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V70 very inter power loss cured !!

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Old Mar 28th, 2009, 23:05   #1
hobbyhorse
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Default V70 very inter power loss cured !!

This fault has been bugging me for a couple of years, it's been very intermittant & gives no fault codes : a sudden power loss in mostly second & third gear with no excess smoke from the exhaust. I think most of us are well aware of the weird & wonderful intermittant power losses caused by the fuel filter & the head scratching fault codes that arise from the fuel starvation; this next fault involves air starvation, hopefully this will help some people out:

The trusty D5



Cover removed



The inlet pipe to the turbo is not easy to reach but I'm determined to leave the top engine mount & crossbar in place



The turbo creates quite a high localised vacuum in the inlet pipework, the rubber inlet pipe has denatured & gone very soft. Under heavy boost the vacuum is sufficient to squash the pipe & stop the airflow. My paws are quite big, it's a bit of a struggle. I end up laying on the engine but that's cool 'cos I love this car



Luckily the jubilee clamps are moveable, nearly there now



The vacuum has crushed the pipe so hard it's split.



Notice the pipe is so soft I can easily squash it into a ball



The new pipe is very hard & I struggled to get the crankcase ventilation spigot in for 15 minutes before I cheated & gave the plastic body a chamfer with the Dremmel





Job done. It's been a bit of a tussle but I'm well pleased to have finally cured this fault, the car's never driven better. Also I've just got the all clear from a year long cancer scare. It's been a good day

pipe part No 30636854

Last edited by hobbyhorse; Mar 28th, 2009 at 23:12.
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Old Mar 29th, 2009, 10:49   #2
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Well done and good news on both counts!
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Old Mar 29th, 2009, 14:43   #3
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Originally Posted by Chris_Rogers View Post
Well done and good news on both counts!
Indeed!
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Old Mar 29th, 2009, 14:46   #4
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How many miles on the car HH?
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Old Mar 29th, 2009, 15:58   #5
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How many miles on the car HH?
She's just turned 74k, this fault first showed at about 50k, she's a 53 reg

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Old Mar 29th, 2009, 20:36   #6
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Mines also a 53 plate and has 66k so I think I`ll check mine as its easy to get to Thanks for taking the time and posting the pics for us
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Old May 17th, 2009, 16:41   #7
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Thanks HH,Only seen this post today,Its posts like this and folk like you who make VOC forumn worthwhile




Ps : out of curiousity how much was the part?
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Old May 17th, 2009, 17:58   #8
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The fact that the vacuum collapsed the weakened from oil pipe also shows that the engine would benefit from a larger air filter and pipework to the turbo ... In an ideal world there would be no vacuum at the turbo charger inlet ..
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Old May 17th, 2009, 18:41   #9
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Nice one! I'll be checking mine ASAP. Good right up and well done on both counts.
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Old May 17th, 2009, 19:46   #10
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Cant believe I missed your original post at the end of March as I thought I was diligent in reading diesel posts , just makes me think I have probably missed some other useful posts as well , great photos and well done beating the cancer . I had the turbo off my D5 looking for a reason for intermittant power loss over past 30k miles but no repeat at all since end of Jan but nothing done to repair except unplugging and reconnecting various sensors so I am inclined to think the original cause is still there , I did check the turbo pipes but I recall the inlet pipe being soft as you describe and thought that was normal ! I will get this changed asap and have a closer look for splits .
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