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CorsePerVita · Joined: 25 Jul 2008 Posts: 1992 Location: Redmond, Oregon

The '79 has been running like a champ, even when it's colder outside. However, every time we have a freezing morning, the damn thing will not start.

It cranks, and it cranks quickly as it should, so it isn't a weak starter issue. I bought a new battery. The coil is about a year old or so... and is original Bosch NOS coil for the '79, factory.

New cap, rotor, plugs, wires. New fuel filter. Injector cleaner recently ran through.

Car cranks and cranks and cranks but acts like it isn't firing as all. Doesn't cough, doesn't spit. Nothing. Just endlessly cranks.

I am completely baffled as to what it may be. It's never done this before and is confusing the living hell out of me.

I managed to get it one morning with some starter fluid, but it also wasn't totally freezing outside. Soon as the ice comes, so does my no start. I'm starting to get annoyed to hell when it does this, because it didn't used to do this and just started doing this and I have no idea what is causing it.
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS

michaelodonnell123 · Joined: 20 Mar 2015 Posts: 235 Location: New Jersey

Maybe a lazy/tired fuel pump that just doesn't work as hard as it needs to in freezing weather.
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MOD
1988 Porsche 924S
2007 Jaguar XK
2012 Fiat 500

pcelenta · Joined: 16 Feb 2007 Posts: 546 Location: long island,ny

Did you check the cold start injector and auxiliary air valve?

CorsePerVita · Joined: 25 Jul 2008 Posts: 1992 Location: Redmond, Oregon

Lau Christophersen · Joined: 17 May 2013 Posts: 123 Location: Denmark/Copenhagen

Water somewhere in the system?
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76 924 (PARTS)
77 924 (PARTS)
77 924 converted to 924S
77 928
79 931
79 931(PARTS).
79 931 Carrera GT look (PARTS).
79 931 with VEMS and opgrades
81 928S +30 cm widebody kit
82 924 (SOLD)
83 928S
86 944
86 944 (S2(SOLD))
89 944 S2 (SOLD)

CorsePerVita · Joined: 25 Jul 2008 Posts: 1992 Location: Redmond, Oregon

pcelenta · Joined: 16 Feb 2007 Posts: 546 Location: long island,ny

On the cold days you are going to need some extra fuel to start it up. If the cold start injector is not functioning you may have a difficult time kicking it over when it is stone cold. The auxiliary air valve could be stuck closed. This can also make it very difficult to start when cold. Also. Check all your vacuum lines.

morghen · Joined: 21 Jan 2005 Posts: 9095 Location: Romania

Check the plugs if they are wet after a cranking but no start session.
If they are not wet then you aren't getting fuel.
If they are wet check if if you have spark.
If you have spark check that you have a good spark not a flimsy one.
If you have fuel and good spark check the compression.
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