New 924 Owner Trying to Fix it
04-03-2024, 08:50 AM
#18
Good news, I have fuel pressure! See video
Bad news, I have a fuel leak.
I am thinking that, because the car is old, maybe the K-Jetronic is a bit dirty, and thus the fuel pressure is all going in the leak rather than in the distribution system, thus no fuel reaches the engine. I'll fix that and see if it fixes the car overall. I also hotwired the car as suggest, but I noticed no difference (apart that it is wicked to hotwire, feels like a 80s film)
Bad news, I have a fuel leak.
I am thinking that, because the car is old, maybe the K-Jetronic is a bit dirty, and thus the fuel pressure is all going in the leak rather than in the distribution system, thus no fuel reaches the engine. I'll fix that and see if it fixes the car overall. I also hotwired the car as suggest, but I noticed no difference (apart that it is wicked to hotwire, feels like a 80s film)
04-04-2024, 12:40 PM
#19
Update:
I fix the leak. Now the K-Jetronic makes a noise again, so fuel is getting inside.
Problem, no difference on the engine's behaviour. I'm guessing there's no spark.
Any suggestion on where I should check next?
I'm thinking about sending starter fluid down the intake manifold. That would tell whether there's spark or not, and whether the K-Jetronic is at fault or not.
I fix the leak. Now the K-Jetronic makes a noise again, so fuel is getting inside.
Problem, no difference on the engine's behaviour. I'm guessing there's no spark.
Any suggestion on where I should check next?
I'm thinking about sending starter fluid down the intake manifold. That would tell whether there's spark or not, and whether the K-Jetronic is at fault or not.
04-06-2024, 07:31 AM
#20
Update:
I've send staring fluid down the intake manifold while a friend cranked the engine, and nothing.
This leads me to believe that the engine has no sparks.
Time to double check the whole ignition system. Actually pretty happy about that because I don't have to rebuild a 1970 injection system.
I've send staring fluid down the intake manifold while a friend cranked the engine, and nothing.
This leads me to believe that the engine has no sparks.
Time to double check the whole ignition system. Actually pretty happy about that because I don't have to rebuild a 1970 injection system.
05-04-2024, 07:50 AM
#21
Update
Hello there everyone, it's been a while but I am now free to work on my Porsche full time.
A little bit of updates:
- I fixed a timing issue on the camshaft, as it wasn't sync with the crankshaft.
- I fixed the fuel pump (somehow), as now it starts with the ignition on)
- I dug a little more and this is the subject of the update:
I found on the 924board something about the ignition coil and whether is should have current and voltage when ignition's on.
Turns out mine has current when ignition's off, but when ignition on, it no longer has current.
Furthermore, instead of having 6V on 15 with ignition on, the ignition coil has 11V.
I don't really know what to do from now one. Should I put in a new ignition coil or should I dig more to find a cable issue?
I tried sanding the grounding points to be sure there's no issue there, and I did the same with most connections as it seemed a good thing to clear the connections.
Additionally:
- The RPM gauge doesn't move when trying to start.
- Already asked on 924board.org if they have an idea.
A little bit of updates:
- I fixed a timing issue on the camshaft, as it wasn't sync with the crankshaft.
- I fixed the fuel pump (somehow), as now it starts with the ignition on)
- I dug a little more and this is the subject of the update:
I found on the 924board something about the ignition coil and whether is should have current and voltage when ignition's on.
Turns out mine has current when ignition's off, but when ignition on, it no longer has current.
Furthermore, instead of having 6V on 15 with ignition on, the ignition coil has 11V.
I don't really know what to do from now one. Should I put in a new ignition coil or should I dig more to find a cable issue?
I tried sanding the grounding points to be sure there's no issue there, and I did the same with most connections as it seemed a good thing to clear the connections.
Additionally:
- The RPM gauge doesn't move when trying to start.
- Already asked on 924board.org if they have an idea.