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Toyota hi ace 1996 2 litre 1rze problem Hi idle speed no fault codes coming up on scanning

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Using a vacuum gauge attached to the intake vacuum port engine running,
look for a air vacuum leak.
too much air coming into the engine= high idle speed it usually doesn't set a code
unless it gets bad.

Posted on Jul 23, 2010

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Posted on Jan 02, 2017

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Hi I have 2003 Toyota voxy it have a 1az fse engine problem is loss of power ,low idle ,sometimes misfiring and when turn on a/c its keeps idling up and down,already scan engine nothing have shown up.


there will be faults so have the faults read by a professional with experience on your engine
all of what you describe will leave fault codes

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If Short term # is high while underway, but normal while idling, you could have a scewed maf signal. Sometimes cleaning maf with carb cleaner helps. If no intake leaks are found, and fuel pressure and volume are ok, it could be maf sensor.

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Hi idle speed for 2001 silverado


The first thing you need to do is to scan your onboard computer network for fault codes. The idle speed is controlled by the computer via the Idle Air Control (IAC) valve. Which is a pulse-width modulated electric motor. If the Powertrain Control Module (PCM) cannot control the idle speed correctly, your check engine light should be coming on (this should be your first clue to get it scanned) and there will be fault codes stored that will be helpful in identifying the cause of the problem. It could be several different causes including a failed IAC, damaged or corroded wire connectors, damaged wiring (rodent damage is pretty common), or even a failed PCM.

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Proper diagnosis and system testing would be required before I could advise you with any accuracy about any definite "fix" for your problem.

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If engine revolutions are going up and down even when you are driving, then you have a problem with the EGR valve.

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If the check engine light is on then it can be a faulty sensor somewhere. We won't know until you take it in for an engine scan. On the engine scanner it will list fault codes and by then you'll know what sensor needs replacement.

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THESE ARE FROM THE GM CODE DIFINITION MANUAL, U NEED TO TAKE THIS TO THE DELAER, U HAVE SOME SERIOUS PROBLEMS TO GIVE THIS MANY CODES.

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