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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 : 6082 Replies : 75Users Viewing This Thread : |
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Sep 26th, 2020, 15:09 | #16 | |
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Last Online: Jun 26th, 2022 23:42
Join Date: Mar 2012
Location: Midlands
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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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