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Underbody braces, turbos and more!

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PostPosted: Fri May 05, 2017 9:47 am 

Joined: Thu Mar 10, 2016 10:53 pm
Posts: 34
Location: San Diego, ca
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?

PostPosted: Sat May 06, 2017 12:08 am 
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Joined: Tue Jul 01, 2008 9:46 pm
Posts: 813
Location: Great Falls ,Mt.
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.


PostPosted: Sat May 06, 2017 6:47 am 
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Joined: Mon Dec 01, 2003 12:47 pm
Posts: 11682
Location: columbus, ohio
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:

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PostPosted: Sun Jun 25, 2017 10:29 am 

Joined: Mon Jun 05, 2017 10:31 am
Posts: 3
Location: Pakistan
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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