2003 Disco starving for fuel?
I had to pull the relay out to check for amperage. How do I check it with it in? Also, previously I checked for voltage at the pump, and got 12. I just checked, and I had .4v... But I don't think it would be able to idle with that little of voltage. Where is the ground for the fuel pump generally located? Although, I can charge the pump with a 12v battery directly, and it still doesn't improve.
It sounds like you'll need to use a scan tool with live data. I would pay close attention to the engine coolant temp sensor, the throttle position sensor and the fuel trims. I have definitely seen coolant temp sensors cause problems just like this.
Also, make sure you get a good spike on the MAF when you do a throttle snap test. MAF sensors also have the intake air temp sensor built into it. Make sure you check that out too.
Last edited by disc oh no; Aug 6, 2016 at 10:51 PM.
Hooked up a fuel pressure gauge to the rover today, and when the pump kicked on to prime it charged to 46 psi. When I started it, it ran from 56-60 psi. It seems like my pump is running correctly.
I don't know if I've used one. The one I use at home is an Actron it works pretty good. The one I use at the shop I work at is awesome. It has bi-directional controls and factory data. That's not always necessary though. Especially for home use. Mine has pretty much everything I need. It was about $200.
Got a scanner coming from eBay. Used Bosch 1150 for $65. Live data, with graphs, some other stuff I'll probably never use, or understand, but I will have data to post in a few days.


