No high idle at cold start

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Ed White - 17 Sep 2007 21:07 GMT

Hi all,
I just got done replacing the cylinder head on our 1993 Camry w/2.2 Liter 4
cyl, a/c, auto, and it has one issue that was not there before, after a cold
start it does not go to high idle, it stumbles for a few minutes till it's
warm, then runs great.
I had to disassemble the whole top end of the engine including lots of
wiring and vacuum lines, I believe they are all re-connected properly,
but.........???
I'm a mechanic by trade (truck equipment, not cars), and my manual is not
much help as far as vacuum hose routing.
I would also be interested to read any fault codes, is there a way to do
this without a scanner? It might give up a clue.....
Also, tucked up behind the intake manifold, there is some sort of black
plastic valve, has 2 vacuum hoses and a wiring connector, I'm not 100% sure
that is as it should be.
Thanks in advance, any help appreciated.

Ed White

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Nobody Important - 17 Sep 2007 23:54 GMT

> Hi all,
> I just got done replacing the cylinder head on our 1993 Camry w/2.2 Liter 4
[quoted text clipped - 14 lines]
>
> Ed White

Hi Ed,

I think the factory service manual for your car is online at
camrymanuals.com . Yours is a Gen 3 Camry.

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Daniel - 18 Sep 2007 01:42 GMT

> Hi all,
> I just got done replacing the cylinder head on our 1993 Camry w/2.2 Liter 4
[quoted text clipped - 4 lines]
> wiring and vacuum lines, I believe they are all re-connected properly,
> but.........???

==
There is no vacuum hose wiring for the idle control valve.
Inside the valve are ports which allow air to bypass the closed
throttle valve.
The signals are computer generated to monitor preset idle speed
target.
Usually stumble on cold start means the valve is sticking.
You could try spraying lubricant or solvent into the rectangular inlet
opening at the bottom of the throttle body right in front, or replace
the valve.
The likely cause could just be a poor electrical connection if it
worked fine before.
Try unplugging the connector, cleaning if necessary, or just unplug,
re plug to see if you can get better electrical contact. Sometimes
that area gets grimy, especially if you haven't replaced the
distributor O ring which is nearby. By now it's most likely as brittle
as a piece of porcelain.

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