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Thread: Idle running really high

  1. #1
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    Idle running really high

    Hi everyone the car is running a really high idle. Iím
    Stumped and need opinions. Itís a 302 mass air car. Just had it tuned at diagos drive fantastic took it racing the next day after the first pass idle spiked I replaced the iac with a used one I had it ran great on my way to work yesterday idle spiked again. I have new coolant temp
    Sensor tps is adjusted if I disconnect iac the idle drops checked for vacuum leaks everything checks out. I replaced the iac again and it didnít change anything this time. Itís a new Motorsport harness so Iím not sure what to do I want to enjoy the car for a few more weeks since itís been down all summer but I want it running normal again

  2. #2
    Member bbriann's Avatar
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    Could be in the tune

  3. #3
    Admin ZR's Avatar
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    Seen similar issue with aftermarket coolant temp sensor or broken wire in the harness.

  4. #4
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    I stripped a bunch of factory intakes not long ago I will
    Check one of the used ones and see if that fixed it up. The new one is a standard one

  5. #5
    Admin ZR's Avatar
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    Not sure if still available or not but Ford had introduced a newer style sensor and pigtail for the 5.0 push rod

  6. #6
    Club Sponsor Parkway Ford Lincoln SVT's Avatar
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    That updated sensor with the new connector is still available, Motorcraft part number DY-1145. CAN retail is $93.40, TMC club price $58.38 + shipping and HST.
    Parkway Ford Lincoln SVT - Waterloo
    www.parkwayford.ca
    toll free lines:
    sales dept 866-980-6752
    service dept 888-785-4008
    parts direct 844-339-0452
    We're on Instagram: parkwayford

  7. #7
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    Still no change I tried everything I cut a brand new Motorsport harness for the update sensor and still no change I have done everything I know idles around 2500 unplug the iac and it drops and runs fine with a slight hunt iac is new there is adjusted nothing in the throttle body coolant system is burped never been stumped so bad before and I like to think I know this system really well

  8. #8
    Admin ZR's Avatar
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    TPS voltage?

  9. #9
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    .98volts

  10. #10
    Admin ZR's Avatar
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    -any chance upper intake is sitting tipped, either it or vac port hitting intake?
    -does throttle body blade have a drilled hole it's not suppose to have?
    -sure egr is fully closed (if equipped)?

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