Toyota Camry: Throttle Body

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"TObject" <com> wrote in message
news:32ee3$400edefa$4069520e$meganewsservers.com.. . 
handle, 

"TObject" <com> wrote in message news:<32ee3$400edefa$4069520e$meganewsservers.com> ... 

Don't be so quick to replace the throttle body.
I've had a very similar situation with my '97 camry, the car would
start but die immediatly, or start and idle very slow. Hitting the
throttle body lightly with a screwdriver handle cleared the problem
temporarily.
I suspected 2 systems:
1.) the EGR valve stuck open(Or part open).
2.) the Idle Air Control Valve.
I was able to rule out the EGR valve.
I posted the problem on http://groups.yahoo.com/group/Toyotas_only,
and followed the response-clean the Idle Air Control valve.
To access the valve, Remove the air intake hose from the throttle
body, you will see a square opening(hole) in front of the throttle
plate, Spray your intake cleaner into it, hopfully this will free it
up. it worked for me.
Hope this helps.
JerryR

"TObject" <com> wrote in message news:<32ee3$400edefa$4069520e$meganewsservers.com> ... 

Try this:
Let the engine idle when cold and the throttle body has not been
tapped, so the idle is not right.
This means the idle air control valve is sticking.
Spray your cleaner into the rectangular hole near the bottom just
right of center, while keeping the engine running by moving the
butterfly valve at the throttle body.
This should last a lot longer and prove satisfactory.
If not, you want to replace the IAC valve, not the entire throttle
body, but if it has not been harmed by "tapping" on it, cleaning
should work.
You also might want to check out:
http://www.redlineoil.com/redlineoil/si1ti.htm
reading the part about helping clean emission control components, and
make sure the PCV valve is clear.
Supposedly, oil fumes venting from the crankcase to the throttle body,
help clog the idle control valve, so even if you replace it with new,
the problem can return later.
Mine was starting to need cleaning pretty regularly, too, but after
cleaning while idling, (so far) it had lasted a _ lot _ longer.

"Daniel M. Dreifus" wrote:
 

I am curious about how a fuel additive would help clean the IAC or PCV? The IAC is located in the throttle body. The fuel is
injected down stream from this, just before the intake valves. The PCV valve only sees stuff from the crankcase. I suppose some of
a fuel system cleaner might work its way into the crankcase, but I can't see where an effective amount would every make it to the
PCV valve.

My opinion (and it is only an opinion) is that IACs are clogged by contamination introduced into the intake tract by the PCV
system. I can see where a better quality oil might have an effect (or it might not), but I have a hard time believing a fuel
additive will have a significant effect on the IAC or the throttle body.

Regards,

Ed White

"C. E. White" <com> wrote in message news:<com>... 

-- entering into the realm of conjecture here --
All I know for sure, is that the IAC stays cleaner longer when sprayed
with the engine idling. Since I also use the CFSC (Red Line), thought
that may have been a contributing factor also. (By the way, Gave a
bottle to a relative with a RAV4 for Christmas, and he commented
yesterday he was slightly amazed he could actually feel an immediate
improvement)
From their site:
"The detergents used survive the combustion process and clean the PCV
valve and the EGR port as well as cleaning deposits in the combustion
chamber."
Once again, conjecture on my part: Isn't crankcase pressure vented by
the PCV valve generated through "blowby" from the combustion chamber?
If so, it seems the fuel cleaner surviving the combustion process is
vented through the PCV valve into the throttle body.

In news:com,
C. E. White <com> being of bellicose mind posted: 

Lets define "upstream" as the intake tract from the air filter to the
throttle body.

Let's define "downstream" as the intake tract from the throttle body to
the intake valves.

EGR introduces exhaust gases and fluffy carbon "downstream." So unless
the EGR entrance is immediately underneath the throttle plate, you won't
get deposits fouling the throttle body.

The PCV system has TWO connecting points to the intake tract. The
downstream point (where the PCV valve is located) will introduce
deposits "downstream" well below the throttle plate. The other PCV
connecting point is locate "upstream." Now... under some conditions
(full throttle and blocked PCV valve), all crankcase vapor will reverse
normal flow and enter the intake tract "upstream." If this condition is
prevalent, the throttle body and IAC circuit will get fouled by blowby
gasses.

Nothing you put in the gasoline will affect the above. Fuel is injected
after the throttle body and right before the intake valves. Not
allowing engine oil to become excessively contaminated will minimize any
deposits on the intake tract walls.

Cleaning a throttle body should NEVER be done on the car with a running
engine. Both the aerosol cleaner and the deposits removed can foul the
O2 sensor(s). BE sure to use a cleaner that is safe for throttle
position sensors. Same thing goes for PCV valves. Remove it from the
engine for proper cleaning.
--

- Philip

"It's no longer a question of staying healthy.
It's a question of finding a sickness you like."
-Jackie Mason