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2002 Van is missing, back firing, won't stay running. Already replaced tps,idle air control valve. What else could it be?

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Check the crankshaft sensor and fuel pump pressure

Posted on Feb 10, 2014

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SOURCE: Idles bad

Sounds like you may have an upper intake manifold leak. Typically the gasket between the Plenum and the lower intake dries up and gets sucked into the intake a little causing a leak and a high idle issue. The repair requires the removal of the plenum and replacement of the gasket. NOTE: there is a torx bolt hidden between the center plenum runners and can only be seen by looking straight down at the top of the plenum and it may be covered in dirt. If you have to use a bar to pry off the plenum you probably have missed a bolt. Typically it is the one noted above. Best of luck.

Posted on Mar 22, 2009

csmock132
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SOURCE: 87 chevy truck with TBI idles too fast

Spray the intake with carb cleaner to find the vacuum leak. Check where the EGR mounts and the throttle body gasket sense you had both off.

Posted on May 10, 2009

keithheavili
  • 410 Answers

SOURCE: Trying to locate the idle air control valve on Toyota Sienna Van

You idle air control valve should be located on the throttle body.  Here is a link to a picture of it so you can see what you are looking for:  http://www.autozone.com/autozone/catalog/parts/partsShelf.jsp?categoryDisplayName=Engine+Management&fromType=parts&fromString=search&parentId=cat30067&currentPage=1&filterByKeyWord=IAC&isSearchByPartNumber=false&navValue=15900207&categoryNValue=15999999&fromWhere=&itemId=prod61721&displayName=Idle+Air+Control+Valve&searchText=IAC Let me know if you have any other questions.  Thanks for rating my response and for using FixYa!

Posted on May 28, 2009

  • 1071 Answers

SOURCE: idle air control system failure

vacuum leaks

Posted on Jul 29, 2009

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SOURCE: I have 2002 dodge stratus, replaced timing

sounds like plugged catalytic converter for the exhaust... have it ckd out

Posted on Aug 08, 2009

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2 Answers

Why won't my 2002 Toyota Sienna idle on it's own? I have replaced the Throttle Positioning Sensor already.


Clean the IAC motor and inside the throttle body. This will fix your problem.

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Unless the vac leak is very large, it would not keep the engine from idling.
The computer controls idle speed by regulating how much air enters the intake thru the throttle body by use of the idle air control valve.
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Throttle body removed and replaced


I'm not a chevy guy, but I think you need to reset the throttle position sensor (TPS) once it's disconnected.

For idle, the throttle plate is almost closed with just a little air getting through. For more air, an IAC idle air control valve lets more air in to maintain an ilde speed. The TPS tells the engine computer when the throttle plate is closed and then the computer tells the IAC to let more or less air in to maintain idle.

So, as long as you reconnected all the connectors you took off, I'm guessing you just need to make some readjustments. Calling your Chevy dealer service department, they can tell you if that's true.

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