Is the procedure just to jump ALDL pins A/B with a paperclip and turn the key to on? Please correct me where I am wrong.

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84 Indy Pace car (2013-current)
86 SE (2012-2015)
88 Formula - Factory Yellow,
LA Machine convertible,
lowered, w/ 6.6 shaker hood, 1997 Daytona Speedway Spectacular trophy winner (1995-2000)

https://www.fiero.nl/forum/A...090907-2-090637.html

No. Above is Not really true but can try.
In fact 300 TBI needs a plug to reset idle stop screw.
See my Cave, Idle Stop

ECM is program to always resets IAC when car is driving over ~35 MPH.
If ECM is not setting code then IAC is likely fine.

(edit to fix cave links)
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

[This message has been edited by theogre (edited 08-21-2015).]

This actually worked well on my 300 TBI.

After installing a new IAC the engine had an INSANE idle and just barely touching the gas pedal sent it to redline. Engine threw a code - don't remember which one but it was an IAC code. After resetting as mentioned in that thread everything seemed to be fine.

Could a strip of aluminum foil tape accomplish a cheap alternative to a GM 1 time use specialty plug tool?

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84 Indy Pace car (2013-current)
86 SE (2012-2015)
88 Formula - Factory Yellow,
LA Machine convertible,
lowered, w/ 6.6 shaker hood, 1997 Daytona Speedway Spectacular trophy winner (1995-2000)

Note that any vacuum leaks can cause high idle. Messing w/ TBI and have a vac leak will give you big headaches.
See my Cave, Vac Leaks

The tool just seals the air bypass and is reusable. Try Google gm or Kent-Moore J-33047 for pictures. I think is "close cell" foam or silicon.

You could make anything to seal that hole. make sure you don't damage the TBI or get parts left behind and plugged the passage or bind up the IAC.

Again, You don't need to fool w/ this most cases because Driving will reset the IAC.
You often don't need to bother even changing TBI between engines or rebuild the TBI. (Because Many don't remove the throttle butterfly during rebuild.)

You can try jumping ALDL as said above but GM and others say nothing to reset 300 and 220 (uses 2 injectors for V8) this way. I have several FSM, Alldata, and others and found nothing said to reset IAC by jumping the ALDL. Is possible but official docs doesn't seem to have this.
(Related data... GM etc Books said 700 TBI does reset IAC w/o driving when ECM see throttle over ~2000rpm for xx seconds. You can see this happen on ECM scan tools.)

[This message has been edited by theogre (edited 08-21-2015).]

Thats a fantastic write up in the Ogre's cave. Thanks for writing it. A very valuable resource. Btw, I've read nearly everything in the cave. Btw we got it running. More about that in the original post about the Indy.

quote Originally posted by theogre: (...)I have several FSM, Alldata, and others and found nothing said to reset IAC by jumping the ALDL. Is possible but official docs doesn't seem to have this. (Related data... GM etc Books said 700 TBI does reset IAC w/o driving when ECM see throttle over ~2000rpm for xx seconds. You can see this happen on ECM scan tools.)

Didn't scan my 300 when doing this but it was over 3000 rpm at idle for a few minutes and I decided to reset it the way writen before and it worked. I don't know why it's not in any official documents.