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Discussion Starter · #1 ·
1993 Toy 2wd 22re 5sp 210,000 mi.

Suddenly I have no fast idle when cold. Any ideas what to look for?

I'd like to know how the fast idle system works. I assume there is a
heat operated vacuum valve that opens a diaphragm to let more air into
the manifold. Is that correct?

Q
 
G

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Discussion Starter · #2 ·
On Tue, 27 Dec 2005 22:47:19 GMT, Q <[email protected]>
wrote:

>1993 Toy 2wd 22re 5sp 210,000 mi.
>
>Suddenly I have no fast idle when cold. Any ideas what to look for?
>
>I'd like to know how the fast idle system works. I assume there is a
>heat operated vacuum valve that opens a diaphragm to let more air into
>the manifold. Is that correct?
>


it starts but no fast idle?
i confess i don't know how the system works but i think there's a
cold start injector to richen things up and the rest of the system
ups the idle speed to compensate for the extra fuel.
 
G

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Discussion Starter · #3 ·
Jeb,

Yes, my understanding is that there is a cold start injector, which
appears to be working. I tested it by unplugging the cold start thermal
switch which made it very difficult or impossible to start when cold.
Plugging it back in made it start fine but I have to keep my foot on the
throttle to keep it running fast enough so it doesn't die. Once warmed
up for a couple minutes, the idle is fine. The problem appears to be
with whatever device is supposed to let more air into the manifold.

Looking under the manifold I see a diaphragm with a vacuum hose going to
it (not the EGRV). I think that may be what is supposed to let in extra
air. Anyway I've ordered a shop manual which I assume will have the
diagnostic procedures.

Q

JeB wrote:
> On Tue, 27 Dec 2005 22:47:19 GMT, Q <[email protected]>
> wrote:
>
>
>>1993 Toy 2wd 22re 5sp 210,000 mi.
>>
>>Suddenly I have no fast idle when cold. Any ideas what to look for?
>>
>>I'd like to know how the fast idle system works. I assume there is a
>>heat operated vacuum valve that opens a diaphragm to let more air into
>>the manifold. Is that correct?
>>

>
>
> it starts but no fast idle?
> i confess i don't know how the system works but i think there's a
> cold start injector to richen things up and the rest of the system
> ups the idle speed to compensate for the extra fuel.
>
>
 
G

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Discussion Starter · #4 ·
Do you have Fuel injection or carburetor ?
If it's carburetor it works off a choke.
The choke regulates the position of the butterfly in the carb.Check on
the web on how to regulate.Good Luck.
 
G

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Discussion Starter · #5 ·
It's a 93 which is fuel injected. If it had a carb, I would know how to
fix it.

Q

W.T. MC GLYNN wrote:
> Do you have Fuel injection or carburetor ?
> If it's carburetor it works off a choke.
> The choke regulates the position of the butterfly in the carb.Check on
> the web on how to regulate.Good Luck.
>
 
G

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Discussion Starter · #6 ·
G

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Discussion Starter · #7 ·
Thanks Keyser,

I've tested and adjusted the TPS and it's working fine. The TPS doesn't
controll the fast idle when cold.

Q

Keyser Soze wrote:
> "Q" <[email protected]> wrote in message
> news:[email protected]
>
>>It's a 93 which is fuel injected. If it had a carb, I would know how to
>>fix it.
>>
>>Q
>>
>>W.T. MC GLYNN wrote:
>>
>>>Do you have Fuel injection or carburetor ?
>>>If it's carburetor it works off a choke.
>>>The choke regulates the position of the butterfly in the carb.Check on
>>>the web on how to regulate.Good Luck.
>>>

>
> Some useful information:
> http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml#ThrottlePositionSensor
>
>
 
G

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Discussion Starter · #8 ·
"Q" <[email protected]> wrote in message
news:[email protected]
> Thanks Keyser,
>
> I've tested and adjusted the TPS and it's working fine. The TPS doesn't
> controll the fast idle when cold.
>
> Q
>
> Keyser Soze wrote:
>> "Q" <[email protected]> wrote in message
>> news:[email protected]
>>
>>>It's a 93 which is fuel injected. If it had a carb, I would know how to
>>>fix it.
>>>
>>>Q
>>>
>>>W.T. MC GLYNN wrote:
>>>
>>>>Do you have Fuel injection or carburetor ?
>>>>If it's carburetor it works off a choke.
>>>>The choke regulates the position of the butterfly in the carb.Check on
>>>>the web on how to regulate.Good Luck.
>>>>

>>
>> Some useful information:
>> http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml#ThrottlePositionSensor

Well here's another link:
http://autorepair.about.com/library/faqs/bl524g.htm
 
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Discussion Starter · #9 ·
Hi Q
I am not familiar with your model, there will be an idle
compensation valve fitted to the inlet manifold this is the first place to
check they usually carbon up but can be genuanly faulty.
Joe



"Q" <[email protected]> wrote in message
news:[email protected]
> 1993 Toy 2wd 22re 5sp 210,000 mi.
>
> Suddenly I have no fast idle when cold. Any ideas what to look for?
>
> I'd like to know how the fast idle system works. I assume there is a heat
> operated vacuum valve that opens a diaphragm to let more air into the
> manifold. Is that correct?
>
> Q
 
G

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Discussion Starter · #10 ·
Thanks Joe,

You're right. I just fixed it yesterday. The device is basically a
thermostat that is heated with coolant from the engine. It opens an air
passage in the throttle valve assembly, letting air past the butterfly
valve. When I cleaned out the throttle assembly the other day I
tightened the locking ring in place, not realizing it is for adjusting
the valve. I removed the assembly, put it in a pot of hot water on the
stove and observed it's operation. After adjusting it, all is well.

Q

Joe wrote:
> Hi Q
> I am not familiar with your model, there will be an idle
> compensation valve fitted to the inlet manifold this is the first place to
> check they usually carbon up but can be genuanly faulty.
> Joe
 
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