Check, fuel filter, air filter, MAF, boost solenoid, intercooler clips and hoses.
Hi thanks for posting this. Here I am in year 2020 with similar problems. My story is I blew my turbo few weeks ago. Bought a new one and installed, but my D40 still smokes and has no power.Good day guys,
I am new to this forum so humblest apologies if I started a new post that has already been dealt with, but here it is.
My 2006 D40 aventura has lost a lot of power and is producing lots of black smoke. I took it to my mechanic and this is what's been done so far. Diesel filter and air filter change, EGR blank, MAF sensor cleaned and ecu scanned but has no codes.
I don't hear the familiar whistle from the turbo and I don't feel the kick I normally get when it cuts in. Hills I usually climb in 4th gear I am now doing in 2nd. On stand still when the engine is revved, I can see the hose that leads to the intercooler on the side with air filter box swelling so I can see some boost is being produced on stand still. The engine and turbo has no strange noises.
When the above filter changes etc was done, the truck pulled good with no black smoke on heavy acceleration. Thought the problem was solved but it returned a few minutes later, disappeared for about 5 mins of ordinary driving and then returned. My D40 is the first of only two on the island so the mechanic is not used to navara d40 issues. I have the truck for a year now. Any help will be greatly appreciated.
What made you Believe the turbo was blown ? They are usually the last port of call with black smoke and loss of power .As above ,if not blown intercooler hoses or intercooler holed are more likely issues to cause it.Hi thanks for posting this. Here I am in year 2020 with similar problems. My story is I blew my turbo few weeks ago. Bought a new one and installed, but my D40 still smokes and has no power.
Any help will be much appreciated.
Welcome to the forum.I have similar issues with my D40 YD25DDTi. Need 2nd gear to climb hills and top speed around 60mph. Fuel consumption around 23mpg Vs 35mpg when all ok.
I've changed the turbo control solenoid, changed the MAF sensor, checked the MAP (boost) sensor, changed the fuel and air filters. Torque app shows less than 5psi boost, intercooler pipe (when squeezed) has only a slight increase in pressure when engine revved. Turbo control solenoid clicks away as expected, vac lines checked and correctly connected, turbo vacuum actuator bobs uip and down as expected at idle.
Finally, I took it to a local and trusted mechanic who quickly diagnosed turbo. I changed the turbo, the removed turbo showed no obvious signs of failure, although I didn't strip it. Identical problem still exists with new turbo.
I'm now wondering if a blocked catalyst could be restricting the flow of exhaust and therefore the speed of the exhaust gas past the turbine. Is that a likely problem, has anyone heard of blocked exhaust/Cat and is there any way to check or confirm? Having just replaced the turbo, I don't relish trying to extricate the Cat unless it's a likely culprit.
I've been trying to sort this problem for aboul 9 months. Any help, advice or experiences much appreciated.
Thanks Landmannnn, I did try that some time ago. Made no difference. I also tried connecting a hand vac pump directly to the actuator vac inlet and manually activated the actuator. Still no difference.Welcome to the forum.
Bypass the BCS by putting the VAC hose directly on the actuator. If it makes no difference then the boost control is ok.
So, if boost control is OK, what could be preventing boost? I'm tending to suspect exhaust flow but don't want to head down another rabbit hole without justification. Is there any way the exhaust system can easily be checked for restriction? Or are there any other areas worth examining?Thanks Landmannnn, I did try that some time ago. Made no difference. I also tried connecting a hand vac pump directly to the actuator vac inlet and manually activated the actuator. Still no difference.