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post #1 of 8 (permalink) Old 07-12-2006, 07:50 PM Thread Starter
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Iac Problem

I have a 96 3.5 and have been having idle problems along with missing and motor jerking while maintaining a steady pace on a long stretch of road.

I just pulled my IAC and it was covered in oil and down in its little hole was more oil. Is this normal ?

Also heres the good one. I tested my coil pack and it is fine, noticed that #3 an #6 wires were crossed, was getting around 18 mpg and after I changed the wires back to the correct firing order the idle has gotten worst and my mileage has dropped to 14. Any ideas ?


Thanks to all
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post #2 of 8 (permalink) Old 07-12-2006, 08:00 PM
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I just cleaned the IAC not to long ago and it seemed to help. I think its just a normal maintance thing now for me.

The wires...have no idea...switch them back and see what happens
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post #3 of 8 (permalink) Old 07-12-2006, 08:02 PM
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Umm, I've got to ask, are you sure you got the # on the coil with the right cylinder ? Also when was the last time you put a new PCV Valve on ? I'd also check for any code's too. Here's a pic on how the wire's sould be :



And how's your plugs ? And one last thing, when was the fuel filter changed last ? If old may want to replace it.

Last edited by Strongt; 07-12-2006 at 08:06 PM.
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post #4 of 8 (permalink) Old 07-12-2006, 11:55 PM
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I recently had a vacuum leak in my egr system that was giving me a rough idle and would kill my car when I let off the throttle quickly. I deleted the egr system and sealed everything up, which fixed my leak. I was going to replace my leaking egr valve, but haven't gotten around to it yet.

If cleaning your IAC didn't do anything then I would check the spark plugs, intake seals, and fuel pressure in the fuel rail.
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post #5 of 8 (permalink) Old 07-15-2006, 07:58 AM Thread Starter
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I know that I got the plug wires right as I went with the same diagram you placed on the site.Got mine from the book and the coill pack. Also changed the fuel filter this spring along with the pcv valve.

Also have noticed that it runs pretty good till the water temp starts to rise and then it starts to shake and shutter.
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post #6 of 8 (permalink) Old 07-15-2006, 10:30 AM Thread Starter
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Just cleaned the IAC and it says in the book that if you leave it out an turn the key on it should move.
Mine didnt so i am thinking that the IAC is bad.
does this sound correct to anyone else?
Also is there any other test you can perform at home to test the IAC?
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post #7 of 8 (permalink) Old 07-23-2006, 07:46 AM
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Question

I am fighting with the IAC motor on my 93. I don't think it is moving at all. Can anyone tell me if this works of of voltage or all grounds?? My car has a intermenting check engine light with a code 25. I am starting to think I have a wire shorting to ground or a bad computor. How can I test each wire at the IAC ?????.

Thanks
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post #8 of 8 (permalink) Old 07-23-2006, 12:34 PM
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Quote:
Originally Posted by mopar4ya
I am fighting with the IAC motor on my 93. I don't think it is moving at all. Can anyone tell me if this works of of voltage or all grounds?? My car has a intermenting check engine light with a code 25. I am starting to think I have a wire shorting to ground or a bad computor. How can I test each wire at the IAC ?????.

Thanks
Dan
Well, sounds me like I'd be getting a new IAC. Just because of the code 25. I think if you just got a new one you would be just fine. Anyway, maybe this will help you some on testing the wires:

Idle Air Control (IAC) Motor

TESTING



1993-95 Models

See Figures 1 and 2


Fig. 1: Wiring schematic for the IAC motor-1993-95 models




Fig. 2: Pin color code connections for the IAC motor harness-1993-95 models



For this test, the Diagnostic Readout Box (DRB III) or an equivalent diagnostic tool is necessary to actuate the IAC pintle.

Allow the engine to warm up to normal operating temperature, then idle at normal engine speed.

Before testing any electrical component, inspect the wiring and connectors for damage. Also wiggle the connectors to ensure a that they are firmly engaged.

Unplug the IAC connector.

Using a voltmeter, measure each of the four terminals of the connector (wiring harness side) to engine ground (one at a time). Refer to the accompanying wiring illustration. While probing each terminal to ground, momentarily open and close the throttle.

If any one, or more, of the terminal circuits registers below 1.0 volt, refer to Step 8.

If all of the terminal circuits registered above 1.0 volt, proceed to the next step.

Turn the engine OFF.

Detach the PCM connector and check to make certain that all of the terminals are clean and tightly installed in the connectors.

Using an ohmmeter, test the resistance of each of the four circuits from the oxygen sensor and ensure the sensor is working properly. The PCM uses a reference signal from the oxygen sensor to control the IAC motor position. If the oxygen sensor is not working correctly, it will give a false IAC position.

If the resistance of any of the circuits is below 10.0 ohms, replace the PCM. If any of the circuits register resistance above 10.0 ohms, repair the wire circuit with the high resistance.

Inspect the engine for any vacuum leaks.

If any leaks are found, repair them and retest the IAC from the beginning.

Otherwise, continue to the next step.

For the following of steps, the DRB III scan tool or equivalent is required.

Remove the IAC from the throttle body; leave the harness connected to it.

Plug the scan tool into the data link connector, and actuate the IAC.

If the IAC pintle extends and retracts, the IAC is OK and should be reinstalled.

If the IAC does not extend or retract, the IAC is defective and a new one should be installed.

1996-97 Models

See Figures 3 and 4


Fig. 3: Wiring schematic for the IAC motor-1996-97 models




Fig. 4: Pin color code connections for the IAC motor harness-1996-97 models



Turn the engine ON for 10 seconds.

Turn the engine OFF.

Turn the engine ON for 20 seconds.

Using the DRB III scan tool or equivalent, actuate the IAC motor.

With a voltmeter, probe the IAC motors 4 drivers. Refer to the accompanying wiring illustration.

If the voltage is over 5 volts, perform the following test:

With an ohmmeter, check the resistance of the circuits 1-4 of the IAC driver.

If the resistance on each driver is below 5.0 ohms on any of the drivers, the drivers circuits are shorted together and must be repaired.

If the resistance is above 5 ohms, replace the the IAC motor.


2003 Jeep Grand Cherokee my current DD

1995 3.5L Intrepid, Sold in 2010
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