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> Trouble shooting the Fuel Injection, Checking the volts and resistance on a D-Jet 1.7 '70
tabs914
post Oct 16 2009, 01:58 PM
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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
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Posts in this topic
tabs914   Trouble shooting the Fuel Injection   Oct 16 2009, 01:58 PM
type47   Trigger points are just basically on-off switches,...   Oct 16 2009, 03:15 PM
tabs914   Trigger points are just basically on-off switches...   Oct 16 2009, 03:24 PM
aircooledtechguy   3k at the sensor or at the ECU? Disconnect the...   Oct 16 2009, 03:35 PM
tabs914   3k at the sensor or at the ECU? Disconnect th...   Oct 16 2009, 03:58 PM
underthetire   Harbor freight sells a fuel pressure tester. It...   Oct 16 2009, 03:22 PM
tabs914   Harbor freight sells a fuel pressure tester. It...   Oct 16 2009, 03:25 PM
type47   2-3k ohms according to: http://www.914world.com/b...   Oct 17 2009, 08:27 AM
John Jentz   The D-Jet "Bible" http://members.rennli...   Oct 17 2009, 08:44 AM
swl   The D-Jet "Bible" http://members.rennl...   Oct 17 2009, 11:55 AM
BMXerror   This may be way basic considering tests that you...   Oct 17 2009, 10:06 AM
sean_v8_914   ...did you check for spark at a plug?   Oct 17 2009, 10:29 AM
tabs914   Thank you all for your suggestions... I really app...   Oct 17 2009, 12:07 PM
swl   sounds strange. if you hear the pump it should be...   Oct 17 2009, 12:13 PM
tabs914   sounds strange. if you hear the pump it should b...   Oct 17 2009, 12:29 PM
swl   one thought... The three port pumps have a fail m...   Oct 17 2009, 12:23 PM
tabs914   one thought... The three port pumps have a fail ...   Oct 17 2009, 12:30 PM
tabs914   I can't hear any gurgling...   Oct 17 2009, 01:36 PM
Jacob   Can you pull the lines leading into and out of the...   Oct 17 2009, 01:51 PM
tod914   You should be able to peek in the tank with a ligh...   Oct 17 2009, 02:07 PM
tabs914   You should be able to peek in the tank with a lig...   Oct 17 2009, 04:43 PM
BMXerror   When you checked for injector pulse, did you actua...   Oct 17 2009, 02:22 PM
BMXerror   Sorry. Didn't see your post about not being ab...   Oct 17 2009, 02:37 PM
tabs914   Sorry. Didn't see your post about not being a...   Oct 17 2009, 04:41 PM
swl   Sorry. Didn't see your post about not being ...   Oct 17 2009, 05:04 PM
tabs914   I'll go check again... should the pressure dro...   Oct 17 2009, 05:14 PM
swl   yep - nothing to hold it up.   Oct 17 2009, 05:34 PM
tabs914   Sorry miss read...28-29 and the gauge has a small ...   Oct 17 2009, 05:42 PM
tabs914   GOOD NEWS :Qarl: The spark looked a little weak, ...   Oct 17 2009, 06:24 PM
BMXerror   GOOD NEWS :Qarl: The spark looked a little weak,...   Oct 17 2009, 06:36 PM
tabs914   GOOD NEWS :Qarl: The spark looked a little weak...   Oct 17 2009, 07:11 PM
swl   If the cht was failing that might account for the ...   Oct 18 2009, 06:39 AM


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