daniels740
Member
- Joined
- May 8, 2019
- Location
- South Florida
On Friday morning last week, my '89 744T refused to start. It cranked as normal, but wouldn't start. It had spark but I was pretty sure the fuel pump wasn't running.
So, I swapped the fuel pump relay. It wasn't immediately after, but after a little more fiddling and pushing in the new relay that the engine started. After that, it ran fine. I drove a couple miles, parked, then started back up just fine and made my way home.
The next day, Saturday, it also started and drove fine. Sunday, I just left it parked and didn't touch it.
Now, Monday morning, the battery was randomly drained. Power locks still worked but it didn't have enough juice to crank. I tried jumping but couldn't get a good enough connection with the jumper cables for it to crank over fast enough.
Very strangely, after I stopped cranking with the cables connected, I heard a click-click-click-clicking noise coming from around the intake. Removing the injector ballasts, the clicking stopped, which likely means it was the injectors firing, as if the engine was running; except that the key was completely out of the ignition. The fuel pump wasn't also running.
What could this be? ECU gone bad?
I'll try a different battery tomorrow and see if it'll start when it can crank properly.
So, I swapped the fuel pump relay. It wasn't immediately after, but after a little more fiddling and pushing in the new relay that the engine started. After that, it ran fine. I drove a couple miles, parked, then started back up just fine and made my way home.
The next day, Saturday, it also started and drove fine. Sunday, I just left it parked and didn't touch it.
Now, Monday morning, the battery was randomly drained. Power locks still worked but it didn't have enough juice to crank. I tried jumping but couldn't get a good enough connection with the jumper cables for it to crank over fast enough.
Very strangely, after I stopped cranking with the cables connected, I heard a click-click-click-clicking noise coming from around the intake. Removing the injector ballasts, the clicking stopped, which likely means it was the injectors firing, as if the engine was running; except that the key was completely out of the ignition. The fuel pump wasn't also running.
What could this be? ECU gone bad?
I'll try a different battery tomorrow and see if it'll start when it can crank properly.