How can I check the connector to the IAC itself to see if it's bad??
Thread Starter
Supreme Member
Joined: Dec 2000
Posts: 1,536
Likes: 0
From: Springfield, MO, USA
Car: 1986 Trans Am, 1991 Firebird
Engine: 355 TPI, 3.1L V6
Transmission: 700R4 in both
How can I check the connector to the IAC itself to see if it's bad??
I've come to the conclusion today that my IAC is non-functional and I was wondering if there was a way to check the connector itself to see if the wire(s) are bad. My connector is pretty fudged up and I'm wondering if maybe the wire is bad and not the IAC itself. Spending $40 on a new IAC and finding out it's the wires that way is really not my idea of fun.
------------------
1986 Trans AM
355 TPI
4 Wheel Disc Brakes
9 bolt Borg Warner Rear (2.77's....oh joy) :P
6" rods, approx. 9.7:1 Compression, Stock TPI (soon to be ported), 24#/hr LTI injectors (cleaned and flowmatched by Cruizin Performance), Hedman Shorty Headers, 3" exhaust with 80 series flowmaster, SBC 993 heads completely redone and modified for 1.6 RR, 1.52 RR (for now), Comp Cams XE262-14 TPI Cam, Holley AFPR, TPIS airfoil, MSD wires, MSD 6-AL Ignition, Hypertech 53,000 volt coil.
Track times to come.
------------------
1986 Trans AM
355 TPI
4 Wheel Disc Brakes
9 bolt Borg Warner Rear (2.77's....oh joy) :P
6" rods, approx. 9.7:1 Compression, Stock TPI (soon to be ported), 24#/hr LTI injectors (cleaned and flowmatched by Cruizin Performance), Hedman Shorty Headers, 3" exhaust with 80 series flowmaster, SBC 993 heads completely redone and modified for 1.6 RR, 1.52 RR (for now), Comp Cams XE262-14 TPI Cam, Holley AFPR, TPIS airfoil, MSD wires, MSD 6-AL Ignition, Hypertech 53,000 volt coil.
Track times to come.
Member
Joined: Jul 1999
Posts: 479
Likes: 1
From: Malden, Massachusetts, USA
Do you own a multimeter? Can you borrow one? The procedure is simple.
Set the meter to Ohms. Unplug your IAC sensor. Put one meter probe to the tip of the plug; maybe have a friend hold it there for you.
Go a few inches down the wire...actually, go as far along the wire as you can, until it starts to run into another harness or loom or whatever. Take the other probe from the meter, and poke it into the wire's insulation.
If the wire and plug are good, the meter will read 0 ohms. If the wire is broken or bad, you will get a very high reading, or no reading at all.
You could also rig this up with a self-powered test light, or a flashlight battery and a flashlight bulb.
Set the meter to Ohms. Unplug your IAC sensor. Put one meter probe to the tip of the plug; maybe have a friend hold it there for you.
Go a few inches down the wire...actually, go as far along the wire as you can, until it starts to run into another harness or loom or whatever. Take the other probe from the meter, and poke it into the wire's insulation.
If the wire and plug are good, the meter will read 0 ohms. If the wire is broken or bad, you will get a very high reading, or no reading at all.
You could also rig this up with a self-powered test light, or a flashlight battery and a flashlight bulb.
Thread Starter
Supreme Member
Joined: Dec 2000
Posts: 1,536
Likes: 0
From: Springfield, MO, USA
Car: 1986 Trans Am, 1991 Firebird
Engine: 355 TPI, 3.1L V6
Transmission: 700R4 in both
<font face="Verdana, Arial" size="2">Originally posted by Chris Luongo:
Do you own a multimeter? Can you borrow one? The procedure is simple.
Set the meter to Ohms. Unplug your IAC sensor. Put one meter probe to the tip of the plug; maybe have a friend hold it there for you.
Go a few inches down the wire...actually, go as far along the wire as you can, until it starts to run into another harness or loom or whatever. Take the other probe from the meter, and poke it into the wire's insulation.
If the wire and plug are good, the meter will read 0 ohms. If the wire is broken or bad, you will get a very high reading, or no reading at all.
You could also rig this up with a self-powered test light, or a flashlight battery and a flashlight bulb.</font>
Do you own a multimeter? Can you borrow one? The procedure is simple.
Set the meter to Ohms. Unplug your IAC sensor. Put one meter probe to the tip of the plug; maybe have a friend hold it there for you.
Go a few inches down the wire...actually, go as far along the wire as you can, until it starts to run into another harness or loom or whatever. Take the other probe from the meter, and poke it into the wire's insulation.
If the wire and plug are good, the meter will read 0 ohms. If the wire is broken or bad, you will get a very high reading, or no reading at all.
You could also rig this up with a self-powered test light, or a flashlight battery and a flashlight bulb.</font>
Thanks... I'll give that a shot.
------------------
1986 Trans AM
355 TPI
4 Wheel Disc Brakes
9 bolt Borg Warner Rear (2.77's....oh joy) :P
6" rods, approx. 9.7:1 Compression, Stock TPI (soon to be ported), 24#/hr LTI injectors (cleaned and flowmatched by Cruizin Performance), Hedman Shorty Headers, 3" exhaust with 80 series flowmaster, SBC 993 heads completely redone and modified for 1.6 RR, 1.52 RR (for now), Comp Cams XE262-14 TPI Cam, Holley AFPR, TPIS airfoil, MSD wires, MSD 6-AL Ignition, Hypertech 53,000 volt coil.
Track times to come.
Banned
Joined: Aug 2001
Posts: 246
Likes: 1
Or you could go to the local pepboys and get an IAC harness tester. It's a little device that plugs in the harness and little LEDS light up to tell you if the ECM is sending out the correct signals.
------------------
1992 Z28 5.7 TPI
ZZ4 longblock
Harland Sharp roller rockers
Accel base and SLP siamesed runners,
52MM SLP Throttle Body
Hooker Headers & Flowmaster catback
MSD6A ignition
aluminum driveshaft
World Class 5-speed
------------------
1992 Z28 5.7 TPI
ZZ4 longblock
Harland Sharp roller rockers
Accel base and SLP siamesed runners,
52MM SLP Throttle Body
Hooker Headers & Flowmaster catback
MSD6A ignition
aluminum driveshaft
World Class 5-speed
Thread Starter
Supreme Member
Joined: Dec 2000
Posts: 1,536
Likes: 0
From: Springfield, MO, USA
Car: 1986 Trans Am, 1991 Firebird
Engine: 355 TPI, 3.1L V6
Transmission: 700R4 in both
<font face="Verdana, Arial" size="2">Originally posted by crucial:
Or you could go to the local pepboys and get an IAC harness tester. It's a little device that plugs in the harness and little LEDS light up to tell you if the ECM is sending out the correct signals.
</font>
Or you could go to the local pepboys and get an IAC harness tester. It's a little device that plugs in the harness and little LEDS light up to tell you if the ECM is sending out the correct signals.
</font>
Thread Starter
Supreme Member
Joined: Dec 2000
Posts: 1,536
Likes: 0
From: Springfield, MO, USA
Car: 1986 Trans Am, 1991 Firebird
Engine: 355 TPI, 3.1L V6
Transmission: 700R4 in both
<font face="Verdana, Arial" size="2">Originally posted by crucial:
Specifically for a GM IAC !</font>
Specifically for a GM IAC !</font>
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