MFI cold start proceedure w/ cold start disabled

[Type911]

My cold-start system on my 70E is disconnected.
Because of this its a real beeatch to start the car after its sat for 6-10 hrs.
Worse if outside in the colder amibient temperature.

My Porsche tech says he always has good luck with this proceedure.
"turn ign. on, let pump run for about 15 seconds, put pedal to the floor,
crank, then ease up on the pedal as it tries to fire"

I have tried his method but its not that easy....more like a 3-4 min
proceedure. A real pain to get started...clears out & idles great with some input from the hand throttle once it fires. My starter is getting a real workout ! With the CS sys disabled is this what Iam stuck with?

So for those of you w/ the cold-start system disconnected,
what is your method???

[Type911]

anyone care to share how they cold start their MFI sys?
My cold start sys. was disconnected by the PO.

thanks

[raspy2point2]

I Have a 1970 911S and it was modified with a manual button installed in the hole right side of stering wheel . Sso now my cold start is manual. My car was first bought in a cold climate area. My procedure is: Turn on key; pull up hand throtle; push button on dash(manualy dumps gas into stacks) ;Do that for 5-7 seconds; wait 10 seconds for gas to evaporate a little --It fires within 5 seconds. The orignal automatic cold start circut over time goes bad on some cars so you put in a manual switch and you have more control of the gas going into the stacks while starting-- A good tech person will know about the switch. Chris 70S R-Gruppe#144; Early S reg.#205

[gulf908]

Chris,

Let the fuel pump run for 12/15 seconds.
I start mine by turning the key and after several cranks(1 to 2 seconds) depress the dash start button.
The motor then starts on most or all cylinders and I play the throttle until I get a clean idle of between 1500 to 2000 revs.
I drive off straightaway.
I dont use the hand throttle as I find it tends to put too much gas in the system and stalls/backfires.
I am in a moderate(CA?) climate.

Cheers,
Dennis.

[sweetE]

With my 71E in Mile High Denver area, I pull the throttle lever all the way up, turn the key so the fuel pump starts for about 5 seconds, then key all the way to start. When engine catches, slightly depress the pedal and it starts right away.

Aaah!! The sweet sound of a 2.2L MFI.

[blucille]

it never takes more than 5 seconds of cranking, but be warned, 5 seconds feels likes forever.


hand throttle full up, let fuel pumps run 5 or so seconds, crank for 5 seconds, idle for another 15 seconds, blip the throttle up to 3000 rpm, lower the hand throttle hald-way, now it is stable enough to back out of the garage, let it idle for another minute or so, and she is ready to gently drive down the driveway...another minute or 2 and the hand throttle can be fully off, but it will take at least a few minute of gentle driving before all the popping stops.

-Lewis

[raspy2point2]

Hi Gulf908 -- Sometimes when I am cranking I hit the manual button on the dash and the engine fires up sooner. I wonder if gas is only going down the stacks when cranking or just fuel pump on is enough to produce gas flow? Chris 70S R-Gruppe#144; Early S reg#205

[gulf908]

Chris,

From an owners experience,what I am doing is to crank the motor over initially and then to give it some gas via the cold start button.
I usually get a start on most cylinders within 2/3 seconds.
My observation is that you will have to experiment with what you have on your own car,as these cold start buttons were not a standard fitting but added sometime later in the car's life for whatever reason.The method of fitting and operation will probably be therefore different on each and every car.
Maybe the MFI einsteins can chime in ?!

Cheers,
Dennis.

[RickS]

Chris,

I disconnected the positive lead to the cold start actuator, and wired in a push button switch connected to power which lives under the dash. The line coming out of the button/switch is now connected to the switch.

Starting procedure.... pull up hand throttle about a half inch (as if the cold start actuator still worked), turn key to accessory so you hear the CD/fuel pump, and depress the new button for 5 seconds, release it and start the car. No pumping, no cranking, no nothing required except the new button/switch. (My mechanic gets the credit since he told me how to set it up - which took about an hour for running wires from the dash to the actuator.

[HughH]

My car (MFI 2.4)came with a disconnected cold start mechanism and a manual switch on the dash when I got it 10 years ago.

It took a while to figure out how to use it but now the cold start proceedure is turn ignition to on position so that you can hear fuel pump working, pull up hand throttle, push cold start switch for maybe one half second to a second, do up seat belts to give it time to work (maybe 5 to 7 secs) turn ignition key (foot off accelerator) and it usually starts immediatly- ie catches without any cranking and almost always on all cylinders just as it does for a hot start

If I dont use the cold start switch it cranks for 10 to 20 secs before catching and then only on a couple of cylinders before smoothing out