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914World.com _ 914World Garage _ high rev

Posted by: VRROOMM1 Sep 9 2013, 09:56 AM

my brother in law has a 1972 1.7 with fi the rpms stay up when you let off the gas the ped is not boun up . if I rev it from the motor it stays reved and slowly gose down. any ideals? thanks doug h

Posted by: Bob L. Sep 9 2013, 10:54 AM

I would look at the throttle return spring, it may be weak/stretched.

Possibly "dirt" causing some resistance to the throttle closing easily, so it returns slowly.

Posted by: JawjaPorsche Sep 9 2013, 11:57 AM

Where the throttle cable comes out the firewall maybe be a problem. My throttle cable was sticking too because there is a metal shelve and then the cable. My cable had a sharp angle coming out the metal shelve. I made sure that excess cable can be pushed down through the engine tin to the firewall. To help prevent the sharp angle, I got an old fuel line about two inches and split it and placed it over the shelve and cable then zip tied it. Has not gotten stuck since.

Posted by: jimkelly Sep 9 2013, 12:14 PM

yeah - disconnect throttle cable and see if engine responds the same by hand throttling.

cables do fray over time.

Posted by: 02loftsmoor Sep 9 2013, 12:40 PM

if still slow to come back after disconnecting the cable, check for vacuum leaks