Question about Porsche 911

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1978 Porsche 911SC Cold start with correct tick over of about 800 rpm. Almost immediately however rpm increases up to a tickover speed of about 2800 rpm. This rpm is sustained continuosly up to and beyond fully warmed up temperature. After shut down, then normal starting procedure, tick over rpm of 800 rpm is established and maintained correctly. Is this a faulty thermal time switch, faulty cold start valve or warm up regulator in the K Jetronic system? Or could it be a wiring fault? Any suggestions? Thanks!

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Hello there
can you check if your distributor advance plate is free of movent?
Or your vacuum hose for advance is working(the one on the right)Check your timming as well.it is 5 before tdc.
Check this out and get back to me with an email
Seems like your idle get stuck on high rmp right?
Let me know what do you mean tick over?
proporsche@yahoo.com

proporsche

Posted on Mar 26, 2011

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Posted on Jan 02, 2017

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Why do i hear my fuel pump on a 2004 pontiac bonneville whining up and down?


Walt, You will hear the fuel pump at times. When you take the gas cap off the fuel tank is acting somewhat as an echo chamber that is amplifying the noise of the fuel pump. Presumably the engine is ticking over when you remove the gas cap? Otherwise the fuel pump should not be running.

The fuel pump only supplies fuel on demand - obviously. The pump will run to pressurise the system to meet demand and if that demand for fuel fluctuates, the pump will run down or increase speed accordingly. This speeding up and running down of the pump is constant.

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