914 idle issue, i've search but found nothing Options

[justdrive914]

my 914 1.7L is all oe and I've done a lot of work to it. i replaced a lot of parts and now i cant get my idle to 975 or so it seems to stay at 1800 whats the deal anyone know? i have adjusted and adjusted, i cant get it!???
Thanks andrew

[Rand]

Cold start valve just injects extra fuel IF the temps are VERY cold (like near freezing).

Things that can cause high idle on DJet:

1. Vacuum leak below throttle's butterfly.
2. Throttle butterfly not closing squarely.
3. Overly advanced timing.

Sometimes tracing the vacuum leak can be a pain, but it most certainly can be a simple and methodical process because there are only so many potential sources between the butterfly and the heads, so follow the path....

-Injector seals (2 per injector)
-Phenolic block between heads and intake runners
-Rubber boots between intake runners and plenum
-Crack in plenum (usually around vertical reinforcement tubes)
-Gasket between plenum and throttle body
-Excess wear around butterfly pivots
-Air bypass / idle adjust screw in throttle body
-Any vacuum tap on plenum or throttle body below butterfly. (Some of those taps have to be traced upstream to parts that can cause the problem, like the AAR. But on Djet, you can just pull the hose and plug the hole like Rich said to help troubleshoot most of those.)