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S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
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Hello all v70 d5 misfireViews : 6135 Replies : 75Users Viewing This Thread : |
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Sep 26th, 2020, 15:09 | #71 | |
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I'm late to this thread and have skimmed through it, so apologies if this has already been covered.
Turbo underboost P029900 is a bit of a bugger as it could be many things. I had this fault with no discernible loss of power at all. Not sure exactly what variant yours is but on a twin turbo it can be many things - the obvious culprits are dirty fuel filter or the tmap sensor on the intercooler. The latter is a swine to get to (bumper off, remove radiator bracket/brace but once you' re in there, 1 screw)) but it is a relatively common failure. The other is the sensor on top of the engine on the induction side that goes in what most of us would still call a rocker cover: it can fail and/or get totally encrusted with gunk. Other things to check are the turbo control valve - start the car, let it run, turn it off and wait a few seconds and you should hear the car "burp" and see the actuator rod move. And of course, ensure there are no air leaks. You can read the whole saga here: https://www.volvoforums.org.uk/showthread.php?t=309996 Or, simply cut the to end for the parts numbers: Quote:
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D5, 205 Phase 3 V70...love the grunt. Previous: 2004 (2005 facelift) 2.4 170 Last edited by RM955I; Sep 26th, 2020 at 17:43. |
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Sep 26th, 2020, 20:44 | #72 |
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Hello guys,
Unfortunately tonight i found the cause of the problem, it looks as though number 5 rocker has detached and snapped, taking some cylinder head with it. So I will be probably selling the car on now to someone who has the time/ means to repair it. Thank you all for all your help |
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Sep 26th, 2020, 20:55 | #73 |
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What a mare!! Not exactly the solution you wanted. Your welcome with the replies even though it was not the expected outcome
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Sep 26th, 2020, 21:20 | #74 | |
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Did you not have excessive cam-train noise or noise in the airbox? For what it's worth, repair will likely be just as costly as buying another used car and putting right all the bits you find after your purchase. At least you know what the rest of the vehicle is like now. |
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Sep 28th, 2020, 16:58 | #75 | |
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All the best
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Sep 28th, 2020, 19:09 | #76 | |
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