My 2004 Allroad 4.2 V8 Audi

Asked by MarinoBlack76 Jul 15, 2020 at 03:46 PM about the Audi A4 Allroad

Question type: Maintenance & Repair

My 2004  Allroad 4.2 V8 Audi starts
and runs fine but after I turn it off if
I turn it back on immediate bit
starts. but if I turn it off and let it sit
for few minutes won't start again
but switch turns on except there is
no engine lights showing it just
won't start again
What could be it's problem

1 Answer
370

cripp_cg answered 3 years ago

Fuel pump or Crank Position sensor. A failing CPS will have issues during a warm start after its been heat soaked. I’d try swapping this first with a quality part from FCP Euro A failing pump with a bum check valve may also cause this condition. A weak / old pump might not be able to regenerate adequate fuel rail pressure once it’s hot (and the check valve that’s bad has let it bleed back into the tank). From an electronics perspective, heat = resistance. So a weak pump might have issues once it’s warmed up

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