RPM's hang returning to idle.
#1
Elite Member
Thread Starter
iTrader: (9)
Join Date: Jul 2007
Location: NYC
Posts: 5,710
Total Cats: 3
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I have started experiencing the weirdest issue i have ever seen and I have no idea what it is.
If I rev the engine, even blip the throttle past 1200 rpm just slightly, on the way back down the rpm's would hang at 1200 for 3 seconds and then drop to normal idle.
If I am in gear, slowing down, force the rpm's down below 1200 rpm and get off the clutch, they will bounce back up to 1200 for 3 seconds and then come down to normal idle.
At first I thought it was my throttle cable getting caught, but thats not it. I thought maybe the IAC but it responds properly to the AC turning on and the fans.
I am completely baffled. It started happening just out of the blue.
If I rev the engine, even blip the throttle past 1200 rpm just slightly, on the way back down the rpm's would hang at 1200 for 3 seconds and then drop to normal idle.
If I am in gear, slowing down, force the rpm's down below 1200 rpm and get off the clutch, they will bounce back up to 1200 for 3 seconds and then come down to normal idle.
At first I thought it was my throttle cable getting caught, but thats not it. I thought maybe the IAC but it responds properly to the AC turning on and the fans.
I am completely baffled. It started happening just out of the blue.
#6
Elite Member
Thread Starter
iTrader: (9)
Join Date: Jul 2007
Location: NYC
Posts: 5,710
Total Cats: 3
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I haven tried this because for me to disconnect the idle valve is a mission and a half. But I assume because the RPM's hang and then drop, its the IAC doing it.
Unless you want to tell me that if I disconnect it and the symptom stops then my IAC is acting up.
I will agree that this is an inadvertent benefit which is why it doesnt bother me that much. Still strange though.
Unless you want to tell me that if I disconnect it and the symptom stops then my IAC is acting up.
I will agree that this is an inadvertent benefit which is why it doesnt bother me that much. Still strange though.
Thread
Thread Starter
Forum
Replies
Last Post
Zaphod
MEGAsquirt
47
10-26-2018 11:00 PM
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
JesseTheNoob
DIY Turbo Discussion
15
09-30-2015 02:44 PM