NowForThe5th wrote:See my avatar.
As you'd be aware, the vanes on the turbo change angle in the situations you describe. It sounds like that isn't happening. There is an actuator which is controlled by vacuum from a solenoid valve which is actuated by the engine ECU. My first guess would be that one or both of these are not functioning correctly, either jammed or not receiving vacuum. There are service specifications and drawings in the online Technical Manual.
DibbyDibbyDJ wrote:18 psi boost on an MN? Seems a bit low. From memory more like 25psi ish, which is about 160kpa.
Remember, valves can be tight too, and dont make noise. I would be checking clearances soon.
Doing an SQL can fix some dirty injectors. Like the fuel leak test i mention below, it can dislodge some dirt from the nozzles.
I would also be testing it with throttle controller and snorkel disconnected.
And what MAF sensor does it have? I have seen non genuine ones cause smoking issues.
..... And some other thoughts
Sometimes you get a poor connection on the MAF sensor. Unplug it, and look at the pins on the sensor. They are all sitting like _ _ _ _ _ With some long nosed pliers twist them a little so they are pointing up like
/ / / / / but no where near as much. This will confirm a good connection.
How did you use injector cleaner? In the tank? Best way is to block off fuel return pipe and run engine directly from injector cleaner. It make take 20 or so minutes to use it all but it does work well.
Another thing to try , if you can get access to Bi directional scan tool is to do a fuel leak test. This ramps up the fuel pressure to maximum, to check for a leak after working on the pipes. It also can clean dirty injectors and SCV.
If none of these work i would be using a oscilloscope to check injector current draw pattern.
RHKTriton wrote:The actuator arm may move, however the vane mechanism may have play to the linkage.
Also possible, is that the vanes are full of goop.
srb wrote:In the early days of the MN we would all joke and say it was "the calm before the storm"
srb wrote:Lot's of turbo lag and black smoke on take off? Does it go a bit like this... nothing, nothing, nothing, then suddenly, "whooshka" off it goes and nearly puts you off the road!!
In the early days of the MN we would all joke and say it was "the calm before the storm"
So yeah sounds like a perfectly normal. Sorry to say but you either live with it or go down the expensive path of performance modifications.
Sent from my SM-G970F using Tapatalk
Longranger1 wrote:Cleaned the mass airflow sensor lately?
Users browsing this forum: No registered users and 22 guests