924Board.org

red924 · Joined: 13 Oct 2003 Posts: 281 Location: London, England

hi all,

as you may recall from my prevouis posts ive been having probs with my 924 as of late, ive basically gone through all the common probs listed on the site and suggested, and it still does not start, its got spark, the fuel pump works, theres gas in there, it even turns over fine, but still does not start, im going back to work this weekend (work 7 dayes a week) so would really like to get it up and running before then, does any one have any ideas as to what it can be? im going to check the fuel filter today as i read somewhere that the tank might be rusted and this could cause it not to start, but i can smell petrol in the engine so i doubt its that, ive called a few garages and they have no idea either, it would be shame to break the car but if i dont get it up and running soon im gonna do this i think

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1980 Red 924 CARRERA GT(rep) with custom leather interior + GT goodies!
Click on link 4 pics! http://www.924board.org/viewtopic.php?t=12422

5150 · Posted: Wed Aug 04, 2004 11:25 pm Post subject:

bad earth or other lead somewhere.. timing out..

is it even trying to fire at all when you're cranking it over?

it's a mare when something goes wrong and you can't nail the problem down, been there a few times... just keep plodding through the everything step by step. might be worth starting from scratch and checking each individual item in turn again. is it possible the coil isn't chucking a strong enough jolt out? i had a mini that was sparking but simply wouldnt run at all, changed everything and the last thing was the coil - soon as the new coil went on it fired up no prob...
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Mars Red '78 Euro 924 n/a
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Graphite? Grey Metallic '85 (late model) 944 2.5

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CMXXXI · Joined: 05 Nov 2002 Posts: 1939 Location: Vicksburg, MS

Back to the basics... You hear the fuel pump when you turn the key - have you jumpered the relay to eliminate the relay as being potentially bad? What is the spray pattern and volume at each of the injectors? You say you have spark, what condition are the plugs (and cables) in? Have you double and triple checked your timing marks? Is the cold start injector getting juice on a cold-start attempt? I'm unfamiliar with what ignition electronics you have on the '80 ROW, so something there may be amiss but I'm not the one to help diagnose problems in that department.

Even with vacuum leaks and some other things being out of kilter, the 5th injector should still provide enough fuel to at least get the engine to cough and sputter and run (roughly) for a few seconds - time after time. If you can get the motor to run for a few seconds, then as a "last resort", you can start isolating things by seeing if spraying starter fluid (ether) into the airflow metering box will keep the engine running. If this works, and you can "play with" the throttle and spray at the same time to keep the engine running, you will have at least confirmed it's a fuel issue instead of an elecrical one.
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'79 Eurospec 931

Eturbo924 · Joined: 09 Nov 2002 Posts: 2212 Location: Londonderry NH

Get some starting fluid and spray it into the intake.

If your engine does not fire up with that in there then you have no spark.

And or your cam timing is 180 off and you are tryig to fire a cylinder when the valves are open... it that is possible.

Anyway if you have both fuel and spark then you should have explosion... even if rough.

So it is one or the other in my mind... so spray in starting fluid and have it a go.

Eric
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Joes924Racer · Posted: Thu Aug 05, 2004 10:10 am Post subject:

the fuel pump runnen maybe the fuel relay by pass it by taking it out and jumpin it there.
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Lizard · Posted: Thu Aug 05, 2004 10:54 am Post subject:

tell you what pay for my ticket to come over for a week so I can visit my family over there, and I will fix your car for yah,

check that your timing belt hasnt slipped a tooth make sure the marks line up.
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augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

Check your spark plug wires to make sure they are connected in the right order.
This worked for me----PO had them all screwed up. They were all off by 1 position.
Have someone turn the car over and turn the distributor back and forth slowly by hand .If it starts, or attempts to start, look there as your problem. Good luck, its all worth the trouble so hang in there.
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red924 · Joined: 13 Oct 2003 Posts: 281 Location: London, England

cheers for the advice guys, ive tried by passing the fuel pump relay as well, didnt work, its very disapointing as the weather over here is great right now and it would have been nice to get the porsche out for a spin.

i think i will get the ignition coil and fuel filter maybe that will help, then i will go through the other things suggested, i re-did the earths but although it turns over much stronger still dont start, for some reason it sounds like it wants to start when i stop turning it over, this is also when the spark is a bit stronger, the car was jus serviced about 2 months ago so leads, sparks, oil, dizzy cap and arm, etc is all new, even passed MOT like that.

@lizard if i had the money man i would pay for ur ticket myself

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Click on link 4 pics! http://www.924board.org/viewtopic.php?t=12422

Chrenan · Joined: 15 Jan 2003 Posts: 3903 Location: Canada

So you jumpered 30 and 87 on the fuel pump relay connection and the fuel pump didn't run? Or did the fuel pump run but the car still wouldn't start?
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Smoothie · Posted: Fri Aug 06, 2004 1:07 am Post subject:

Lizard · Posted: Fri Aug 06, 2004 4:31 am Post subject:

actually if the car sounds like it wants to start but doesnt try this, while you have a friend cranking grab a short piece of wire and touch this wire between the positive on the battery and the positive terminal on the coil, do this while someone else is cranking the car, and see if it fires up and runs with this jumper, if it does and the car dies as soon as you remove this jumper wire from the coil, then you need to be looking at either the ignition control module (front left corner of engine bay small silver box) or the wiring going to it, make sure it has a good switched wire getting to it (will need haynes to look at), as it is possible that the booster wire between the starter and the coil is the reason you see spark when you are cranking it over, but you cant check for spark when in "run" position.
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red924 · Joined: 13 Oct 2003 Posts: 281 Location: London, England

cheers i will give both those ideas a go, ive replaced the relay and also jumpered it before hand, and although i can hear it buzzing the car still doesnt start, the spark also seems very weak which is why i reckon it might be the coil, but even so im sure it would at least tru and fire up, right now it just turns over for ever
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1980 Red 924 CARRERA GT(rep) with custom leather interior + GT goodies!
Click on link 4 pics! http://www.924board.org/viewtopic.php?t=12422

red924 · Joined: 13 Oct 2003 Posts: 281 Location: London, England

hi all if i am facing the engine from the front which side is the positive terminal on the coil?

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1980 Red 924 CARRERA GT(rep) with custom leather interior + GT goodies!
Click on link 4 pics! http://www.924board.org/viewtopic.php?t=12422

5150 · Posted: Tue Aug 10, 2004 2:53 am Post subject:

Doesn't matter which way around it is... as long as the leads are correct - negative to the condensor on the dizzy mate...

Just been out in the damned rain to check too.. man where's our summer?!

+ terminal is on the right on mine and - terminal is on the dizzy side btw...
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Mars Red '78 Euro 924 n/a
http://www.cardomain.com/id/5150_uk

Graphite? Grey Metallic '85 (late model) 944 2.5

There are two kinds of pedestrians: the quick and the dead.

Smoothie · Posted: Tue Aug 10, 2004 3:25 am Post subject:

You should find one terminal is numbered 15, the other is 1.
#15 is normally to the right when viewed from the front of the car looking back if it's the original style Bosch coil installed with label facing forward. #15 is positive.
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