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Hello all v70 d5 misfire

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Old Sep 26th, 2020, 16:09   #71
RM955I
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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:
The original part was 31303974.

This was replaced by 31355462.

The Bosch part is 0 261 230 294 which is hard to find and some say it is interchangeable with 0 261 230 293, others say not.

Eventually I found a Febi Bilstein part 103494 which says it is compatible with 31303974 and 31355462 - it even says it on the box.

I opened the box....it is a Bosch part 0261 230 293
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Old Sep 26th, 2020, 21:44   #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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Old Sep 26th, 2020, 21:55   #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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Old Sep 26th, 2020, 22:20   #74
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Originally Posted by saltyjim View Post
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
Bad news indeed but thank you for posting the result. It will help somebody in the future.

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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Old Sep 28th, 2020, 17:58   #75
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Originally Posted by saltyjim View Post
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
Yikes! Sorry to hear that, Jim but at least you've found the cause now even it it's a whopper to fix

All the best
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Old Sep 28th, 2020, 20:09   #76
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Originally Posted by 37 RUBY View Post
Bad news indeed but thank you for posting the result. It will help somebody in the future.

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.
No excessive or strange noises really, I guess once the rocker has slipped off and is out of the way and the valve is shut then there is no more crashing about it can really do. Cant believe how well it goes considering that, I guess in effect its just running on 4 and dragging that piston about
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