S40 (New) Engine 2.0D : poor acceleration

[msh]

Hi

I drove the wife S40 2.0 d 2005 110000mile at the weekend for the first time in a while. Ok around town but on the dual carriage way very poor acceleration and would not go above about 80mph. Would go to the redline. After a little looking around the turbo boost valve on the end of the engine by the air box the bracket had broken and the pipe had been trapped. Welded the bracket and put it all back together. I now have good acceleration in low gear but seems a bit lacking in high gears, top speed is much improved. Does the ecu need time to reteach itself after being driven with the turbo not working.
Thanks
Mark

[msh]

Hi

an update of the above

I drove the car today totally useable but lack the good acceleration in the top gears as it had when we got the car.

Any suggestions

Thanks
Mark

[Guru]

At 110,000 miles I'd expect that the turbo actuator rod that governs the geometry and movement of the turbine vanes would be sticking and not shifting fully in order to maximize the use of the exhaust gases by the turbine.
In the red circle is the actuator and the arrow points to the actuator rod.


Another possibility> The MAP sensor could be acting up.

[msh]

Hi

Thanks for the reply two questions

1 can the turbo rod be lubricated etc

2 can you test the map sensor

Thanks
Mark

[Guru]

Hi,

It's not a lubricating/cleaning job, the inner diaphragm of the actuator becomes corroded and that's what causes the rod to stick, the actuator as a whole can be purchased for cheap in comparison to the price of a turbo, for example This one should fit as the turbo in the 2.0D engine is a Garrett GT1749V unit

But then again, this is only a wild guess, before buying a new actuator, you should have a turbo specialist examine your turbo first to confirm that the actuator is the cause of the symptoms your experiencing. Poor acceleration can also be caused by a vacuum leak from a split in, or a loose connection of, the larger hoses connecting turbo to intercooler to manifold... ect.

[mullymonster]

Hi

This is my first post but i have been following a lot of post on here about V50 2.0D 2008, Euro 4 and no DPF was put on this car from standard. I have put a St225 IC on the front and its brand new.

I have been unfortunate to have been stung by the love of V50s and the engine that goes with them.

I have had an on going issue over 4 weeks. I stated by buying the car with 97k on the clock and it was in good running order.

Got it Eco mapped by Angle tuning and was initally impressed with the torque but the smoke was a tad sever. I have a heavily modified 300tdi defender 90 and that smokes but nothing like this volvo.

Boost issues started in the form of acceleration restriction above 2500rpm. this was after and intense clean of the engines inlet manifold (which was 1/3 caked in sludge). the issue seemed to be the TCV. Changed it with no joy. Got it checked by Volvo (reluctantly back in ireland) and they said fuel pump volume control solenoid. Changed it and nothing. Got the high pressure fuel pump service and it was perfect but he changed the pressure regulator on the underside of the pump and it ran like a dream.

200miles later the dreader Engine system service required flashed up and it ran very sporadically which was hopping like crazy as if it was cutting the fuel again like the pump problem but worse.

Was in route to Belfast via Dublin heading back to the uk so i decided and so too did 3 other professional that my remap was causing the problem. Got it reset to standard software at a cost of 180 euro and low and behold no change. The volvo technician told me on the side to block my egr as it may be choaking my engine as it threw up a fault.

Did a diy plate from a coke can and it ran like a dream for 200 miles and then i noticed the boost was gone. turned the car off and on again and it returned. it has don this for a week now and generally boost well until about 20 mins/miles later and then it basically stays like and standard diesel. This coincides with the engine service required coming on but not always the case. Unplugged the EGR and it did the same thing.

I am currently at my wits end with this car and i have a Aberdeen to Cornwall drive on Thursday so this issue would need to be sorted asap.

Please excuse the bulk of text but i don't want to waste time telling people what ive already tried.

I'm going to be changing the MAP & MAF sensors tomorrow as I have cleaned both of them but cannot vouch for there integrity.

Im going to get the egr excluded by Celtic tuning and a remap from them soon as i hate EGRs and everything that goes with them.

Please someone help me as this has cost me a fortune in bits and bobs which have fixed one issue and brought up another.

Thanks in advance (ps is Celtic tuning in Roach Cornwall good)

Colin

[Guru]

Hi,

EURO 4 engines cannot have their EGR valves blanked off and unplugged as it will cause a SEL to show up eventually like you're experiencing, so if you plan on keeping it that way then go ahead with the EGR software delete but until then remove the blank and replug it, it may not solve the issue completely, but the limb mode will become less frequent.

My diesel power box would cause the same performance issues, and the fuel volume regulator solenoid would generate an error code "P0002, P0089" .. solved for now only by unplugging the power box, so since you have reset the map to default but still getting limb mode, and both solenoids on the pump have been replaced then there's still one pressure regulator on the fuel rail, perhaps that's the faulty one?

Smart phone free app "Torque" through a bluetooth ELM 327 module is a scanning tool that transmits real time data you can watch on your phone during driving, it will show turbo boost, MAF, MAP, temp readings and a few more.. helpful to identify which sensor is acting up.
And for accurate OBD II engine diagnostics, the free app "Carista" works very well, comparing with the results of original Volvo diagnostics "VIDA" it was spot on when diagnosing engine faults and the fuel system!

[mullymonster]

Thanks for the reply

I have already had the fuel rail pressure sensor changed and no difference was made so i replaced it but still have the spare.

I am guessing the limp mode is no turbo then yes.

I have had a mechanic review live feed and it seemed to be running ok pressure wise but this was before the overhaul of the pump. I may invest in that software and OBD II port.

Why would the boost return and then a certain length of time later just dwindle. I will puncture a hole in the plate later to restrict the gas flow as at present the EGR periodically fully opens and smothers the engine and makes it very dangerous to drive.

[msh]

Hi
I got to the bottom of what was causing my problem. I had no error massages. I had a 2mm split in the pipe from the intercooler to the throttle body which must have been opening up but not all the time giving loss of power.
Hope this helps
Mark

[mullymonster]

Where was the split mark. I may have caused some damage when I was putting the inter cooler in.

Thanks