Waking up a 17 year dormant 1984 928S
#47
Burning Brakes
Thread Starter
Well, to the shock of absolutely no one that knows these cars at all (which is basically everybody here but me) the test shows I'm not getting a pulse on the #1 injector.
Edit - I just tried it again with a jumper on the fuel injection real way to make sure that I don't have a real problem and no change.
Edit - I just tried it again with a jumper on the fuel injection real way to make sure that I don't have a real problem and no change.
#48
Burning Brakes
Thread Starter
Cleaned the ground on the cam cover near the "O" in Porsche and ran an additional ground to there as well but but still no ignition pulse.
Edit - I should've mentioned that when I jump or the fuel injection re-way I do have 12 V so at least that part of the fuse box is OK.
Edit - I should've mentioned that when I jump or the fuel injection re-way I do have 12 V so at least that part of the fuse box is OK.
Last edited by Socal_Tom; 06-18-2017 at 07:23 PM.
#49
Burning Brakes
Thread Starter
Rechecked both of the grounds on the cam cover on the passenger side and while I was there figured it wouldn't hurt to run secondary grounds to both of those. Please forgive the "I just want to make sure to eliminate the grounding issues" that is going to seer your eyes when you look at this.
Still no injector pulse.
I have not cleaned/replaced the engine ground strap yet but I did run a ground from the engine to here, still no pulse.
Still no injector pulse.
I have not cleaned/replaced the engine ground strap yet but I did run a ground from the engine to here, still no pulse.
#52
Burning Brakes
Thread Starter
Cleaned the front engine bay grounds near the driver side headlight motor.
Cleaned the passenger side connector for the green wire.
No ignition pulse yet.
Cleaned the passenger side connector for the green wire.
No ignition pulse yet.
#54
Burning Brakes
Thread Starter
Check the ICU voltage, 12.06. Battery has 12.54. Not sure if the difference between the two is problematic or not, anyone know?
Replaced the green wire with a new one from 928International, got the distributor and timing back where they were. Fired up based on cold start, but no ignition pulse.
Ugh.
Replaced the green wire with a new one from 928International, got the distributor and timing back where they were. Fired up based on cold start, but no ignition pulse.
Ugh.
#55
Burning Brakes
Thread Starter
One other point - make sure you have a good hot battery. If there is any question as to your battery status - add a second battery at the jumper post up front. There have been several instances where an owner has been chasing a "No Start" condition only to find out that it was a questionable battery or it's ground straps. If there isn't enough of the +12 volts remaining while the battery is being loaded by the starter - the fuel computer will not wake up.
#57
Rennlist Member
Have not read the whole thread... have you swapped out the CPS?
#60
Burning Brakes
Thread Starter
Wondering if there something simple that I'm missing if it's not the CPS. Could someone check me on the relay jumper for the fuel injection relay please?
I made a three pin jumper, have continuity between all three pens, and when I connected like this I have 12 V everywhere.
Edit - for clarity purposes I have 12v always at pin #3 on the board and I am assuming that is 30 on the relay. pin #4 and 5 I am assuming are pins 87 on the relay.
When I connected like this, so it does not have power from 30 I have less than one volt with ignition on run.
I made a three pin jumper, have continuity between all three pens, and when I connected like this I have 12 V everywhere.
Edit - for clarity purposes I have 12v always at pin #3 on the board and I am assuming that is 30 on the relay. pin #4 and 5 I am assuming are pins 87 on the relay.
When I connected like this, so it does not have power from 30 I have less than one volt with ignition on run.