Mach 1 wont Idle -

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Old 09-22-2010, 01:07 AM   #1
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Default Mach 1 wont Idle

Ok I have a stock 2003 Mach 1 that just cracked 100k miles. I went to get in the car today for work and it would crank but not idle. If I give it gas it will stay running with no problem untill I let off the gas and it just dies out. I put the OBD II on it it is throwing zero codes. I checked for vaccum leaks, found none at all. I changed the TPS sensor no change at all in the idle or lack of idle. I even pulled the PCV valve and MAF off cleaned them and reinstalled, again no change. I almost have my mind made up that either the sensor is bad in the PCV valve or the Idle Air sensor is bad. I have never seen a PCV valve with a sensor so I'm not sure what the symptoms would be when they go out. If anyone could be of assistance I would greatly appreciate it.
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Old 09-22-2010, 04:25 PM   #2
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My first guess would be IAC valve. Don't clean it...replace it and report back.
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Old 09-23-2010, 04:43 PM   #3
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^^I'll try this first.
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Old 09-25-2010, 09:56 PM   #4
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Ok I did a full tune up and replaced the IAC and it idles fine now thanks for the help.
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