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74 Porsche 914 extreme high idle (3000-4000)

So while rebuilding my 74 914 I came across someone selling the original fuel injection and decided to replace the dual webers with it to make it more original. Now the engine is back in the car and everything is hooked up. It took forever to get the thing started. Fix one thing then find something else. The biggest problem was the fuel return line being clogged with gunk cause the pressure to build up too high, but now I got that fixed and it actually starts but idles way too high (around 3000-4000 rpm) checked the timing, turned in the screw on the throttle body, adjusted the throttle control valve, checked the decel valve for leaks. And now I'm out of ideas. Please help. Anything is appreciated.
Old 12-20-2010, 07:25 PM
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It's one of the vacuum lines leaking.


KT
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Old 12-20-2010, 07:39 PM
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Is there an easy way to find out which one or should I just go and start replacing the old lines?
Old 12-21-2010, 07:18 AM
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Quote:
Originally Posted by Morganr81 View Post
Is there an easy way to find out which one or should I just go and start replacing the old lines?
There's tons of places where they can leak air. This is D-Jet, correct?

I'd go through the Vac lines one by one looking for the one (or multiple). Plug/unplug as you go until you find the offenders.

Also make sure they are all connected and none are missing on the air-box. Remove the air box and check the bottom of the throttle body for cracks.

Check the TB gasket.

Did you get the FI specific thick gaskets that go between the runners and the heads? If not, you'll leak there ...

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Old 12-21-2010, 12:28 PM
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Yes it is the D-Jet, and I do have the gaskets between the runners and the heads, they came brand new with an engine rebuild kit I purchased. Also there are no hoses missing on the air box. I guess ill just start having to check the all the lines. Thanks all
Old 12-22-2010, 10:03 AM
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3-4K means one heck of an air leak. I don't know of anything else that could cause that. Are there any hoses connected directly from the air cleaner to the manifold, with no "component" in the middle? If so, those are incorrect and are at least contributing to the high idle.

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Old 12-22-2010, 10:38 AM
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There is one hose from the air box that goes to the charcoal canister in the front, there is one that goes to the aux air regulator, there is one that goes to the decel valve, and the is another that goes to the top of what I think is called the anti flashback valve. The other two hoses coming from that go to a port on the top of each cylinder head. Now the port they plug into looks like mangled piece of pipe shoved into a hole on the top each cylinder head, and they cant be sealed because I can easily pull the little piece of pipe out. Actually, in the past when I have tried to remove the hose from that port, the little piece of pipe comes out of the hole with the hose and then I'd have to get a pair of needle nose to pull the little piece of pipe out. Could this be it?
Old 12-22-2010, 11:05 AM
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Remove the air box and check the bottom of the throttle body for cracks.
What i meant to say was, check the bottom of the intake plenum for cracks. They like to crack right around the welded in "through" tubes.

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Old 12-22-2010, 11:23 AM
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