Engine in, idles to fast

[TurboDave]

That means nothing without the IAC and TPS values.

 

[Sweet6]

My interpretation of closed throttle body was 100% closed with 0 air going through the TB

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[we4Mateo]

My interpretation of closed throttle body was 100% closed with 0 air going through the TB

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It's never fully closed.

 

[Sweet6]

Ok that was how I found my problem with the EGR letting air in. I capped the TB and it still idled high So start eliminating things until you narrow it down

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[Sweet6]

I turned the throttle blade to pretty much being 100% closed Then I put my hand over the TB to be 100% sure it was closed

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[rank]

Start the car and start spraying carb cleaner all over every connection, mating surface. Everywhere. The engine stumbles, there's your leak. If its present not under load.

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[rank]

That's the first thing I'm gonna do when I get back in the shop

 

[earlbrown]

You can back the throttle blade off until it physically sticks in the bore at rest.

but one lumpy piece of carbon/crud on the IAC pintle/seat can cause a high idle situation. With a scan tool you'd notice it would be reading "00" as the ECM is trying to bring the idle down.

 

[Sweet6]

I took my TPS apart too! I did the tps and iac checks first I did all of the basics and then eliminated from there In the end I found the problem

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[turbodave231]

The TPS can still be misadjusted with the throttle blade 100% closed..............and You can read tps voltage with a voltmeter and a safety pin. No scan tool needed.

A vacuum leak is certainly a possibility. But on a new engine install, you need to set minimum air rate and reset TPS.

 

[notacarlo]

The TPS can still be misadjusted with the throttle blade 100% closed..............and You can read tps voltage with a voltmeter and a safety pin. No scan tool needed.

A vacuum leak is certainly a possibility. But on a new engine install, you need to set minimum air rate and reset TPS.

Agreed. The new engine install is what leans me toward a breach in the ducting. Simple as someone not tightening something correctly or as complicated as not checking electronics parameters.

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