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vacuum diagram
anyone have a vacuum diagram and an electrical diagram for the DME for the 85.5 944?
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85.5 944 N/A, auto |
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12-24-2003, 07:14 PM
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Search the past posts in this forum for the vacuum diagrams.
Pelican had the early electricals: http://www.pelicanparts.com/944/electrical/944_electrical_diagrams.htm A lot is the same with the later 944's. What exactly did you need?
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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12-24-2003, 08:09 PM
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the fuel damper and the fuel pressure regulator have a three way connector on them... the fuel damper has one of them unplugged and i cant find where it goes... and there is a plastic nipple coming off the thermostat housing i have the rubber hose that goes on it but i cant find wher that goes either... and the injection problems i am having have been traced to somewhere in the DME harness going to the DME.. was wanting a diagram of where the wires go from the DME
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12-25-2003, 10:02 AM
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the FPR and Damper both go to the same hose (the 3 way) and that ties into a nipple on the throttle body.
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*Disclaimer: The person above is actually dumber than he appears. my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements '84 944 auto/ps/ac/cc '86 951 Providing ignorance one post at a time. |
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12-25-2003, 10:44 AM
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the vacuum operates both of them.
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*Disclaimer: The person above is actually dumber than he appears. my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements '84 944 auto/ps/ac/cc '86 951 Providing ignorance one post at a time. |
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12-25-2003, 10:44 AM
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Most of the injector harness problems I've seen over the years are in the engine compartment. If you start pinching the harness just aft of #4 injector and proceed toward where it comes out of the larger harness you can feel the crip connectors where the wires split. It's at these crips that I've seen the wires break. Both sides of the circuit has these crips.
You have isolated it to the DME side of the circuit?
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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12-25-2003, 12:20 PM
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yes.. had the DME tested its ok.. tested the reference sesor and it was ok... isolated it to a faulty ground somewhere.. getting enough voltage.. just not a sufficient ground.. was wanting the DME diagram to see which wires are the grounds so i can check them for breaks
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12-25-2003, 03:38 PM
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I don't quite understand. The DME grounds to the chassis. The injectors are fired by the DME grounding the injectors. The injectors and the DME get their 12 VDC from the first set of contacts in the DME/fuel pump relay.
If the DME and is being powered through the DME relay (you should hear the fuel pump run for a half second after you stop cranking) then you should find 12 VDC on one of the pins on any injector connector. You may see about 10 volts on the other pin but this is through the other injectors if they are still connected. The pins on the DME plug that go to the injectors are # 14 and 15. Here is a graphic of the connector on the end of the harness at the DME. 
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! Last edited by SoCal Driver; 12-25-2003 at 05:44 PM.. |
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12-25-2003, 05:38 PM
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if the DME isnt bolted to the body.. will that not allow a sufficient ground to occur? because i have it loose and laying in the floorboard... the car is still doing the start and die thing.. but will run with one injector unplugged (doesnt matter which one)
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12-25-2003, 06:51 PM
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Well yes there is a ground to the DME through the harness but this goes to a chassis grounding lug under the dash IIRC. Might even be the connector housing.
A 944 that will not run unless one of the injectors is disconnected is because of high fuel pressure usually due to a fuel regulator failure. The fuel regulator is the one with the hose clamp. The reason this is possible is not that the DME is improperly grounded but that the injectors are designed to open within a narrow fuel pressure range. By taking one of the injectors out of the circuit the other three divide the avalable current. This gives them enough ooph to over come the higher fuel pressure. Check that your vacuum lines are correct on the FPR and FPD. Did you find the previously posted vacuum line diagrams?
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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12-25-2003, 08:20 PM
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i searched and didnt find them... found them for the early 944.. i have replaced the fuel pump, press regulator, damper, dme relay... replaced everything i thought it could be.. then started tracing wires... been doing this for almost 2 months now lol
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12-25-2003, 08:50 PM
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also another wierd thing it does... if you run 12v directly to the pump and pressurize till the pump cavitates and disconnect the 12v the the fuel pump it will run on all 4 till it runs low on pressure
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12-25-2003, 08:52 PM
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Went back and reviewed your threads. I don't think I would be laughing about this.
Here is the vacuum diagram for the 85.5 and later. See if it helps. 
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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12-25-2003, 08:59 PM
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just from looking at this i see 2 hoses that arent even on the connected to the engine and 1 run to the wrong place... (wondered what G was and why nothing was connected) its at the point were either laugh about it or shoot it
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12-25-2003, 09:07 PM
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would G and H not being connected make this problem?
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12-25-2003, 09:09 PM
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Notice which side of the throttle butterfly these hoses connect to. If you have the FPR on the wrong side of the throttle you could have the probems you describe. No vacuum.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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12-25-2003, 09:15 PM
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will check it tommorow afternoon after work... i really appreciate the help and the patience yall have had with me!!!!
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12-25-2003, 09:19 PM
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SoCal ..... ( or anyone else )
would you by chance have a diag for the 85- vac system ???? I have not seen one in my travels. Thanks Don __________________ 1984/85 944na Gold exterior / Black interior Los Angeles / San Diego Lookin for ideas etc... 
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12-25-2003, 11:11 PM
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Don, I think the one that Dave found by searching is one I posted for the early 944's. Search and let me know if you find it.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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12-26-2003, 09:21 AM
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1983 Porsche 944 2.5 liter
'84 Porsche 944 2.5L
