I pulled the pump last night. For some reason there was a few aluminum shavings in there but that’s it. The filter is also new. There is a return regulator in the pump housing. It’s starting to sound like that is stuck open, if it can’t sense fuel returning to the tank from the fuel filter it keeps pumping.might be worth checking the sock on the fuel pump for debris/dirt. Also fuel filter...
It’s an APR GTC wing and I absolutely love the way it looks.Your wing mounts look great! Tell us more about the wing - which one is it? I see how you modified the stock uprights. The pieces that bolt to the wing - did those come with the wing or did you fab those?
Just went out and checked the same terminals on my pump... same result... ~ 0.5 ohms.
That’s interesting. I have a new set of plugs but I’ve heard that the fuel pressure issues can cause misfires. So I plan to focus on fuel pressure problem first. I bought nice NGK iridium plugs one step colder than stock. They’ll go in just as soon as I have a consistent 60psi at the rail.When you swapped the coil pack did you swap the plug with it?
I had the same issue with my Audi TT. New plugs and less than 1k miles and got a misfire in one cylinder.
Diagnosed to a cylinder. Swapped coil packs, no change.
Swapped plugs and followed the plug.
Found that the ceramic surrounding the center electrode cracked, sliding up and down.
Researched the plugs and found that some brands and models are sensitive to boost. The plugs I installed were one of those listed.
I haven’t swapped the injectors just yet because my main concern is getting fuel pressure corrected.Have you tried swapping the injector from cylinder #4 to another cylinder to see if the misfire follows? Like you said, it could be a bad injector, not fully seating when closed.
Did the plug look rich, wet or smell of fuel?
I was thinking, if your overall fuel pressure was off, that you'd have misfires in all cylinders.
Would the misfire disappear if you brought the RPM up? Or remain?
Sorry for all the questions.
I am comparing now. Some things are changed and some arent. Im going one by one and trying to learn what each parameter does.You may be able to log fuel pump control (duty cycle) with your tuning software. Some ECUs vary the output level to control fuel pump pressure.
At idle, I'd expect to see a constant number as well as a constant rail pressure. Initially I would suspect an electrical problem, but that wouldn't necessarily go away off idle.
I wonder if you can compare calibrations between stock and the one you are running now.
Gauge worked perfectly fine before the turbo, I know its high because it blew one of the fittings off. Have not done compression test, how could that affect fuel pressure?What is the voltage at the pump when running? Have you tried another gauge?
Has a compression test been taken?
Brad