AntonioF25

VW Golf GTI Performance Stalling and Shaking Issues

I own a 2018 VW Golf GTI Performance (mk7.5) with 81,436 km and I'm experiencing stalling and shaking while idling. I received a fault code P008700 indicating 'Fuel rail pressure too low'. To address this, I've upgraded the high-pressure fuel pump and replaced the fuel rail pressure sensor. My car is running a stage 1 pops and bangs map, with a Milltek downpipe, GPF delete, backbox delete, and Revo air intake. Despite these changes, the car sometimes stalls when idling, especially when hot, and the revs fluctuate. It's a DSG model. Any thoughts on what could be causing these issues?

5 comment(s)

Check the low-pressure fuel pump and fuel filter for any blockages or issues, as they can affect fuel delivery to the high-pressure system. Ensure the fuel lines are not kinked or damaged. Let me know if this helps or if you have any further questions.

Quotation:
@CarlyMechanic wrote on
Check the low-pressure fuel pump and fuel filter for any blockages or issues, as they can affect fuel delivery to the high-pressure system. Ensure the fuel lines are not kinked or damaged. Let me know if this helps or if you have any further questions.

I have thought of that as well however the car would run fine for 2-3 days, then fluctuate on idle the 4th day and then run fine again and so on. Wouldn’t a blocked fuel filter give a constant issue?

Quotation:
@AntonioF25 wrote on
I have thought of that as well however the car would run fine for 2-3 days, then fluctuate on idle the 4th day and then run fine again and so on. Wouldn’t a blocked fuel filter give a constant issue?

Intermittent issues like this can sometimes be caused by electrical problems. Check the wiring and connectors related to the fuel system for any signs of corrosion or loose connections. Pay special attention to the ground connections. Let me know if this resolves the issue or if you need further assistance.

Quotation:
@CarlyMechanic wrote on
Intermittent issues like this can sometimes be caused by electrical problems. Check the wiring and connectors related to the fuel system for any signs of corrosion or loose connections. Pay special attention to the ground connections. Let me know if this resolves the issue or if you need further assistance.

Any idea which connector I should start with first?

Quotation:
@AntonioF25 wrote on
Any idea which connector I should start with first?

Start by inspecting the connectors at the fuel rail pressure sensor and the high-pressure fuel pump, as these are directly related to the fault code you received. Make sure they are clean, secure, and free from corrosion. Let me know how it goes or if you have more questions.

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