 Vacuum Leaks & Timing Procedure |
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| JTSmithson |
 Mar 14 2013, 10:36 PM
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#1
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Newbie  Group: Members Posts: 4 Joined: 16-January 13 From: United States Member No.: 15,378 Region Association: Upper MidWest  |
POSTED THIS ON PELICAN ALSO:
Recently acquired a 1974 914 with a 2.0 and a single Weber swapped onto it. It had a decent miss and first thing i did was replace (not related to miss) plugs, wires, cap and rotor. Carb was taken off cleaned up and reassembled (good friend did it, knows Webers TOO well) got it all buttoned back up an restarted this afternoon. The miss it still has sounds more like a vacuum leak or the timing is that far off. Could someone shed some light on the big major areas where vacuum leaks could occur? Is the connection from the intake tubes to the engine tin a bad place for leaks? Also what is the procedure for timing this car? Thanks for all the help. Joe Attached image(s) 
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| porschefile2010 |
Mar 15 2013, 12:19 AM
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#2
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Member Group: Members Posts: 228 Joined: 26-May 11 From: Whangaparaoa, New Zealand Member No.: 13,118 Region Association: Australia and New Zealand |
I think I've read previous posts here that recommend that all the vacuum lines have hose clips rather than just being pushed on, just to eliminate any leaks anywhere. Lot of hose clips of course.
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| Mblizzard |
Mar 15 2013, 01:18 PM
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#3
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
Single Weber is not an ideal set up. But check the rubber pieces that connect the intake manifold to the carb plenum. Also check the base of the carb, both manaifolds where they meet the head, and any openings into the plenum. Check the carb it's self. Even though it was redone there is always the chance to miss something.
If you have a hesitation in a single carb application when you open the throttle wide, check your accelerator jet size. If it is smaller than a .60 mm it could be part of the hesitation problem. I changed mine to a .70. |
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| rmital |
Mar 15 2013, 01:39 PM
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#4
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Northeast optimist Group: Members Posts: 1,947 Joined: 12-December 05 From: Park Ridge, NJ Member No.: 5,268 |
...I know you said you changed your plugs....did it run well for a while once you did? Even just a "short" period of time??
......if so, check your plugs. What's their condition?? is it just missing on a certain cylinder. you could pull plug wires one at a time and see if it changes running... |
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