Volvo D4 225 2007

[mike james]

Last year, 2011, the engine when the boat was first put back into the water would not go past 2000rpm. It stopped at exactly that point which was just before the turbo came in and the boat went on the plane. After numerous flicking backwards and forwards with the control over about three hours it suddenly fixed itself. This went on for a few weeks and as always when the Volvo service agents were on board there was no problem! Over the summer months it was almost permanently fixed just the odd glitch.
This year, 2012, the same thing happened however it failed much more than it worked and returning to neutral and starting again was the norm.
Service agents checked again and "no faults" shown on the computer which suggested it was not an engine fault. They suggested I try putting the leg up and perhaps using trim tabs which I felt was unlikely to work as for the first three years of ownership I had not had any problems at all.
They then decided to replace a sensor on the Turbo as a last resort and lo and behold when I went out on Sunday all was well. Hopefully this problem is now solved!

 

[volvopaul]

Boost sensor, common problem as your d4 does not have a supercharger to get it up on the plane.

 

[aquatom]

Agree with Paul. I changed two last week. It's the first thing to check on d4 and d6. The sensors I changes failed on the boost temperature part giving a much higher reading than it was. Resulting in less fuel being injected and less boost produced! Although the sensors fail they rarely go out of operational range so the evc system dosnt see it as a fault.

 

[matm]

I think I've also noticed a "slowness" to get on the plane i.e. turbos kick-in - could this be the boost sensor too? Could be imagination but definitely feel I've been waiting for a little bit vs a year or so ago.

Same engines..

 

[AllanG]

Boost sensor, common problem as your d4 does not have a supercharger to get it up on the plane.

Hi Paul,

Is this the same item as the charge air pressure sensor (part No. 21385453)?

If not, where is this sensor located on a D4, and do you know the part number?

Many thanks,

Allan

 

[volvopaul]

Hi Paul,

Is this the same item as the charge air pressure sensor (part No. 21385453)?

If not, where is this sensor located on a D4, and do you know the part number?

Many thanks,

Allan

Sorry not off the top of my head, just ring Rk marine the boys there in parts dept know there stuff and will point you in the right direction.
As with all modern gizmo engines as Tom said you can't always believe the vodia due to parameters set in the ecu, faulty sensors just sometimes need cleaning on the probe with thinners or petrol, when they go off working 100% the engine thinks it's pulling the load relating to the sensor readings therefore it won't accelerate any more.