Volvo v70 diesel

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Volvo v70 diesel

Postby mekaniker » Tue Oct 10, 2017 6:51 pm

Hello, need help/advice
2008 Volvo d5 idle fine, good power, start fine, no faultcodes, injector return looks ok, but dont run fine driving 50-55 km/t, have som missfire/shaking.
New oil and filters, also used /bg-245-diesel-premium-fuel-system-cleaner.
Ant idea?n
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Re: Volvo v70 diesel

Postby RYM6746 » Sun Oct 15, 2017 10:48 pm

What is the fuel pressure doing whilst the fault is occurring?
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Re: Volvo v70 diesel

Postby mekaniker » Wed Oct 25, 2017 6:28 pm

RYM6746 wrote:What is the fuel pressure doing whilst the fault is occurring?

Around 500 bar , 1550rpm
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Re: Volvo v70 diesel

Postby Technician » Wed Oct 25, 2017 9:15 pm

Any chance you have a scanner capable of recording live data?

Take it for a road test at the said speed and then play back the live data and see what circuits are affected ?
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Re: Volvo v70 diesel

Postby mekaniker » Wed Oct 25, 2017 9:28 pm

Technician wrote:Any chance you have a scanner capable of recording live data?

Take it for a road test at the said speed and then play back the live data and see what circuits are affected ?

Yes, i Will try to record some data....
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Re: Volvo v70 diesel

Postby volrem » Thu Oct 26, 2017 9:22 pm

Scope crank sensor and sync it to some injector current. And post here.
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Re: Volvo v70 diesel

Postby RYM6746 » Thu Oct 26, 2017 9:40 pm

If possible scope rail pressure over a long period of time with a high sample rate whilst the fault is occurring. I am guessing it will be fluctuating which will indicate a IMV issue. I have seen this fault before on volvos. See if it has 2 regulators on the pump. If it does fluctuate and does have 2 regulators it is usually the regulator under the pump which is difficult to see. I am pretty sure you can only buy that perticular regulator with the pump

I have before and after waveforms. If this is the fault I think it is. Post the waveforms on here so I can take a look
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Re: Volvo v70 diesel

Postby volrem » Fri Oct 27, 2017 9:16 pm

RYM6746 i bealieve you are taking about 2.0D engine. This is 2,4 and does have two regulators but volume regulator is on pump and pressure regulator at fuel rail.

This of course doesn't mean that there could not be something wrong with either of these.
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Re: Volvo v70 diesel

Postby RYM6746 » Sun Oct 29, 2017 11:19 pm

Ahhh yes you are correct that was the 2 litre.

Definitely worth a shot on scoping the fuel pressure whilst fault is occurring.
At the very least, you can at tick it off the list of possibilities
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