Long cranking time

richieski · Aug 14th, 2019, 18:48

Hi all, V70 135k D5.
More so when cold or left for a long time.It seems to take 5-6 cranks to fire up. Some cars start on 1.
I have checked a few things.
Leak back OK
New battery
No codes on Vida (exp alarm and AQS)
Anything else to check?

MarvinMitt · Aug 14th, 2019, 19:13

Monitor the fuel rail pressure to see if that's the problem.
If the pressure drops too much while standby then it needs more cranking to get to operating pressure.

richieski · Aug 14th, 2019, 19:21

Quote:

Originally Posted by MarvinMitt

Monitor the fuel rail pressure to see if that's the problem.
If the pressure drops too much while standby then it needs more cranking to get to operating pressure.

Is this possible with Vida or should be done by connecting a guage to the rail

reggit · Aug 14th, 2019, 20:53

Check the engine earth strap just below starter motor. These fail a couple of cm into the sheath at the starter motor end. Mine was always lazy to start until I replaced it with a heavy duty strap.

richieski · Aug 14th, 2019, 21:42

Thanks for the advice, will check strap in the morning.
Also hook it up on vida and get a graph of rail pressure and cranking speed.
Believe i need around 250 rpm cranking speed.
Anyone know the rail pressures? assuming my rail sensor is in working order.
Was going to check this too, measure the voltages. 0.5v at ign, 1.5v at cranking then 1.2v running. Is this correct?

AndyV7o · Aug 14th, 2019, 21:53

Most of them do take a few turns to fire.
Mine is worse when hot, cold it fires ok.

Aug 14th, 2019, 18:48	#1
richieski Member Last Online: Dec 27th, 2023 23:38 Join Date: Jul 2017 Location: Swindon	Long cranking time Hi all, V70 135k D5. More so when cold or left for a long time.It seems to take 5-6 cranks to fire up. Some cars start on 1. I have checked a few things. Leak back OK New battery No codes on Vida (exp alarm and AQS) Anything else to check?

Aug 14th, 2019, 19:13	#2
MarvinMitt Senior Member Last Online: Nov 1st, 2021 21:18 Join Date: Sep 2016 Location: Tartu	Monitor the fuel rail pressure to see if that's the problem. If the pressure drops too much while standby then it needs more cranking to get to operating pressure. __________________ 2002 V70 D5

Aug 14th, 2019, 20:53	#4
reggit Premier Member Last Online: Yesterday 19:56 Join Date: Feb 2012 Location: Preston	Check the engine earth strap just below starter motor. These fail a couple of cm into the sheath at the starter motor end. Mine was always lazy to start until I replaced it with a heavy duty strap. __________________ 2009 Volvo V70 D5 (Polestar 225bhp) r-design 180,000 miles

Aug 14th, 2019, 21:42	#5
richieski Member Last Online: Dec 27th, 2023 23:38 Join Date: Jul 2017 Location: Swindon	Thanks for the advice, will check strap in the morning. Also hook it up on vida and get a graph of rail pressure and cranking speed. Believe i need around 250 rpm cranking speed. Anyone know the rail pressures? assuming my rail sensor is in working order. Was going to check this too, measure the voltages. 0.5v at ign, 1.5v at cranking then 1.2v running. Is this correct?

Aug 14th, 2019, 21:53	#6
AndyV7o Premier Member Last Online: Jun 21st, 2021 20:47 Join Date: Jun 2018 Location: Creswell	Most of them do take a few turns to fire. Mine is worse when hot, cold it fires ok.

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