hey guys
i need help please

last night i changed the battery in my my99 wrx and when i went to start it,
it starts but it revs up to 4000rpm and then back to 1000rpm consantly but i can do anything with the throttle

it has a stock ecu btw

any help would be great guys

thanks

__________________
GREEN MY99 WRX WITH IHI VF30

Check all vacuum lines!

__________________
[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

ok ill check them thanks mate

__________________
GREEN MY99 WRX WITH IHI VF30

Left field possibility:

Are your thermal fans coming on when cold? I had a weird issue where the ecu thought it was hot, so the fans would come on, then the ecu would hunt up and down for idle.

Try resetting your ecu.

forgot to mention this (sorry) when this happened the fuel guage went right down and fuel light come on but prior to it hapening i just filled the tank up 30 mins prior

__________________
GREEN MY99 WRX WITH IHI VF30

could it be the ecu

__________________
GREEN MY99 WRX WITH IHI VF30

Did you happen to short anything during the battery swap?

Try disconnecting the battery for 5 minutes, reconnect it, start the car (let it idle, don't touch the throttle) and allow it to relearn the idle for a few minutes.

Shut it of & re-start it...

Post back if that doesn't fix it.

There is another way to reset the ecu but try the battery disconnect first.

HTH

__________________
[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

ok mate ill try that cheers

__________________
GREEN MY99 WRX WITH IHI VF30

worked a treat thankyou ross

__________________
GREEN MY99 WRX WITH IHI VF30

Hi Guys
I am also having an Idle problem

Idles at 800 rpm as usual
However, it has trouble holding the idle once i pull up to stop

Seems to go into a hunting mode

I have had a few flat batteries and have had to jump start it

I will disconnect the battery and leave it for a few hours to reset the ECU

Any other ideas
I have already changed the throttle sensor but, it made no change
Sounds like a ECU problem