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IAC fail after ECU reset?

  • 02-12-2012 8:39pm
    #1
    Aphex
    Closed Accounts Posts: 653 ✭✭✭


    Hello everyone, I'm hoping somebody could help me out with an issue regarding idle power.

    I drive a 00 ford focus

    The other day I attempted to reset my car's ECU by disconnecting the negative terminal of the battery for 15-20 minutes and then leave her running idle for another 15-20.

    I done this because I was having some really erratic idle problems (when cold) and acceleration problems too that annoyed the hell out of me and a lot of suggestions on the web was to reset the ECU. I have done this before with positive results but this time I wish I hadn't have done it.

    While the hood was open I thought I'd take the opportunity to unplug the MAF Sensor to see if the connections were clean as was also suggested online. Everything looked good so I plugged it back in and went ahead with the reset.

    So afterwards, I hop in the car and take her for a ride to see if there is an improvement in rough idle and acceleration. All seemed good until I was stopping at traffic lights when a new symptom appeared that I never encountered before. As I was slowing to come to a complete stop the revs would drop all the way and eventually the engine would cut out. This has been happening ever since. Now what I have to do is carefully apply some pressure on the accelerator (with clutch engaged) to keep her "awake" while alternating to the brake pedal to come to a stop.

    These symptoms seem to be IAC related, but I didn't do anything else when the hood was open except disconnect the battery and check the MAF Sensor connection.

    Does anyone know what I done wrong that would cause the IAC to be acting up?

    Thank you in advance.


Comments

  • #2
    enumbers
    Registered Users, Registered Users 2 Posts: 552 ✭✭✭enumbers


    as a basic measure it would be worth taking the ICV of and cleaning it possibly just sticking a little and not able to react quickly enough to maintain idle


  • #3
    Aphex
    Closed Accounts Posts: 653 ✭✭✭Aphex


    Thank you for your reply.

    I will try that, thanks.

    Also, is the IAC valve the only thing that could be causing this to happen?


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