Volvo v70 d5 2008 185bhp auto - Volvo v70 d5 poor running

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Mon 18 Nov 2013 20:39
Volvo v70 d5 2008 185bhp auto - Volvo v70 d5 poor running - pauljf.07
I have a slight misfire at around 35mph / 1600rpm on a light but constant throttle, also when in park, and revvec to same rpm a roughness/ imbalance can be felt. Economy seems poor too, 34mpg driving very carefully at 75mph..
Gearbox also seems sometimes uncertain which gear to be in and sometimes the revs flare a bit on shifting. This morning it seemed to only start on not all cylinders for a second or so too. No warning lights show. Dealer has done a software update re the injectors under warranty and changed a driveshaft but problems persist. Its driving me mad. Does anyone have any suggestions?, dealer seems to have lost interest and i've only had car since september!.
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Tue 19 Nov 2013 10:52
Volvo v70 d5 2008 185bhp auto - Volvo v70 d5 poor running - craig-pd130

I'd start by looking under the engine cover for any split / chafing hoses, especially the thin rubber vacuum hoses which control the turbo boost, EGR valve and the engine mounts (at least, I *think* they were still vac-controlled on your car, I'm not 100% certain).

Make sure all the hoses you can see / get at are pushed snugly home on their spigots, and are not twisted, kinked, trapped etc.

Then check the big pipes that carry boost from the turbo to the intercooler, and intercooler to inlet -- are any of them wet with oily goop (implying a split)? Check the hose clips that secure them are tight (7mm ring spanner or screwdriver).

If these all check out fine with no obvious faults, then it's worth looking at the electrical connections on the MAF sensor, fuel rail, boost pressure sensor and vac solenoids. Just unplugging and reconnecting these 4 or 5 times can 'wipe' the connectors clean.

In my experience, a dealer is unlikely to check any of these items, but many drivability problems can stem from these.

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Tue 19 Nov 2013 18:55
Volvo v70 d5 2008 185bhp auto - Volvo v70 d5 poor running - pauljf.07
That's great, thankyou for the ideas, will have a look this weekend. I guess the dealer is only interested if a fault code shows up!.
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Tue 19 Nov 2013 19:30
Volvo v70 d5 2008 185bhp auto - Volvo v70 d5 poor running - craig-pd130

Have a look here, this may help in finding what's where in the engine bay: some good underbonnet pics. Admittedly on an S80, but it's the same layout.

http://forums.t5d5.org/topic/12748-volvo-d5-service-faults-general-errors/

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