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Intermittent loss of power

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R

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protonsnow
Posts: 20
Joined: 27 March 2020
Year and Model: 2000 Volvo v70 mk2T5
Location: Lisbon

Re: Intermittent loss of power

Post by protonsnow »

Hi.
I am still experiencing the same issue. I have changed the TCV valve to the one suggested above, but it made no difference.

All suggestions welcome.

Pressure builds up to the point where the dipstick is pushed out and oil sprays all over the fan and alternator.

Thanks

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RickHaleParker
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Post by RickHaleParker »

protonsnow wrote: 12 Sep 2020, 11:43 Pressure builds up to the point where the dipstick is pushed out and oil sprays all over the fan and alternator.
Does it pass the glove test?
Did you change the Oil Trap when you did the PCV?
⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙⸙
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

protonsnow
Posts: 20
Joined: 27 March 2020
Year and Model: 2000 Volvo v70 mk2T5
Location: Lisbon

Post by protonsnow »

No, if pressure is building in the engine, it does not pass the glove test.
And yes, oil trap was changed as listed in my first post.

Poppafranku
Posts: 9
Joined: 8 March 2020
Year and Model: 2001 V70 T5
Location: Lisbon

Post by Poppafranku »

Did you check if the oil drain passage to the sump was clear when changing the PCV? Sounds like the most likely culprit

protonsnow
Posts: 20
Joined: 27 March 2020
Year and Model: 2000 Volvo v70 mk2T5
Location: Lisbon

Post by protonsnow »

Thanks for the answer. Yes I did. I unclogged it as much as possible (wasn't that bad). In fact, the old oil trap wasn't really that bad either, but since I was experiencing this issue I changed the whole thing.

The funny thing is that if I'm driving fast enough (rpms higher than 3000) this does not happen. Also, when the engine is cold, it runs fine. I can get in the car in the morning, and it drives normally. If I stop it and come back a little later (I mostly experience this when going to the supermarket, so let's say 30 minutes later) when I come back and start it again, with engine still warm(ish), I always experience loss of power. Then if I rev it to 2500 rpms and keep it there for about 5 or 6 seconds (while moving), it suddenly 'releases' and regains the power.

protonsnow
Posts: 20
Joined: 27 March 2020
Year and Model: 2000 Volvo v70 mk2T5
Location: Lisbon

Post by protonsnow »

Also (forgot to mention this):
Before the PCV change the engine would idle erratically. Now it doesn't, but I do feel a slight jerk/hesitation on acceleration (when there's no power loss). When the power loss issue occurs, the engine makes a lot more noise and progresses really slowly.

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RickHaleParker
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Post by RickHaleParker »

protonsnow wrote: 12 Sep 2020, 12:44 And yes, oil trap was changed as listed in my first post.
Nope you listed Breather tube, Oil and Oil filter but not Oil trap. That is why I ask.

How about the rest of the hoses in the PCV system, leaks, blockage ... ect. Ports from Oil trap to Crankcase can clog up.
Last edited by RickHaleParker on 13 Sep 2020, 10:50, edited 2 times in total.
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1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

protonsnow
Posts: 20
Joined: 27 March 2020
Year and Model: 2000 Volvo v70 mk2T5
Location: Lisbon

Post by protonsnow »

Please go back and look again. I clearly listed 'oil trap' in the list of parts I changed (my first post in this thread).
I also changed all the hoses. Not really sure what the 'banjo bolt' is.

protonsnow
Posts: 20
Joined: 27 March 2020
Year and Model: 2000 Volvo v70 mk2T5
Location: Lisbon

Post by protonsnow »

Ah, the bolts with holes in them. Well they came new with the pcv kit I bought.

protonsnow
Posts: 20
Joined: 27 March 2020
Year and Model: 2000 Volvo v70 mk2T5
Location: Lisbon

Post by protonsnow »

RickHaleParker wrote: 13 Sep 2020, 10:54 Never mind the Banjo bolt did not come out until 2002.
Did you clean out both ports from the Oil trap to the Crankcase?
It has a banjo bolt. (the one that connects the thicker pipe to the right side of the engine)

Am I correct in assuming the fact that the dipstick gets pushed out releases the pressure? If so, I don't really understand how it can be building up further, since the dipstick is always out now (I deliberately never push it back in).

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