924Board.org

[doomer77]

Im back, after five hours of working on somebody elses porsche =P Im thinking of buying it, but first I have to make sure it works, which it doesnt now. Ill describe everything as best i can.

The car was working six months ago, but was then left untouched and now it refuses to start, the engine turns and turns but never fires. its a 1978 n/a

first we thought it was the fuel pump, so we put on a working one, didnt solve the problem. we checked the fuel distributor by unsrewing the top four bolts and theres a steady stream of fuel leaking out, so i dont think its that.
then we thought that it was a ignition issue so we changed the spark plugs to ones that gave a spark every second upon test (is this normal?), we changed the ignition coil, not entierly sure if it works but it appears to as the spark plugs are sparking.

in the end and after many tries the car started to fire hesitently but died after about 5 seconds.

what have i missed? i cannot think of anything else being wrong..
_________________
Why drink and drive when you can smoke and fly?
Carpe diem. and if that doesnt work; get drunk!

1980 924 n/a - engine swap begun
1989 Volvo 480ES

[StienbargerR]

Could It be a vacuum leak?
I found a gigantic hole in one of the fuel lines in my 78 na. Kinda weird. but, there was a burn mark and a hole, and I think that might be why mine won't start. I have new fuel lines on the way.

Ryan
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1978 924 NA
-250lb lowering springs, Euro Pistons

[P924]

Check also you injectors, pull them out, unscrew them and blow high pressure air through it, so they're are open again, also put new fuel in it because fuel becomes bad after six months.

Or else a vacuum leak is also possible..

But I think the injectors, check also all the electrical equipment, cold start injector, thermo time switch, auxiliary air regulator and CETRAINLY your fuel filter.

Greetz.
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924 1981
911T 2.2

[doomer77]

addition:
first when we took out the spark plugs they didnt make a spark at all and was covered it petrol, first we tried clening them but it didnt improve things much. after we changed the plugs and coil the plugs emitted about 1 spark a second but the engine still flooded very quickly. at the same time it felt like anything we did to the ignition system improved things.

before: car cranked but never fired
after spark plug cleaning: cranked and fired once or twice then flooded
after coil change: cranked and fired up for about 3 seconds several times
after spark plug change: best results, the car fired up for about 5 seconds reaching 700 rpms
_________________
Why drink and drive when you can smoke and fly?
Carpe diem. and if that doesnt work; get drunk!

1980 924 n/a - engine swap begun
1989 Volvo 480ES

[P924]

[Mike924]

Sounds like it getting too much fuel on start-up.

My advice would be: unwind the idle screw by about 1/2 turn to let more air in, then unplug the cold-start valve, try and start it. Is it any better?
Then lean the mixture down slightly by turning the adjuster in the fuel distributor to the left by 1/8 turn, try again.
Keep repeating this, 1/8 turn at a time until the car starts and runs, then take things from there.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

[Stampedetrail]

have you checked the fuel pump relay? If it's bad, you wont get any action on your warm up equipment. If it's really bad, you wont get any fuel pump action at all. Also, run a hot wire to the right hand resistor to make certain that the distributor is getting powered while cranking.