turboninjas.com/camry/


Thanks, Daniel! That's a great link.
 
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