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74 911 with cis sitting for 60 days....
My car went for a complete paint job. It was sitting for 60 days till job was done. Now I canīt take it out the shop. I crank it it starts for less then 1 sec. and then it halts. Unfortunately I left the car for painting with only 1/4 gas.
What do I need to do, to make it start? Tks, Marcelo 74 2.7 cis.... |
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06-12-2000, 07:20 AM
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If have seen these same symptoms before. If there is a hole in your air handling system (missing or opened popoff valve, injector missing from its home in the intake runner or any other place where air can get into the intake plenum wihtout going past the Air Flow Sensor plate), then the cold start injector will spray (because it is a 'Motronic' style injector which opens electrically) so the car starts for just a second, but then the other injectors do not spray because there is not enough air going past the air flow sensor plate to push it up so that fuel pressure gets to the six injectors (this should have been several sentences).
Another possible cause (fairly likely in my mind) is that fuels pressure has bled down too low to open the injectors. You can take the fuel pump relay out and 'hotwire' it so that the fuel pump runs without running the starter or motor. This would pressurize the system. Let us know what you find. ------------------ '83 SC |
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06-12-2000, 08:15 AM
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Doesn't your pump gas have 20% ethyl alcohol in it? You may have a bunch of absorbed water settled out in the bottom of your fuel tank ... and the 'burst' of engine running was just from the gasoline left in the system, then it may have been extinguished by water contaminated fuel ...
You may want to jumper the fuel pump relay as Super suggested, but disconnect the fuel line at the output side of the pump, and put a temporary hose on it, and run a few liters into a catchpan to see if any water is present. ------------------ Warren Hall 1973 911S Targa |
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06-12-2000, 08:40 AM
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Tks guys....but were is this relay and how do u "hotwire"?
Iīll try this tonight.... |
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06-12-2000, 09:34 AM
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There might be some residual pressure ahead of the pump, I cannot remember for sure in the CIS system. (well, I'm fairly sure).
Before making the pump run, and catching gas (and water?), I would take the fuse for the fuel pump out, than crank the engine for a few secs. to make sure that most of the pressure in the fuel system (lines) is relieved throught the injector(s). This way, when you disconnect the fuel line ahead of the pump, it won't squirt all over the place. It's recommendable that you disconnect the battery after removing the fuse for the fuel pump as well. Ofcourse you don't want any sparks with fuel... Hope this helps, Ahmet |
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06-12-2000, 09:36 AM
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Marcello,
In checking the circuit for the '74's, there is neither fuse or relay, when the ignition switch is on, the pump runs! So, I would recommend removing the lead from the distributor to the CDI-unit ... the 1/4" quick disconnect on the outside of the distributor to eliminate all spark while cranking over the engine to clear any water, assuming you find water in the gas! ------------------ Warren Hall 1973 911S Targa |
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06-12-2000, 10:34 AM
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This is what happened: I had the car for rust and paint job. So the guy while restoring the rust in the rear left side of the chassis, he cut the fuel line that goes from the tank to the pump. Know its fixed and running. Just one question: Why didnīt fuel spill through that line when i tryed starting the car?
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06-12-2000, 01:41 PM
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There is no pressure between the pump, and the tank. (well other than what little is applied by gravity, depending on wheather the pump is located above the fuel level, or not).
What I'm surprised at is that he didn't explode it when he cut the line... Ahmet |
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06-12-2000, 07:00 PM
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