Power loss on a 2009 2.5 mn triton

[boosted22]

Howdy got little problem with my mn 2.5 td just after some suggestions on what it could be, il try describe best i can, it goes prefect from off the bottom till around 3000 revs then hits a wall like you have taken your foot off the throttle but its flat, just like its hit a boost cut it will surge a little trying to power on but wont but anything under this its perfect plenty of power goes very good but soon as revs get up it dies, not hugley noticeable in first gear but is in the rest car is basically stock motor wise not very noticable around town as i dont get revs up often that high but terrible on the highway trying to over take etc, cheers

[Doong]

Replace the fuel filter.

[boosted22]

Thanks i have one sitting there il give that a shot:)

[Mntritonman]

sounds like ya egr could be getting blocked. from what ive herd these are symptons.

[boosted22]

Ok thanks i do run a blanking plate in the egr would this matter

[RHKTriton]

Fuel and air makes the wheels go round.

Fuel filter, SCV, possible leak in air plumbing after turbo, SCV, swirl flaps stuck closed
and possibly clogged strainer in the fuel pump.

How many kms on your unit?

[ag9111]

Could also be the fuel rail limiter bleeding off at too low a pressure.
I fitted an upgraded limiter from SPV industries and all fixed.

[kouta666]

Do you get a Check Engine Light come on? I had a dodgy MAP sensor that would kill my boost

[boosted22]

Thanks guys no engine check light comes on at all has done 140,000 ks just installed all new forefront pipes and doubled checked all them seem fine doing the filter tomorrow see if any change there

[boosted22]

Whats the fuel rail limiter wheres thats located too can it be cleaned or just have to replace etc cheers

[coughy]

cant clean needs to be replaced
def the rail limiter bleeding off
mine was 100% same put new one in all great now
i have a remap done so this makes it worse when failing
did it on a chip as well
this is the animal need to check your vin tho
http://www.ebay.com.au/itm/FUEL-RAIL-PR ... SwBahVOdN9

[TritonMatt1976]

I finally found this post, it best describes my issue and wondering if anyone can provide some more info.

I have a 2014 GLX-R Auto MN which has been ECU tuned, runs very well unladen and even when the car is loaded. I have also had the EGR turned off in the tune and run a blanking plate (since new). has been serviced with new filters only 4500kms ago.

Over the weekend I did some towing (1.4t) nothing serious, however once I climbed into the blue mountains in Sydney's west it appeared that I lost significant power as altitude increased. Even on flat runs power was flat and I noticed a lot of black smoke under load- rarely does it produce black smoke at all.

No CEL or signs of intercooler leakage, at one stage the power dropped away so bad that any throttle movement did nothing- just dead response....

I have heard of SCV's being a possible issue and now this rail limiter?

any ideas please?

[NowForThe5th]

Doesn't sound like the rail limiter to me. When that goes it's like hitting a wall.

Did the power seem to come back once you returned to lower altitudes? If so, a MAF sensor clean may be in order.

[tritonmatt76]

Power returned once we got to lower altitude, I'll give the MAF sensor a clean and go from there.

When it lost power it was quite sudden and the engine had no response

[tritonmatt76]

5th- So I cleaned the MAF sensor today. Need to do some towing and see if it was the cause?

I just cant see why a dirty sensor wouldnt cause constant issues as opposed to only when under load?

[NowForThe5th]

Depends on how dirty it is. A little buildup may be just enough to misread the air density, which is why I suggested it as an elimination step, rather than the root cause.

[Stuart H]

Depends on how dirty it is. A little buildup may be just enough to misread the air density, which is why I suggested it as an elimination step, rather than the root cause.

Wondering how you went with fixing this loss of power problem with increasing altitude.Sounds like my vehicle has very similar problem. Has happened three times, exactly the same symptoms. Climbing at altitude, significant loss of power, CEL comes on. Engine develops no power at all below 2800 rpm.... and then it seems to develop moderate power. Throws a P0106 fault code. Dealer cleaned the mass airflow sensor. Same fault three days later climbing at altitude again. Freeze frame of stored fault pointed to MAP sensor out of range.... it was showing 100 kpa.....which sounds plausible as the engine was not producing any boost.... it should have been double this amount.

[RHKTriton]

Check that the tube from MAP to Manifold isn't blocked.

If you've got the RV meter, check that its pressure reading is changing with altitude. I'm wondering if the barometric sensor is also used by ECU.

[dan_4818]

Hey guys, thought id ask here before starting a new post. Ive got a similar issue with me 2010 mn 2.5L. Towed the boat today about 150kms and all was sweet. On the way home noticed significant power loss mostly between 2000-3000rpm. Boost seems very low around this rpm. Its very laboured like theres a blockage somewhere, can eve here a disctinct noise change with the engine. Tried with the boat disconnected and the same thing. Air filter is clean, maff sensor clean, I have the hi limit fuel rail fitted for about 6 years now and no issue, EGR is also blocked with Tonys Mod and has been for quite some time. Only other thing I can think of is the fuel filter which I will be replacing tomorrow to rule it out. Are there any other things I should consider checking.

Cheers Danel

[MilkmanDan]

Hey Daniel. Sounds like same symptoms when the SCV went on mine, was just as yo say feels like being starved. They are an easy change over accessed through the passenger side wheel well. Worth a try they aren’t expensive at all

[RHKTriton]

Don't forget that the MN has a VGT turbo. The vanes and actuating mech can bind if soot build up has occured.

If the vanes can't move to the correct angle, the turbine won't generate the revs to get the proper boost.

With the engine cool, operate the actuator by hand and see that it moves smoothly through the whole range.

[dan_4818]

Changed the scv today. Still the same issue. The actuator seems to move through all ranges. It feels like it’s not getting airflow or boost. Up to 3k revs it’s lucky to reach 8psi boost. Over 3k and it gets a bit better up to about 15 psi. I’m leaning towards boost leak. I’ve had a look over the hoses and they all seem fine. Might buy some hose and replace it all and fittings just to be on the safe side.

*edit. Have also noticed higher egts like it’s getting fuel but can’t burn it off

[RHKTriton]

Have you chucked a vac guage on the vac lines to see if there's vac up to the VGT mech?

If you're not getting enough boost the mixture will be rich.

[dan_4818]

No I haven’t I didn’t realise there was a port there to do that. Is there a specialist tool for it. I’m a fridgy so I have a vac stat and gauges but not sure if it will work on the car

[Walrus1973]

Hey guys did anyone find a fix for this? Mine is still doing the same thing only when towing under heavy load, loss of power and next to no boost on the scan gauge and a lot of black smoke. once I ease back a little or we are no longer on an incline the problem seems to go away. had this problem for over a year but only seems to happen when we are towing.