Trouble shooting the Fuel Injection, Checking the volts and resistance on a D-Jet 1.7 '70 |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Trouble shooting the Fuel Injection, Checking the volts and resistance on a D-Jet 1.7 '70 |
tabs914 |
Oct 16 2009, 01:58 PM
Post
#1
|
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 |
tabs914 |
Oct 17 2009, 06:24 PM
Post
#2
|
Advertise Your Drive... Group: Members Posts: 105 Joined: 17-January 05 From: Gresham, Oregon Member No.: 3,456 Region Association: None |
GOOD NEWS (IMG:style_emoticons/default/piratenanner.gif) The spark looked a little weak, so I replaced the coil and she started right up. Seems to be running a bit rich though. I checked the plugs and they are covered with carbon powder. I have only checked one of them so far...
|
Lo-Fi Version | Time is now: 24th September 2024 - 01:00 PM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |