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Several faults

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Old Jul 7th, 2020, 12:40   #1
canis
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Default Several faults

So, today I chugged my way to a garage I know, who pointed me at another garage so I chugged there, smoke billowing out the back end. They diagnosed several faults:

1) Fuel Pressure
2) Air-flow sensor
3) Camshaft position sensor.

Can these be bought only from volvo, or from anywhere? It's a diesel. I have a spare fuel pump, but it's petrol - are they different? Anyone know anything?
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Old Jul 7th, 2020, 13:39   #2
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Originally Posted by canis View Post
So, today I chugged my way to a garage I know, who pointed me at another garage so I chugged there, smoke billowing out the back end. They diagnosed several faults:

1) Fuel Pressure
2) Air-flow sensor
3) Camshaft position sensor.

Can these be bought only from volvo, or from anywhere? It's a diesel. I have a spare fuel pump, but it's petrol - are they different? Anyone know anything?
Air flow sensors for the diesel are fairly common, I believe they are very expensive new from Volvo but there's plenty around in scrappers. Same ones as fitted to Renault Lagunas, Meganes and possibly the Renault Trafic / Vauxhall Vivaro / Nissan Primastar so there's some around at a good price.

Don't be tempted by a new aftermarket one as I found out the hard way they are crap. OE ones are Siemens branded.
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Old Jul 8th, 2020, 11:08   #3
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A few too many sensors, to all fail at once. Have you checked the sensors fuse in the engine bay fuse box, to see if it is ok?
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Old Jul 8th, 2020, 11:47   #4
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It wasn't quite all at once. I've been experiencing a flat spot during accelleration at precisely 2200 RPM, which has been progressively worsening. I'd been considering fuel pressure as a possibility, or MAF sensor. A couple of times it's cut out during hard accelleration on slip roads ever since I took possession. But I shall check the fuses now.
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Old Jul 8th, 2020, 13:47   #5
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Originally Posted by canis View Post
It wasn't quite all at once. I've been experiencing a flat spot during accelleration at precisely 2200 RPM, which has been progressively worsening. I'd been considering fuel pressure as a possibility, or MAF sensor. A couple of times it's cut out during hard accelleration on slip roads ever since I took possession. But I shall check the fuses now.
That is pretty much precisely the same fault I had when the MAF was at fault, and unplugging makes no difference
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Various other French and Italian boxes
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