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Idle control valve gets hot and will not start

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bogdanodwazn
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SOURCE: 2003 toyota corolla, shakes in the morning, stops shaking after it gets hot. I clean the idle control valve, the voltage signal from computer to the idle control valve is 5.1v.What should it be?

Have you done tune up? fuel filter?

Posted on Mar 16, 2017

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2 Answers

Tick over too slow. Idle speed.


bad battery or bad starter .

Aug 11, 2015 | 2010 Suzuki Splash 1.2

1 Answer

Loud idle running hot in park but not in drive


double posted
post RPM in both modes,
it must be the same
the ISC idle controls system controls idle at all times.
post RPM. 800 is normal. the exact valve is in the FSM
and posted under the hood in USA.
no country stated in 4000s posts so.... well, gee....
here, open the hood, look up, see EPA vacuum map
that is also the the engine size and type , and most state the normal
hot RPM clearly there, and is in the FSM.

here is the acid test. hot.
in park hot, rpm 800 if not the ISC fuction is dead
"idle speed controls"
good? yes.
then select drive. if RPM drops ISC is malfing.
now back to park. (all this is in the FSM to read)
now 800 hot. you turn on all heavy electrical loads
the rpm does not drop. Head lights + heater fan, and defrost.
all these test he ISC, if it fails its bad.
what does bad mean, that means its out of control
and you do further testing to find the reasons.

vast reasons.
Ill name 3:
intake air leaks. aka vacuum leaks.
ISC valve dirty , clean it.
throttle cables , misadjusted.
cold start air valve stuck open hot.





Nov 25, 2013 | 2006 Jeep Grand Cherokee

1 Answer

I have a 1998 toyota corolla fuel injection. when starting in the morning it does not idle until engine is hot.


This is a well known problem with your engine. The idle is controlled by the Idle Air Control Valve (IAC), which is driven by a little motor controlled by the car's computer. The valve is dirty and sticky. Once cleaned it should work fine. There is a lot on the Net about it, just Google Corolla Idle Air Control Valve

Oct 21, 2013 | Mazda MAZDA6 Cars & Trucks

1 Answer

High idle on cold start on a 86 dodge d50 2.0 liter


Feb 27, 2012 | 1986 Dodge Pickup 4WD

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98 dodge ram 1500 5.2 the truck will start but it will not idle.


Feb 21, 2012 | 1998 Dodge Ram 1500 4WD

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I have a Honda inspire 1992 my problem is the idle speed,when starting from cold it idles too slowly less than 800rpm no problems when engine is hot,where could this problem be comming from could it be one...


This must be an idle control valve. Try cleaning electric contacts. You could try removing, thoroughly cleaning it and grease it. If this doesn't help replace it.

Jul 11, 2011 | Honda Accord Cars & Trucks

1 Answer

When i am driving down the hwy at 60mph and in 5th gea it will cut off. If im slowng down in neutral it will cut off. It idols low in a stopped position. And it rattles. And sometimes when im driving the...


ok if you are runing on the fwy and let go the gas pedal the only air is coming in from the idle valve and on neutral the same ting what about wen you start the car first the rpm is high 1400 or 1500 then going down wen it get hot that car had two valves the cold idle valve and electric valve the electric valve control the regular idle wen the car is hot after the cold valve is closed

Dec 15, 2010 | 1992 Honda Accord

3 Answers

My daughter's 2003 Mazda Tribute sometimes won't stay running. It will start but when you take your foot off the gas it stalls. She's had it towed home and then it starts right up!


if when running it runs well apart from idle problem i would suggest you have the throttle body and idle speed control valve cleaned out and add a fuel system cleaner to fuel tank also check wireing to idle speed control valve

Dec 23, 2009 | 2003 Mazda Tribute

1 Answer

Idle too low on hot starts 2001 Avalon


Sounds like you idle air control valve is going bad. They start acting up on a hot engine due to sticking or high resistance through its internal windings. It will get to the point where the engine will stall every time you take your foot off the gas.
I suggest getting it replaced and the throttle body cleaned at the same time since it will need to be removed to replace the IAC.

Apr 09, 2009 | 2001 Toyota Avalon

1 Answer

Idle fluctuates


Its could be a few things. Most likely cause is you IAC (Idle air control valve) If this valve gets clogged up with carbon it will cause a idle surge on cold starts like you are describing.

Next your FITV (fast idle thermal valve). When the hot wax inside of this valve starts to wear it will cause a idle surge on cold starts.

Dec 13, 2008 | 1997 Acura CL

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