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Idle bounces up and down?
http://www.teamswift.net/viewtopic.php?f=22&t=62605
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Author:  Swift sensation [ Fri May 05, 2017 9:47 am ]
Post subject:  Idle bounces up and down?

Why does my 89 GTI idle fluctuates up and down between 2000 & 1000 RPM when I first start the car in the morning! It stops doing it after a few minutes? Why?

Author:  91 ragtop [ Sat May 06, 2017 12:08 am ]
Post subject:  Re: Idle bounces up and down?

Mine was doing that only it was going up to 3000 rpms. It's a sign of a bad cold start valve which is on the back of the intake plenum. I took the valve off and made a new gasket without the hole in it and bolted it back on and it works great now.


Ken............

Author:  t3 ragtop [ Sat May 06, 2017 6:47 am ]
Post subject:  Re: Idle bounces up and down?

yep, it's a bad cold start valve. :blackeye:

they used a wax bead in its design that degrades after time. then the valve won't remain open to control idle.

i replaced mine with a blanking plate. now when i start the engine it goes directly to it's base idle of 800 rpm and stays there. :wink:

Author:  Bill tanner [ Sun Jun 25, 2017 10:29 am ]
Post subject:  Re: Idle bounces up and down?

Hi ,
I might not be posting to the exact/correct forum , but couldnt find the exact one . However, I have swapped g13dohc/g16 , running g10 ECU and throttle . Now the problem is that the car is not showing up similar potential as my previous setup , that was g13dohc/g16 with g16 ecu and throttle. I am running it on 95 Ron on 3-4 bar fuel pressure. Maybe it's because of the ECU? And I am running d16 injectors.

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