Cold weather equals high idle???
#1
Cold weather equals high idle???
Hey guys ! ! !
Don't beat me up too bad as I'm very new to turbos. I am the new owner of Dan's Miata (Dan's Creation) and this incredibly cold weather in Florida is playing havoc with the idle. The car idles at 2600 most of the time and when it's not it revs up and down between 1600 and 2600. This is real annoying at stop lights. I've checked the throttle return and it is working properly with no sticking. I know I have lead in my right foot, but the high reving happens even when I'm not in the car!
For reference:
- 1.6 motor
- Greddy Turbo Kit (TD04 15G)
- Greddy Intercooler (anodized black)
- Custom Intercooler Piping
- Turbo Tony 2.5" Downpipe (w/flex coupler)
- DP6061 2.5" Exhaust (magnaflow muffler)
- 1.8L Injectors
- Walbro 190lph Fuel Pump
- Stock ECU
The car ran great prior to this cold weather (20's night - 50's daytime). Thankfully the weather is getting warmer and maybe the idle issue will go away. Any help is greatly appreciated.
Don't beat me up too bad as I'm very new to turbos. I am the new owner of Dan's Miata (Dan's Creation) and this incredibly cold weather in Florida is playing havoc with the idle. The car idles at 2600 most of the time and when it's not it revs up and down between 1600 and 2600. This is real annoying at stop lights. I've checked the throttle return and it is working properly with no sticking. I know I have lead in my right foot, but the high reving happens even when I'm not in the car!
For reference:
- 1.6 motor
- Greddy Turbo Kit (TD04 15G)
- Greddy Intercooler (anodized black)
- Custom Intercooler Piping
- Turbo Tony 2.5" Downpipe (w/flex coupler)
- DP6061 2.5" Exhaust (magnaflow muffler)
- 1.8L Injectors
- Walbro 190lph Fuel Pump
- Stock ECU
The car ran great prior to this cold weather (20's night - 50's daytime). Thankfully the weather is getting warmer and maybe the idle issue will go away. Any help is greatly appreciated.
#2
If it is on the stock ecu and the IAC is plugged in and working. I think you only have the idle screw adjustment to mess with. however, I working IAC is supposed to handle this.
Unplugged the IAC when it is a cold, and then again when warm noting if anything changes.
EDIT: You've got to have a few other computer items if you are running the stock ecu. How are you controlling fuel and timing while in boost?
Unplugged the IAC when it is a cold, and then again when warm noting if anything changes.
EDIT: You've got to have a few other computer items if you are running the stock ecu. How are you controlling fuel and timing while in boost?
#4
If it is on the stock ecu and the IAC is plugged in and working. I think you only have the idle screw adjustment to mess with. however, I working IAC is supposed to handle this.
Unplugged the IAC when it is a cold, and then again when warm noting if anything changes.
I'm at work and not able to get to the car. Where is the IAC located and how do you unplug it?
EDIT: You've got to have a few other computer items if you are running the stock ecu. How are you controlling fuel and timing while in boost?
Unplugged the IAC when it is a cold, and then again when warm noting if anything changes.
I'm at work and not able to get to the car. Where is the IAC located and how do you unplug it?
EDIT: You've got to have a few other computer items if you are running the stock ecu. How are you controlling fuel and timing while in boost?
Thanks for the advice ! ! !
#5
A bad valve? Please explain.
I've read your write up regarding building a MS and I plan on having you build one for me early next year. Please let me know what info you need from me. I heard that running the stock ECU can be dangerous, but the previous owner did the install 2 years ago with no issues other than the O2 sensor going bad occationally.
Thanks for the advice ! ! !
I've read your write up regarding building a MS and I plan on having you build one for me early next year. Please let me know what info you need from me. I heard that running the stock ECU can be dangerous, but the previous owner did the install 2 years ago with no issues other than the O2 sensor going bad occationally.
Thanks for the advice ! ! !
#7
What year is the car?
90-93 have four possible ways for air to get in (other than the throttle):
1. Idle Speed Control Valve (ISCV) -- Controlled by ECU.
2. Air Valve -- Dumb Device Controlled by Water Temperature (like a T'stat)
3. Idle Adjustment Screw -- Controlled by Your Hand on a Screwdriver
4. Vacuum Leaks -- Controlled by Wear, Tear and Ineptitude
A really nice write-up, with pictures, is here: http://www.miata.net/garage/isc.html
90-93 have four possible ways for air to get in (other than the throttle):
1. Idle Speed Control Valve (ISCV) -- Controlled by ECU.
2. Air Valve -- Dumb Device Controlled by Water Temperature (like a T'stat)
3. Idle Adjustment Screw -- Controlled by Your Hand on a Screwdriver
4. Vacuum Leaks -- Controlled by Wear, Tear and Ineptitude
A really nice write-up, with pictures, is here: http://www.miata.net/garage/isc.html
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09-30-2015 02:44 PM