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Angry Cold weather starting problems ...

I fired the car up and took it out for a mid winter spin yesterday. I stopped to get gas and it didn't want to start after that. I cranked it 3 times for about 5 seconds at a time and it finally started on the third try. The oil temp was up to around 170, so basically the car was as warm as it was going to get on a cold day. It was about 35 degrees and dry outside.

I was afraid to touch the gas pedal because I didn't know if it was flooded, and didn't want to flood it more. I didn't smell any gas and it didn't blubber when it finally fired, so I'm not sure what is going on .... maybe it was starving for gas?

Another time it didn't want to fire up in the garage .... it was around 40 degrees out.

I've never had this prob in the warmer temperatures. All my fuel management is bone stock.

Anyone else have cold start issues?
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82 Porsche 930 Euro, black, 31K miles.
Factory stock other than k27 turbo, B&B headers, GHL exhaust, Tial F40, 1 bar wastegate, MSD 6A ignition, 8" and 9" Fuch upgrade, H4 Xenon headlamps and a 930S steering wheel.
Old 01-24-2010, 07:54 AM
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Sounds like a "lean" condition... If you have a way to adjust you're warm up CP, I would look at lowering it at least 1/2 a BAR... My 2-cents...
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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 01-25-2010, 08:13 AM
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Since it wouldn't start with the oil temp at 170, I'm going to call this a warm car and say it has nothing to do with typical cold start systems. I think you're barking up the wrong tree.

My money would be on one of several things fuel related. Overboost switch, yellow overboost relay, and/or fuel pump relays/fuses. I suspect that your fuel pumps weren't running when she failed to start, and any of the above will keep them from running if faulty/dirty. Unfortunately it's sporadic when it happens and can be very frustrating to find the culprit...as intermittent things are only discoverable when the car completely refuses to start. There is a ton of discussion on this topic.

Of course, I could be totally wrong and it may be a faulty WUR or ignition related. Next time it happens, first pray that you're not far from home and then do a quickie fault diagnosis to determine if you are getting fuel and spark. At least that will point you in the right direction.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 01-25-2010, 08:42 AM
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Quote:
Originally Posted by mark houghton View Post
Since it wouldn't start with the oil temp at 170, I'm going to call this a warm car and say it has nothing to do with typical cold start systems. I think you're barking up the wrong tree.

My money would be on one of several things fuel related. Overboost switch, yellow overboost relay, and/or fuel pump relays/fuses. I suspect that your fuel pumps weren't running when she failed to start, and any of the above will keep them from running if faulty/dirty. Unfortunately it's sporadic when it happens and can be very frustrating to find the culprit...as intermittent things are only discoverable when the car completely refuses to start. There is a ton of discussion on this topic.

Of course, I could be totally wrong and it may be a faulty WUR or ignition related. Next time it happens, first pray that you're not far from home and then do a quickie fault diagnosis to determine if you are getting fuel and spark. At least that will point you in the right direction.
I didn't take time to listen if the pumps were running. I would think that if they were working fine when I pulled into the gas station, what would cause them to fail upon restart? I'll have to look into that.

What I'll do on the next weather break is to take the car out and make sure I don't turn it off, then come back to the house and see if I can get the car to repeat the start problem. I'll make note if the pumps are running and maybe pull a plug or two to see if they are wet.

Thanks for the ideas.
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82 Porsche 930 Euro, black, 31K miles.
Factory stock other than k27 turbo, B&B headers, GHL exhaust, Tial F40, 1 bar wastegate, MSD 6A ignition, 8" and 9" Fuch upgrade, H4 Xenon headlamps and a 930S steering wheel.
Old 02-01-2010, 05:28 PM
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Quote:
Originally Posted by Maxx1 View Post
I didn't take time to listen if the pumps were running. I would think that if they were working fine when I pulled into the gas station, what would cause them to fail upon restart? I'll have to look into that.

What I'll do on the next weather break is to take the car out and make sure I don't turn it off, then come back to the house and see if I can get the car to repeat the start problem. I'll make note if the pumps are running and maybe pull a plug or two to see if they are wet.

Thanks for the ideas.
Unless you or a previous owner has bypassed all the various gizzmos that prevent the pumps from running unless you're cranking the starter, you won't hear them ('cause they won't be running) with just the ignition on. Got to pull air across the metering plate, thus activating a micro switch and turning on the pumps.

Of course, you can (and diagnostically should when you're having starting problems) force the pumps to run with two different methods: reach behind the fuel head and pull the blue electrical connector. The pumps will run as soon as you turn the ignition on. Or, push down on the spring loaded mixture adjustment screw on top of the fuel head until you reach resistance and push beyond just a little bit...effectively deflecting the control arm and mimicing the deflection that would normally happen when cranking the engine and drawing air. The next time you have a starting issue, do that. If the pumps refuse to run......well then, you're narrowing it down and we can troubleshoot from there.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 02-01-2010, 06:16 PM
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