 Testing D-Jet FI, Got a few questions |
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| Spoke |
 Apr 6 2008, 11:25 PM
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#1
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Jerry  Group: Members Posts: 7,084 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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I'm prepping a 1.8L engine for the red 914 to replace the leaky 1.7L with one cylinder low on compression that's in the car. The installed engine has dual IDF40 Webers on it now.
When the PO bought the car, it had FI and was not running or was not running good. He took it to a local 356 shop and they pulled the FI and put on a single Weber just to get the car running. When the 356 shop moved locations, I received a box full of FI stuff from the car. My goal is to test each component and get the FI running again. I've tested most of the components including the distributor contact points, temp senders, throttle switch, and MPS. For the MPS, I just tested for vacuum leakage. It was leaking pretty badly so I took it apart and sealed it. I'll test it when I test the FI brain. I got a few questions that I'll get to in a few posts. First question is will it damage injectors if they are operated w/o fuel pressure? I plan to run the brain with injectors dry. Here's all the stuff I received: Attached image(s) 
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| Spoke |
Apr 6 2008, 11:39 PM
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#2
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Jerry Group: Members Posts: 7,084 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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To test the brain, I made a temporary harness to go from a battery to the FI. The harness has a fuse, on/off switch (imitates ignition switch) and pushbutton switch (imitates starter).
 To power the brain, I made a connector like the one on the relay board. To make the connector, I started with small strips of 20 or 22ga steel such that each one would fit into the pins of the 4 pin connector to the brain. After soldering wires onto the lugs, I put the lugs in the 4 pin connector, then placed a piece of wood between the rows of pins, then hot-melt glued the spades to the wood. This made a very secure connector for the 4 pin brain power connector. The blue wire will power the fuel pump relay once I put the FI on the engine and attempt to fire it up.  Toggle is on/off control and the red pushbutton is for the starter.  I put red and green LEDs on the harness for status. The red LED lights if the battery is connected backwards. The green LED lights when the on/off switch is on. The fuse is just in case something gets shorted.  |
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Posts in this topic
Spoke Testing D-Jet FI Apr 6 2008, 11:25 PM
Spoke Here's the brain with all its components conne... Apr 7 2008, 12:00 AM Spoke The drill+distributor worked well to show that the... Apr 7 2008, 12:19 AM Spoke Below are some scope traces of distributor contact... Apr 7 2008, 12:35 AM swl wow - creative stuff! keep it coming.
:popc... Apr 7 2008, 06:27 AM root Spoke,
I haven't scoped the injector voltage ... Apr 7 2008, 07:38 AM Bleyseng looks like its working but I would junk the inject... Apr 7 2008, 09:23 AM freezing14 thats a really great set up you have there , but I... Apr 7 2008, 06:31 PM Spoke Root,
Thanks for the info and link. Excellent rea... Apr 8 2008, 03:21 PM Spoke Now to test the throttle contacts.
I did the open... Apr 8 2008, 03:27 PM Spoke Still checking decel operation. With throttle clos... Apr 8 2008, 03:32 PM Spoke OK, now I don't know how to interpret this. My... Apr 8 2008, 03:44 PM
r_towle two things.
Your TPS is out of adjustment, or its ... Apr 8 2008, 09:38 PM |
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