I have a 2015 Audi Q7 S-Line Prestige. Sometimes it cranks but doesn’t start. Other times it’s a slow start. The other day it wouldn’t accelerate on a flat surface.
What is your question?
No noticeable sounds. Anyway, I have 2 fuel pumps: a High pressure and a Low pressure. How do you tell the difference between a bad high pressure field pump vs a bad low pressure fuel pump?
What makes this problem better or worse?
Pressing the accelerator while cranking. Also, when it wouldn’t accelerate, I pulled over and put it in park, then the car accelerated again.
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A bad high-pressure fuel pump totally can cause symptoms like difficulty starting, especially during cranking, and poor acceleration. It's responsible for delivering pressurized fuel to the fuel injectors. A bad low-pressure fuel pump, on the other hand, may cause similar symptoms but typically affects fuel delivery to the high-pressure pump.
A fuel pressure test can help diagnose which pump is faulty. If the pressure is low before the high-pressure pump, the issue may be with the low-pressure pump or the fuel filter if there is one. If the pressure is low after the high-pressure pump, the high-pressure pump may be faulty.
Consulting a professional mechanic with diagnostic equipment is recommended for accurate diagnosis and repair.
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