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Registered User
Join Date: Sep 2011
Posts: 18
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944 starts then stops
I have an 84 944 that will start then stop after running around one second. This problem comes and goes but it is here now and the car will not run. I have replaced the fuel pump relay with no help. The sensors are new. I have also checked the fuel pump by taking off the rail plug and checking the output. I don't know were to go from here. Can anyone help????
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10-11-2011, 01:35 PM
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Registered
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Have had similar problem,are you getting full voltage @ the pump? Bosch pumps are voltage sensitive and stop running if the drop is too great.
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10-11-2011, 02:12 PM
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Registered
Join Date: Mar 2008
Location: Chicagoland
Posts: 2,695
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make sure the AFM is connected. might be a bad AFM also
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10-11-2011, 02:24 PM
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Registered User
Join Date: Sep 2011
Posts: 18
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So what is the AFM and were do I find it and once found I do I test it?
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10-11-2011, 03:07 PM
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Back from Beyond
Join Date: Nov 2004
Location: Alberta, Canada
Posts: 2,697
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Classic bad AFM symptoms, as krystar says.
AFM=Air Flow Meter. It's the gubbins right beside the air box that measures the airflow into the engine via a sprung 'barn door' inside it. To find it, locate the air box and the J-boot (looks like it sounds), and it's attached to both, right between them. There's a connector on its side - check there for a bad connection. Try FRwilk's website for testing and mods.
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'88 944 Auto - project, kinda '87 944 Auto - died saving my wife '84 944 5SP - crushed under shop roof during snow storm All others GONE! |
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10-11-2011, 03:42 PM
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Registered User
Join Date: Sep 2011
Posts: 18
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ok so I took the AFM connector off and sprayed it with electrical contact cleaner. The car started right up after this. Is this enough or should I test the AFM? The connector did not look dirty and the problem does come and go. I have a Haynes manual and there is a test procedure but they do not tell you which is the #9 pin. Should I go to FRwilk's as mentioned above. I don't trust it yet. What do you guys think?
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10-11-2011, 04:23 PM
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Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,833
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This is the same problem you had in your first post:
http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/630978-84-944-starts-then-stops-about-two-seconeds.html AFM is always a good place to start. You mentioned you have new sensors. DO YOU have TACH BOUNCE when you grind the engine to start? No tach bounce means the DME computer is not getting a signal from the reference sensors. The tach needle has to "bounce" 1/16th" of an inch when you crank. New sensors may be bad or the wires to the DME need to be checked. Did you check the sensor GAP? Are the pins on the flywheel clean and not coated with oil? Are the pins damaged? Here is a wire checklist to the DME 35 pin connector: http://forums.pelicanparts.com/5676317-post5.html Have you checked the rotor to make sure it is on tight? The coil is seldom the problem but the coil wire may be damaged. GL John
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1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo) |
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10-11-2011, 04:27 PM
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Proprietoristicly Refined
Join Date: Jul 2001
Location: ~Carefree Highway~
Posts: 5,833
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A little late...
Glad to hear you got it running. John
__________________
1988 924S, 85,750K ..+ 1987 924S, 154K DD (+15K est. bad odo) |
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10-11-2011, 04:29 PM
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Registered
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Standard reply
John have you every thought about a standard "944 no start reply' you could use? all you would have to do is add various new scenario's as they come up,top marks to you always on the mark,cheers
P.S could you help me with my no start post please ,please 
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10-11-2011, 11:46 PM
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Porsche 914
The tractor
