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Hesitation when accelerating, only when first starting the c

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Old Jun 1st, 2020, 20:16   #1
Virtus36
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Default Hesitation when accelerating, only when first starting the c

Hi, I have a problem with acceleration (2004 S60 2.5T). When the car is first started, regardless of whether the engine is hot or cold, I get this stuttering hesitation.

I can get rid of it by accelerating at full throttle for a few seconds, eventually bringing back full power. It's strange, it almost feels like it unblocks something. The problem will then not come back until I switch off the engine and start it again. Even if I only switch off for a few seconds, it happens again every time.

My car has the plastic 'saddle' tank but does not have a PEM. Also does not have a pressure sensor on the fuel rail. I have replaced the fuel filter but the problem persists. Also cleaned ETM.

I am getting the dtc code P1234 (fuel pump driver module off line). As I said, I don't have a PEM on this car so I assume this is all handled by the ECM.

I would be very grateful if anyone has any ideas.

Thanks.
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Old Jun 2nd, 2020, 21:27   #2
deanosabby
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I had this and changed the TCV just a few days ago and all is good now.
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Old Jun 5th, 2020, 14:20   #3
barrybritcher
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If you havent looked, take off the VVT solenoids see if the green gasket filter is clogged.

the car cant breathe properly with VVT inactive and becomes sluggish
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2001 Volvo S60 T5 SE 2.3 Geartronic (Scrapped)
2007 Volvo S60 T5 SE 2.4 Geartronic (Sold)
2008 Volvo V70 D5 SE Sport Geartronic (Current)
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