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IdleMind2504 wrote:Hey Guys,
My navara 4x2 SE (local), is spitting out black smoke when I cross 120KM/H, it does not happen initially, I can run at over 120 for a couple minutes then the smoke starts and the van looses power and continues to smoke once I accelerate to around 3K RPM.
If I keep it under 120KM/H and 3K RPM the van works fine... I have done my service and all filters changed.
Ideas on what next to do? Van is no longer under warranty by Massy btw.
android79 wrote:IdleMind2504 I am 90 percent sure I know what your problem is! I work on these vehicles every day and the number one cause of Navara black smoking the way you mention is the intake ducting. On Navaras the intake duct between air filter box and the turbo is very soft, when the turbo starts to spool the low pressure causes the duct to collapse on it self thereby stifling the engine causing your black smoke.To verify have some one mash full throttle and observe the intake duct. This problem is made worst by waiting too long to change you air filter.even if your filter clean take it out and drive without it and see.
sound boy 64 wrote:You changed the hose?
android79 wrote:IdleMind2504 I am 90 percent sure I know what your problem is! I work on these vehicles every day and the number one cause of Navara black smoking the way you mention is the intake ducting. On Navaras the intake duct between air filter box and the turbo is very soft, when the turbo starts to spool the low pressure causes the duct to collapse on it self thereby stifling the engine causing your black smoke.To verify have some one mash full throttle and observe the intake duct. This problem is made worst by waiting too long to change you air filter.even if your filter clean take it out and drive without it and see.
lighthammer wrote:IdleMind2504 wrote:Hey Guys,
My navara 4x2 SE (local), is spitting out black smoke when I cross 120KM/H, it does not happen initially, I can run at over 120 for a couple minutes then the smoke starts and the van looses power and continues to smoke once I accelerate to around 3K RPM.
If I keep it under 120KM/H and 3K RPM the van works fine... I have done my service and all filters changed.
Ideas on what next to do? Van is no longer under warranty by Massy btw.
Start with the basic possibilities first, and eliminate them one by one...
Black smoke is usually caused by a poor air:fuel ratio.
- check air filter for dirty/clogged filter
- check hoses for leaks and sagging (as pointed out earlier)
- dirty injectors can also cause poor atomization of fuel in the cylinder, hence poor combustion and excess smoke..... clean the injectors with a good diesel treatment, and it would be good to use a regular maintenance fluid like the Amsoil Diesel Concentrate & Cetane boost (i usually buy both, mix both into one bottle half-half, and pour 2-ounces into the tank per fillup.... remember it's concentrated, unlike other treatments!). To use amsoil diesel concentrate to clean ur injectors and fuel system, pour 8 ounces of the concentrate or 1/2 a bottle (instead of the usual 2 oz) in a full tank of diesel, run till almost empty, and then repeat for next tank if necessary.
You can also use Liquid Moly which is an excellent product to clean out a dirty fuel system... dump a full bottle of the Diesel Additive in a tank and run it down to almost empty.. just as good as the amsoil.
Navara's are notorious for being sensitive to our local dirty low grade diesel, and are slightly de-tuned so to speak from original Japan/Thailand specs on their ECU's (as I heard from a reliable source).
Next time you change your oil, or anytime you feel like it, try an ECU reset of the engine to reset your ECU and restore original specs.
Two methods:
1. switch off the engine
2. disconnect the battery (both terminals)
3. pump the brakes a couple times and switch on the ignition while battery is disconnected, then switch back to off... this is to discharge any residual charge left in the electrical system
4. Reconnect the battery
5. Start up the engine, and take the van for a short drive.... well, long enough for you to be able to have to use all 5 (auto trans) or 6 (manual trans) gears.... but drive gently/easily so that the revs are kept minimal as possible to go through the range of gears
6. get back home or to the garage and park up, then switch off.
This will reset the ecu and get it to re-learn your driving style - it will learn a more gentle shifting and fuel-mapping curve so as to not over-pulse the injectors with fuel and give black smoke.
Hope that helps, that's what I usually do to my ol' datsun whenever she starts to fart out the black stuff.
timos976 wrote:Good day sir,
My dad says its not good to run to almost empty.........he say it can daman the engine... what you view??
SiR8081 wrote:doesnt matter now, turbo gone thru. this forum is no help
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