Curious annoyance, -- I have a theory; what is yours? |
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Curious annoyance, -- I have a theory; what is yours? |
Dave_Darling |
Apr 4 2022, 09:49 PM
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#1
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
I have a small annoyance that I've been putting up with when trying to start my 914. It's been this way for years, BTW. I have a theory about what is going on, but I am interested to hear yours.
My car can be hard to start. It will crank and not catch. After one or sometimes a couple of ~15 second tries at starting, it will cough when I turn the key off again. The next try it starts up. So, any theories about what is causing this? I see two primary paths for this sort of failure; fuel or spark. --DD |
76-914 |
Apr 4 2022, 10:34 PM
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#2
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,509 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California |
Are you saying that the instant the key returns to the on position it coughs like it wanted to start? If so I'd be curious as to the voltage at the coil when cranking.
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Dave_Darling |
Apr 5 2022, 12:27 AM
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#3
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Sounds like fuel to me. How long does it take you to build proper rail pressure? Also what motor/injection? Fuel pressure comes up within the first few seconds of cranking. The car is a 2.0 liter (1974) with D-jet injection. Are you saying that the instant the key returns to the on position it coughs like it wanted to start? If so I'd be curious as to the voltage at the coil when cranking. That is correct, when I turn the key off it gives one cough as if there was a single combustion event. After it does that it will start normally. I am suspecting the ignition as well, but I haven't yet measured the coil voltage when it is in its failed state. I hadn't considered the ignition switch; that is a good thought!! --DD |
mate914 |
Apr 5 2022, 06:08 AM
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#4
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Matt Group: Members Posts: 757 Joined: 27-February 09 From: Eagles mere, PA Member No.: 10,102 Region Association: North East States |
Sounds like fuel to me. How long does it take you to build proper rail pressure? Also what motor/injection? Fuel pressure comes up within the first few seconds of cranking. The car is a 2.0 liter (1974) with D-jet injection. Are you saying that the instant the key returns to the on position it coughs like it wanted to start? If so I'd be curious as to the voltage at the coil when cranking. That is correct, when I turn the key off it gives one cough as if there was a single combustion event. After it does that it will start normally. I am suspecting the ignition as well, but I haven't yet measured the coil voltage when it is in its failed state. I hadn't considered the ignition switch; that is a good thought!! --DD I remember being a very young man 17 or 18 at a east coast ramble with John Dunkel from Rennlist. Pelican Parts sent you over as a Porsche 914 Guru. I looked up to you and wished I had your knowledge. Now, twenty two years later I always carry two ignition switches. The switch will crack and only partially work. Twenty mins to change. Good luck, Matt (IMG:style_emoticons/default/flag.gif) |
maf914 |
Apr 5 2022, 08:00 AM
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#5
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Not a Guru! Group: Members Posts: 3,049 Joined: 30-April 03 From: Central Florida Member No.: 632 Region Association: None |
Now, twenty two years later I always carry two ignition switches. The switch will crack and only partially work. Okay, sorry DD (Dave), slight hijack. I have replaced my ignition switch twice in the past after experiencing mystery progressive starting failures. Several ignition switches are available with prices ranging from $60 to $6. Are there any that are recommended? Below are a few examples. https://www.pelicanparts.com/cgi-bin/ksearc...ignition+switch https://914rubber.com/ignition-switch-1 |
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