Trouble shooting the Fuel Injection, Checking the volts and resistance on a D-Jet 1.7 '70 |
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Trouble shooting the Fuel Injection, Checking the volts and resistance on a D-Jet 1.7 '70 |
tabs914 |
Oct 16 2009, 01:58 PM
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#1
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Advertise Your Drive... Group: Members Posts: 105 Joined: 17-January 05 From: Gresham, Oregon Member No.: 3,456 Region Association: None |
Hello all... I have been trying to trouble shoot my non-starting 914(just cranks). I figured I would start on the fuel injection system, making sure the ECU is getting the proper signals. Here is what I have checked:
MPS Vacuum: Holds 5 Min. + Main Coil: 56 ohms SPEC: 90 Secondary Coil: 348 ohms SPEC: 350 Injectors: SPEC 3 ohms for all injectors Inj 1: 3 ohms Inj 2: 3 ohms Inj 3: 2 ohms Inj 4: 2 ohms Throttle Position Switch Idle Contact: Spec .5 ohms .68 ohms Head Temp Sensor: SPEC 2k ohms Also it is new... 3k ohms I cleaned the trigger points (I don't know if it was a fluke, but this sparked a stummble for one second, only once) New cap/rotor/points Checked Spark from coil wire (Good) Checked Spark from cap (good) Checked Spark at plug (good) Fuel Pump Primes when key is turned Checked the injectors for pulse (when cranking) Good. New fuel filter and lines (the pump is installed correctly I have checked several times (IMG:style_emoticons/default/smile.gif) The AAR warms up if connected to 12 volt. warm closes and opens when cooled down. (not sure if it should do this if I just turn the ignition on? - doesnt seem to warm up if I do.) New vacuum lines backed up with clamps on all connections I can't check fuel pressure - I don't have a guage nor for compression either. Anyone in Portland, Oregon or Vancouver, Washington I can borrow from? (IMG:style_emoticons/default/smile.gif) Maybe someone in the area that can help me out, would be very cool. I am learning alot, but this has me stumped. I haven't had her on the road yet, but I had this baby running pretty well. I was messing around with the head temp sensor when it died. I thought maybe the wire lead became damaged within the sensor casing? Bought a new sensor with no effect. I have three ECU's and I know two work (no effect) The triggers seemed to sparked a stumble, they look ok... any way to test them? Thank you for your help. (IMG:style_emoticons/default/biggrin.gif) Tab |
tod914 |
Oct 17 2009, 02:07 PM
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#2
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Advanced Member Group: Members Posts: 3,755 Joined: 19-January 03 From: Lincoln Park, NJ Member No.: 170 |
You should be able to peek in the tank with a light and see if the filter sock is clogged. The AAR works off of the same fuse as the pump. But, it would more than likely blow the fuse if it was shorting out. Couldn't hurt to unplug the AAR to test. Sound like a clog or misrouteing. You mentioned in the other thread the fuel system was removed. You can try swapping the lines inside the engine bay by the battery tray where they attach to the plastic lines (feed and return). If they are swapped, you will not get pressure. Pelican has a fuel routing diagram too if you need it.
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