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Fires right up but then dies

my 84 944 will crank and start up fine but then immediately dies like it's not getting enough fuel. I can press on the gas and make hit about 1500 rpms but then the same thing happens. I've cleaned my AFM and was wondering if it could be a clogged or leaking fuel injector. Some of the last cranks i could smell rich gas from the engine, i hope i didn't flood it. Is there anyway of visually inspecting the injectors or fuel pump to rule out the cause? There was no signs of this the when I drove it earlier that morning in the rain.
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1984 Porsche 944 N/A, aka "The Batmobile"
Old 04-20-2011, 04:30 PM
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A couple easy checks:

Use your spare DME/Fuel pump relay. If you do not have a spare make a jumper-
DME Relay Information and Testing

Check the FPR and the FPD for leaks by pulling off the vac hose and looking for drops of gas.

No way to visually inspect the injectors without pulling them out.

A pressure guage on the fuel rail would tell if the injectors are getting enough fuel pressure.

Clarks has a trouble shooting section:
Troubleshooting - Engine

Maybe the car went in a deep puddle and will dry out by morning. It could be an electrical short.

GL
John
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Old 04-20-2011, 08:17 PM
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You know The car will also fire up and die if the AFM is not connected. and if you got a HUGE vac leak. In my case i forgot to connect the vac hose that is behind the Intake Manifold next to were the OIl dipstick mounts
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Old 04-20-2011, 09:57 PM
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This might not be of much help, but I've just got a 924S up and running. It was doing a similar thing according to the PO. By the time I got it it was not even firing a little bit. I thought it was no fuel but actually it was no spark (smell of fuel makes me think you might have a no spark rather than no fuel problem).

On mine, turned out it was a bad DME (water damaged from leaking batt tray) - luckily I had another one to test it (started right up).

The troubleshooting guides on Clark's are extremely useful and easy to follow.

Good luck

Mike
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Old 04-20-2011, 11:51 PM
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Helped a friend of mine troubleshoot his car with the same symptoms recently. Turned out to be a bad DME like MrTibbs pointed out. In my personal experience, once the DME relay goes bad your engine will just turn over and it won't fire at all.
Old 04-21-2011, 07:26 AM
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Since its an early 944, wouldn't it use the same ignition switch as the 924? The one prone to breaking and causing symptoms similar to this:

Turn key, starts, runs, release key, dies.

Just curious. Feel free to correct me if I'm wrong
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Old 04-21-2011, 09:02 AM
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Quote:
Originally Posted by fiat22turbo View Post
Since its an early 944, wouldn't it use the same ignition switch as the 924? The one prone to breaking and causing symptoms similar to this:

Turn key, starts, runs, release key, dies.

Just curious. Feel free to correct me if I'm wrong
IDK if you're right, but I know I do have a new ignition switch in there, it was the culprit to my last no start issue. Can I jump the DME and see if that's the problem?
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Old 04-21-2011, 11:20 PM
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Nevermind, answered my own question, will try to jump the DME.
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Old 04-21-2011, 11:26 PM
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Okay, i jumped my DME with the paper clip method. I heard my fuel pump engaging. Car would fire up but still would die.
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Old 04-22-2011, 03:14 PM
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When it dies, do you still have spark?
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Old 04-22-2011, 03:34 PM
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When it dies, do you still have spark?
I wouldn't you. How would I test for it (sorry for the ignorance)?
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1984 Porsche 944 N/A, aka "The Batmobile"
Old 04-22-2011, 06:40 PM
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Well the easist way - if you have a spare spark plug - is just pull one of the plug wires and hook up the spare plug and sit it on the intake manifold - or somewhere else where it's grounded. Then crank the car over and see if there's a spark.

If you don't have a spare plug, you can insert a screwdriver or something else and sit it so it has a small (maybe 1/8" or 1/16") clearance from a grounding point.

A proper spark will be nice and fat kinda blue.
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Old 04-22-2011, 06:46 PM
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