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Idle speed 

 

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 Post subject: Idle speed
Posted: Sun Aug 15, 2010 8:52 pm 
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Location: melbourne
VIC, Australia

gday, i have just converted my ef to manual and took it for a drive the other night and have noticed when i start it. it will rev up to 2000rpm then eventually comes down to just over 1000rpm. is there a reason for that? anything i can do about it? cheers
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 Post subject: Re: Idle speed
Posted: Sun Aug 15, 2010 9:52 pm 
Getting Side Ways
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Location: toongabbie
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Welcome to fordmods, are you running a manual computer or just doing the resistor trick?

If its the later get a manual computer

 

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 Post subject: Re: Idle speed
Posted: Sun Aug 15, 2010 10:37 pm 
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nah im running the resistor trick. what should i do?
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 Post subject: Re: Idle speed
Posted: Mon Aug 16, 2010 2:58 am 
Tyre Shredder
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fordef1995 wrote:
nah im running the resistor trick. what should i do?



Rev hang is generally caused by the TPS voltage at idle being more then 0.7V. Base idle at 600rpm or a little lower and TPS at aroung 0.70v will stop the rev hang...

 

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 Post subject: Re: Idle speed
Posted: Mon Aug 16, 2010 4:11 pm 
Stock as a Rock
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Joined: 6th Feb 2006

Ride: EF GLi 5 speed

Location: sydney
NSW, Australia

I have the same problem, and would like to know how you go about altering the TPS voltage. Or alter the idle speed ( is it a screw on TPS? )
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 Post subject: Re: Idle speed
Posted: Mon Aug 16, 2010 10:26 pm 
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Location: melbourne
VIC, Australia

yeah its kinda annoying cos i just wanna fix it and make it idle normal.
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 Post subject: Re: Idle speed
Posted: Tue Aug 17, 2010 11:39 am 
Fordmods Junkie
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Ride: Kia Rio - 1.4L Auto

Power: 238 rwkw

Location: Westside
VIC, Australia

It's because you have an auto ecu that is expecting a rather large and heavy torque converter to be connected to the flywheel and has to idle higher to compensate for that.

Most times you can reset the base idle lower and it should sort itself out over a few days. But it can be a tricky balancing act. Too little base idle it will always stall, too much and it will over rev and hang during gear changes.

One good way is to make up a cardboard spacer to put between the ISC and throttle body, but make the holes smaller than whats in the ISC. I think about 10 or 12mm from memory, and this will help greatly. Will still let the ISC do what it thinks is right, but restricts the volume of air enough to maintain the right idle and rev characteristics.
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