SC35
Well-known member
Post #10
Volvo Penta D3 190 limp mode / fault gremlins. Please help!
- Thread starter GooseGas
- Start date
Post #10
ChromeDome
Well-known member
Vacuum: Traditional petrol engines took the vacuum from the intake manifold (engine sucking from carbs), but modern injection systems (esp. diesel) can't generate sufficient vacuum for the still increasing demand.
Hence separate pumps are fitted.
Hence separate pumps are fitted.
vas
Well-known member
No reason to register as an error on an electronic monitoring system, unless there was specifically a vacuum sensor in the system...I so hope you have found my issue too…., I will get to Marina in Friday morning and investigate.
Why would VP main agent not pick that up on his nvodia system though
Doral Prestancia - Spain
New member
Doral Prestancia - Spain
New member
I have a new part 3 fitted….
vas
Well-known member
I guess the builders have to draw a line on where they stop stuffing an engine with sensors.So even main Volvo Agent would not trqce this fault on the system
OTOH, it should be possible to decipher the behaviour and at least through a helpful warning by checking and comparing the throttle position to the turbo boost.
Yes, rpm vs boost is fine, but throttle position against rpm and against boost is not fine. Could be failing turbo but could be this vacuum pump which seems to be the issue in yours as well.
Now, how come both of them fail together, that's another story, but for sure it's going to be dead easy to check by unplugging the vaccum hose on the turbo side and check what it produces...
oh well, still it's better than ECU throwing misleading errors/warnings that get you searching (and start part replacing) on something irrelevant (happens a lot in modern cars!)
V.
GooseGas
Member
To an extent they did. VNT valve out of normal range and the Actuator fault are all a result of the vacuum pump issue, it’s just that the computer is pointing at the wrong source of the problem.So even main Volvo Agent would not trqce this fault on the system
The other thing that led us massively astray was it faulted across both. So two worn out turbos, one with a failed vacuum pump was resulting in both looking like the same thing…..but with new turbos, it still appeared as the same issue, just the vacuum pump on one was holding the whole system back.
Let me know how you go Doral. Definitely looks and sounds like a pressure loss from hoses / pump / manifold gasket knowing what we know now.
GooseGas
Member
Yeeeeep. As soon as I got the call today I thought of your post! Thankfully only 2 weeks ago and apart from a fuel system check we’ve not added to the parts list.
SC35
Well-known member
Sounds like you mostly have a new drivetrain, fitted one part at a time
Fingers crossed that it will just be engines and drives burbling away happily from now on.
Last edited:
Royelia
New member
Hello am having the same problem as well, where do you hook the vacuum gauge to check for pressure?
Royelia
New member
Where you able to solve your problem, please let me knowI have a new part 3 fitted….