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Idle running really high
Hi everyone the car is running a really high idle. I’m
Stumped and need opinions. It’s 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 didn’t change anything this time. It’s a new Motorsport harness so I’m not sure what to do I want to enjoy the car for a few more weeks since it’s been down all summer but I want it running normal again
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Seen similar issue with aftermarket coolant temp sensor or broken wire in the harness.
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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
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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
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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.
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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
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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)?