924Board.org

944cabby · Joined: 23 Jan 2007 Posts: 55 Location: UK

I've spent the weekend trying to get my '77 924 to fire up with no success and late yesterday to top it all the timing belt snapped.
I have a new belt ready to fit and the upper timing belt pulley mark matches up with the pointer on the rocker cover.
The notch on the V belt pulley lines up eith the pointer on the oil pump and the timing mark on the flywheel ("0"?) is visible through the housing.
Does this sound all correct before i go ahead and tighten everything up as the previous owner had it set quite different - the v-belt pulley was marked in a much different place and no marks were visible on the flywheel housing.
Any advice is much appreciated.
http://img262.imageshack.us/my.php?image=timingmarkskp2.jpg
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1977 martini 924
1983 met claret 924 lux (sold)
1979 burgundy 924 (broke it for spares)

datatrain · Posted: Tue Sep 23, 2008 3:41 am Post subject: set up

That's how my 78 924na is set up.
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'78 924 NA with Collector plate
33 year old car, with me for 21 yrs
Mint '92 318i BMW
Near mint '98 Buick LeSabre
VE7HFR

Rich H · Posted: Tue Sep 23, 2008 3:43 am Post subject:

Sounds good!

Nick on the back of the crank pulley lines up with the pointer on the oil pump.
Bot on the back of the pulley lines up with the pointer on the cam cover. Make sure that the words on the pulley face backwards towards the block, as it is possible to fit the pulley and the flywheel incorrectly...
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

944cabby · Joined: 23 Jan 2007 Posts: 55 Location: UK

Thanks guys!
_________________
1977 martini 924
1983 met claret 924 lux (sold)
1979 burgundy 924 (broke it for spares)

944cabby · Joined: 23 Jan 2007 Posts: 55 Location: UK

Well, she wouldn't fire up after - i checked the plugs and they have a good spark - fuel seems to be getting through but i'll test the injectors tomorrow.
_________________
1977 martini 924
1983 met claret 924 lux (sold)
1979 burgundy 924 (broke it for spares)

Ozzie · Posted: Tue Sep 23, 2008 7:15 am Post subject:

with the oil pump pulley, flywheel and cam pulley lined up did you check the dissy?
The rotor should have been pointing to the lead for no 1 spark plug.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

944cabby · Joined: 23 Jan 2007 Posts: 55 Location: UK

Still won't start - i've checked the injectors and there's plenty of fuel going to the cold start valve on the inlet manifold but nothing coming out of the other 4 injectors - i pulled them all and there's nothing spraying out when you turn the key in the ignition.
Any ideas chaps?
_________________
1977 martini 924
1983 met claret 924 lux (sold)
1979 burgundy 924 (broke it for spares)

wombat · Posted: Tue Sep 23, 2008 8:57 pm Post subject:

vacuum leak. it sounds like, I must admit that I have never checked the cold start valve injector when I have had one so I am unsure of the situation with this one. BUT... if you are getting fuel delivered to the fuel distributor (which you must be if it is coming out of the CSV) but none to the injectors then vacuum is the place to be bro. I have just come out of a monster ordeal with vac on my 77. every time I worked on it I had another one, it would be running fine then wouldnt start, fine then, no start, etc etc. I did all the easy to get to vac hoses early on, then I repaired the fuel distributor boot, then all the hard to get at and smaller (unnoticed) vac lines. then I replaced the inlet boot and while I was at it installed a new distributor boot as I figured that while I was getting the other one I should do it as my repair on it was a little dicey. Good luck the vac system on this car has given me nightmares hopefully it is sorted for another 30 years now.
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1977 924 2.0 Auto

Ozzie · Posted: Tue Sep 23, 2008 9:53 pm Post subject:

did you lift the air metering plate when you checked the injectors?
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

944cabby · Joined: 23 Jan 2007 Posts: 55 Location: UK

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

The points should be closed to fire the ignition. Appears it is too far advanced since it's backfiring. Try turning the dstributor clockwise 1/8th of a turn.

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

944cabby · Joined: 23 Jan 2007 Posts: 55 Location: UK

Thanks Dennis, she's just backfired more than it's done before but the battery has died now so it's on charge - fingers crossed for tomorrow.
Does the fuel distributor on the airbox control the amount of petrol going to the injectors - checking the spark plugs they appear very wet so i wonder if too much is being fed through?
Thanks to all for the help.
_________________
1977 martini 924
1983 met claret 924 lux (sold)
1979 burgundy 924 (broke it for spares)

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

The wet plugs could mean that the ignition firing is way off or you are getting way too much fuel. Is it backfiring into the intake now or is it an afterfire into the exhaust?

If you think it is too much fuel, unplug the cold start valve on the intake plenum and retry starting with the accelerator all the way open.

If the timing is still off, start at square one and check the dot on the cam to make sure it is lined up with the valve cover pointer when the pointer on the oil pump is aligned with the notch on the harmonic balaner. Then check the distributor to make sure the rotor is aligned with the #1 plug wire and the points are closed. Also check the firing order on the remaining plug wires to make sure they are 1 3 4 2 going clockwise on the distributor.

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

944cabby · Joined: 23 Jan 2007 Posts: 55 Location: UK

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

Try removing the plug from the cold start valve and opening the throttle before trying to start it. It's possible the thermotime switch is bad, and causing continous injection of the cold start valve.

Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black