Loss of boost

[bigfella044]

Has anyone had an issues with loss of boost. I have replaced all the vac lines, the boost control solenoid and the hot pipe and the problem persists. When it happens I turn the car off and restart and that solves the problem for a while, any ideas would be helpful, thanks in advance

 

[ericcs]

I take it, you have an early 126kw D40 then?

 

[bigfella044]

Yeah mate 2009 d40

 

[fuzzylogic]

mine does the same thing...wracked my brain, flexed my wallet...I just turn it off, and presto, it goes again. Mine has periods where it does it, and then long stretches when it doesn't. I think it's a brain glitch (ecu)
2008 D40 (thai) lots of mods

 

[Nomadic Navara]

I had that for a while. My mechanic suggested it was to do with the throttle control mechanism. Every time I experienced the problem it was the result of planting my foot to exit a corner or make a run at an upward slope.

The explanation of the problem goes this way. The throttle position sensor at the throttle pedal sends two signals to the engine control box. If the two signals do not appear the same on arrival at the control system, the system goes into limp-home mode. As Fuzzy said, turning the motor off seems to cure the problem each time.

 

[MANNING]

Have you tried cleaning the battery earthing points.

 

[[email protected]]

i bought a 4x4 2007 ssangnond with 40000 klms on clock .would go into limp mode all the time when i drove it home. stop start would cure it for 2 minuites if i was going up hill.. on flat it lasted longer, i could hear some noise comming out of the throttle body so i removed the air intake hose at the throtle body, , and could see the flap working over time , i disconnected the loom to it. fixed the problem, for some reason i lost use of cruise control..did about 500 ks untill new part arrived. I pulled the old unit apart and saw that the plastic segment gear had lost 2 teeth. this obviosly caused the flap to move about a third of its movement it would go crazy when you would start the engine.
throtlle body would last about 35000klms , i replaced 2 units over 90th kls each time i pulled the old units apart broken seg gear. the gears looked very brittle

 

[[email protected]]

another problem on ssagnong. with boost control solenoid was that it had a sponge filter that would clog up . neede a fine pick to flip the cap off to be able to clean it

 

[bigfella044]

I had that for a while. My mechanic suggested it was to do with the throttle control mechanism. Every time I experienced the problem it was the result of planting my foot to exit a corner or make a run at an upward slope.

The explanation of the problem goes this way. The throttle position sensor at the throttle pedal sends two signals to the engine control box. If the two signals do not appear the same on arrival at the control system, the system goes into limp-home mode. As Fuzzy said, turning the motor off seems to cure the problem each time.
[/QUOT

 

[bigfella044]

Mine is always at start up, go to take off and got no power. Hiw did you fix the issue did you replace the throttle control sensor or the whole thing

 

[bigfella044]

Have you tried cleaning the battery earthing points.

 

[bigfella044]

Yeah mate there all clean

 

[bigfella044]

I had that for a while. My mechanic suggested it was to do with the throttle control mechanism. Every time I experienced the problem it was the result of planting my foot to exit a corner or make a run at an upward slope.

The explanation of the problem goes this way. The throttle position sensor at the throttle pedal sends two signals to the engine control box. If the two signals do not appear the same on arrival at the control system, the system goes into limp-home mode. As Fuzzy said, turning the motor off seems to cure the problem each time.

 

[bigfella044]

Did you get any fault codes when it happened, I am Not getting any engine warning at all

 

[Nomadic Navara]

Mine is always at startup, go to take off and got no power. How did you fix the issue did you replace the throttle control sensor or the whole thing

I did nothing. For some reason the problem went away by itself.

 

[ericcs]

i had a loss of boost last year, ended up being the turbocharger boost pressure sensor on the drivers side of the intercooler, kept popping off!

 

[fuzzylogic]

I had that for a while. My mechanic suggested it was to do with the throttle control mechanism. Every time I experienced the problem it was the result of planting my foot to exit a corner or make a run at an upward slope.

The explanation of the problem goes this way. The throttle position sensor at the throttle pedal sends two signals to the engine control box. If the two signals do not appear the same on arrival at the control system, the system goes into limp-home mode. As Fuzzy said, turning the motor off seems to cure the problem each time.

This makes a lot of sense to me, mine glitches when I'm going to work, with a fully loaded tool trailer, and I'm nursing her, just floating on the throttle trying to be nice to the old girl. If I"m my usual self, and sticking the boot in, she just about never does it.. (I changed MAP sensor, vacuum lines, boost solenoid etc trying to fix it).
Now here's the curious thing, even when it's doing it, it sounds to me like the turbo is still spooling up, induction noise sounding normal.... so where does the boost go? This makes no sense I know...

 

[Nomadic Navara]

Now here's the curious thing, even when it's doing it, it sounds to me like the turbo is still spooling up, induction noise sounding normal.... so where does the boost go? This makes no sense I know...

The limp home mode does not control the turbo, it controls the amount of fuel fed to the cylinders.

 

[chookc]

So I have a similar prob. Only happens on cold start mornings. Reverse out driveway and go to take off up hill. plant foot and car goes nowhere. revs sit at 800 to 1000. The car slowly moves off and revs hunt towards 2000. hits about 2200 revs and turbo kicks in and off you fly straights to 4500 revs
the car can take a whole turn signal 30 plus seconds to right turn an intersection before it reaches enough revs for boost only does it 2 to 3 times and then is good once the car has reached operating temp. Warming the car up sometimes solves the issue but not always. where to start

Ps my ute is fully loaded with work gear. longrange tank bullbar and roof racks. weight is at the upper levels

 

[chookc]

Sorry it is a 2011 550 nav.