White smoke on start up
Discussion
Hi all... ok so this is driving me mad. just cant get to the bottom of it...
i have a navara pickup with a 2.7 terrano tdi in it.
on cold start it bellows out white smoke, runs rough, then stalls. i can rev through it with a bit of throttle (to avoid stalling) but the strange thing is, after that the engine runs, pulls and starts just fine, until the next day.
at first it was intermittent, now its every morning. changing the fuel filter cured it for a few weeks. now its back and worse than ever.
glow plugs work perfectly.
heres a vid of it: http://cloud.cliffdesign.co.uk/cE9B
my hunch is air or water... any thoughts?
i have a navara pickup with a 2.7 terrano tdi in it.
on cold start it bellows out white smoke, runs rough, then stalls. i can rev through it with a bit of throttle (to avoid stalling) but the strange thing is, after that the engine runs, pulls and starts just fine, until the next day.
at first it was intermittent, now its every morning. changing the fuel filter cured it for a few weeks. now its back and worse than ever.
glow plugs work perfectly.
heres a vid of it: http://cloud.cliffdesign.co.uk/cE9B
my hunch is air or water... any thoughts?
Max_Torque said:
1) Check glow plugs - done!
2) Check it cranks at a decent speed (no knackered battery or stater motor)
3) Do a cold cranking compression test
4) Log, ideally using an OBD tool, the fuel rail pressure prior to, during, and after a start event. You could also use a multimeter to read the pressure sensor output, but it's not ideal, as you want to see pressure vs engine speed. (worn HP pumps are less efective at low speed, leading to low rail pressures at cranking)
5) If that all looks normal, out with the injectors and get them tested and re-conditioned
Great help thanks, but I'm not equipped well enough to investigate 2, and 3 at home :-/2) Check it cranks at a decent speed (no knackered battery or stater motor)
3) Do a cold cranking compression test
4) Log, ideally using an OBD tool, the fuel rail pressure prior to, during, and after a start event. You could also use a multimeter to read the pressure sensor output, but it's not ideal, as you want to see pressure vs engine speed. (worn HP pumps are less efective at low speed, leading to low rail pressures at cranking)
5) If that all looks normal, out with the injectors and get them tested and re-conditioned
And it's not a common rail so 4 is irrelevant...?
And a friend of mine fixed a similar problem with a new alternator. The crank speed was just slow enough to cause a problem, although barely noticeable with the ear/eye.
Just flagging this up again - not fixed yet.
The mechanics are saying "if an injector is leaking, then it would run rough ALL of the time because the bad one is throwing a bad spray pattern"
Tomorrow am I'm going to start it - fresh in the morning - in front of the guy from the garage to show him whats going on.
Is there any milage in what they're saying? would be great if I could be armed with some reasoning to counter/agree with that statement.
I think the engine gets hot enough to overcome the bad spray OR it might be running bad, I just can't tell! It's a leggy old diesel, not exactly a BM straight 6. :-)
The mechanics are saying "if an injector is leaking, then it would run rough ALL of the time because the bad one is throwing a bad spray pattern"
Tomorrow am I'm going to start it - fresh in the morning - in front of the guy from the garage to show him whats going on.
Is there any milage in what they're saying? would be great if I could be armed with some reasoning to counter/agree with that statement.
I think the engine gets hot enough to overcome the bad spray OR it might be running bad, I just can't tell! It's a leggy old diesel, not exactly a BM straight 6. :-)
Gassing Station | Engines & Drivetrain | Top of Page | What's New | My Stuff