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Join Date: Oct 2002
Location: northwest indiana
Posts: 7
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fuel control unit
i have a 84 944 that is a european model. it was imported to the states in 86. I am having problems with a fuel control unit near the dme. i believe this unit was an add on however it is wired into the dme. the vehicle will stall and has lack of power. i tap on the box and it runs fine. i can not find this unit anywhere to replace it. it is made by dc johnson controls and has part number fac-2 944 on it. One of the wires lead to the o2 sensor. i thought about bypassing it but it is wired into the dme and doesnt idle without it. Any sugestions would be appreciated. wiring diagram would help.
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10-14-2002, 02:41 PM
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Wilk,
What DME input do you think this add on interfaces with?
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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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10-14-2002, 06:42 PM
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Euro944,
Trace the other wires down and tell me which pins on the DME they are hooked to. Most likely intercept the temp sensor or even the speed sensor. If they do you can just bypass the box with a jumper.
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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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10-14-2002, 07:21 PM
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Location: northwest indiana
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thanks for your help you guys. you got me thinking and i decided to pull my wiring harness apart. At the connector harness that plugs into the dme, 4 wires from the fuel control unit were connected. I unscrewed the plastic harness and wahlla (not sure on spelling). I observed that the fuel control unit was spliced into the factory wires with butt connectors. I undid this and connected them as it was originally. The car runs great. I didnt know it had this much power...wow. The car doesnt stall anymore either. Now we'll see if I pass the Emissions test here in Indiana in January. thanks again
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10-18-2002, 08:10 AM
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We were asking if you could identify the wires that were cut and spliced. Either by the colors of the wires or better yet if you pull the plug off of the DME you could tell us which pins these splices were to/from.
Reason: Your state test may fail. Depending on the emmissions levels that are acceptable for your year and make of car. By knowing which input/output this add on device intercepted we can help you and others survive the state tests. If you need a diagram to help identify the DME connector pins let me know.
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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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10-18-2002, 09:34 AM
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Join Date: Jun 1999
Location: Vernon, CT
Posts: 849
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So wait a minuite, let me see if i get this straight.
I have an '84 USA car. If i can get my hands on a euro DME, and replace my US DME with it, i can get additional horsepower, while sacrificing only emissions????? Where do i get a Euro DME? I can always put my USA DME back in for emissions tests, if it doesn't pass with the euro DME. Mike |
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10-18-2002, 10:27 AM
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Just get one of Wilks add on chips. Has one with a switch that can select between the stock configuration and the smoother more oomph chip Wilks provides.
Euro944 is running into a problem with having to have a US Ox sensor. The add-on iterface is giving him problems so by passing this put his car back into running order. A little bit more horses than the US cars. It's getting the car to run right that has impressed Euro944.
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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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10-18-2002, 10:44 AM
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Location: northwest indiana
Posts: 7
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i do not know which pins it is connected to. i didnt see any pin numbers to tell. A diagram would help me to identify them. The wires were splice as follows.
1) brown wire from FCU were spliced into the brown wire from DME 2) pink wire from FCU connected to yellow going to connector 3) red wire from FCU was spliced into red/yellow wire to DME 4) yellow wire from FCU connected to yellow wire to DME the yellow wire coming from the harness was cut and was a dead end i believe As far as more power with a euro DME, I'm not sure if that would work. I believe my power robbing problem was in this add on fuel control unit. By bypassing this and configuring my wires back to stock i increased my power and my stalling problem. |
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10-18-2002, 02:24 PM
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OK. Here's what was done.
The added Ox sensor and it's module takes over control of the engine block temp sensor input to the DME. Brown to brown (DME pins 5, 16 or 17) is of course ground. The red to red/yellow (DME pins 18 or 35) is to pick up power from the DME relay. Pink to yellow (DME pin 13) to the DME connector is the engine temp sensor. This is the engine temp sensor wire. Pin 24 is the input from the Ox sensor with the shield to pin 23. As Wilks mentions this whole circuit may just not be in the euro DME. Not exactly as I would have done. I would have used the engine temp sensor till the Ox sensor heated up and returned a working signal. Then moderated the temp sensor signal based upon both the engine temp and Ox sensor signal. Fail safe would be to fall back on the temp sensor signal. I've searched all of the controls manufacturers and can't find any reference to this module.
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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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10-18-2002, 03:19 PM
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Join Date: Oct 2002
Location: northwest indiana
Posts: 7
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THANK YOU FOR YOUR HELP SO CAL. YOU HAVE A WEALTH OF KNOWLEDGE. I WOULD LIKE TO LEARN MORE ON THIS EURO 944. HAVE ANY SUGGESTIONS ON WEB SITES OR BOOKS. HOW RARE ARE THESE CARS AND WHAT ARE THEY WORTH COMPARED TO USA 944'S
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10-18-2002, 03:37 PM
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Get a copy of the manuals on CDR.
Get a Haynes 944 manual. Then own two 924's for several years. Then own a 944 for 18 plus years. Oh yes being a mechanical engineer specializing in industrial design kind of helps. Keep asking questions being open for the following answers and requests for more information.
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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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10-18-2002, 03:43 PM
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Join Date: Jun 1999
Location: Vernon, CT
Posts: 849
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Socal, where did you find the DME pinout? that's good information, can you post it somewhere?
Mike |
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10-19-2002, 04:52 AM
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1983 Porsche 944 2.5 liter
