TPS and IAC problem
Thread Starter
Cruising
Joined: Jun 2017
Posts: 12
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TPS and IAC problem
First off im new here and ive been a mustang guy for years..I bought a 84 vette with a few problems..Here is whats going on..Two main things i need help with..Neither of The IACs are functioning..I replaced one of them with a new AC Delco but made know difference..I set plunger to 1.125 but it doesnt move at all..Checked continuity between both IAC connecters and that was good..Question is do the IACs only work in series so if one is bad will that stop both from functioning.?..Second question is my TPS shows 3-4 volts all the time..I tried adjusting to .54 volts off two top wires but voltage will not budge..Any thoughts on this??
thanx in advance
thanx in advance
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The ECM resets the IAC every time you turn on the ignition. You don't have to "set" it to anything. I always push the plunger in as far as it will go. The only thing to watch for is to not leave the plunger sticking out too far. If you do that the plunger guide will get broken when the IAC is screwed in.
That would happen if the ground is missing. That could be caused by a corroded connector pin or broken wire. Sometimes the wire breaks inside the insulation so you can't see. Use a volt/ohm/milliammeter to measure the wires to make sure they are making a connection.
That would happen if the ground is missing. That could be caused by a corroded connector pin or broken wire. Sometimes the wire breaks inside the insulation so you can't see. Use a volt/ohm/milliammeter to measure the wires to make sure they are making a connection.
Last edited by Cliff Harris; Jul 3, 2017 at 03:03 AM. Reason: Clarified wording.
