Why does this engine want to idle at 1500RPM

[sparkinak]

Ill have to try hose deal tomorrow

On the tb it does not go any further back than where its at. The butterfly is closed with no gaps showing in the throttle body bore. Im still leaning towards iac after last test you had me do.

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[sparkinak]

Ok, blocked pcv hose on tb and no change.

I had him redo the IAC test joecar said to do and this is his response.

Does weird shit. Not sure. It will idle way down almost to do doe but idles low. Then idles up high, and as I move my thumb it changes nothing consistent

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[joecar]

...

Does weird shit. Not sure. It will idle way down almost to do doe but idles low. Then idles up high, and as I move my thumb it changes nothing consistent

...

You have to pull the IACV out of the TB and look closely at the passages to follow where they go... and check that the IACV pintle matches up to the shape in the bore.

Also, check for gasket leak between TB and manifold.

[sparkinak]

Copy, im going to the shop tonight, didnt have a chance yesterday. And I will thuroughly look that flipping thing over. I did find the right IAC for it and delco along with gm part number. It has to be the 2000 to 2002 IAC from a firebird to make it easy

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[sparkinak]

I'm trying to figure out if the tune caused the line pressure to be calculated low (which causes slipping)

( basically, in the PCM: low airmass calculation -> low torque calculation -> low line pressure calculation )

So once I figure vacuum leak out, where can I go to look this info up so it will make sense to me. The trans now is built up with a 3900 stall torq. Shift kit blah blah. I dont want to dial motor in thinking im set and smoke the tranny.

[joecar]

So once I figure vacuum leak out, where can I go to look this info up so it will make sense to me. The trans now is built up with a 3900 stall torq. Shift kit blah blah. I dont want to dial motor in thinking im set and smoke the tranny.

You have to keep an eye on the pid GM.TRQENG and on line pressure using a gauge on the line tap on the side of the case.

[sparkinak]

Busy weekend so didnt get to play on truck as much as i liked. Something about the IAC kept bugging me so I pulled it out, connector plugged in and then switched the key on. Iac extended about .25 inch. Looked at the oring and there was a slight gash in it. Not cut but just a part missing. Key off put the oring in the bore first, then installed iac and started it. Same thing but not. In stead of bam 1500 it slowly came up say 800 then 900 1000 1100 etc. I decided to just order a iac just to cross that off the possible list 100%.

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