jeep cherokee 2.7d black smoke
Discussion
What year and type of engine is it?
Smoke is from inefficient combustion, like too much fuel, not enough air, or injection timing.
Common rails are pretty smart, and would have spotted something. Injection pump engine could have the timing off, meaning the diesel is injected too late, and it's still trying to burn as it is heading out of the cylinders.
If someone has fitted a tuning box or it has had a dodgy remap, you'd get those symptoms with no faults showing.
Smoke is from inefficient combustion, like too much fuel, not enough air, or injection timing.
Common rails are pretty smart, and would have spotted something. Injection pump engine could have the timing off, meaning the diesel is injected too late, and it's still trying to burn as it is heading out of the cylinders.
If someone has fitted a tuning box or it has had a dodgy remap, you'd get those symptoms with no faults showing.
I can't believe no one has asked this yet...
Does it always do it or is it only the first time you put your foot down?
It's completely normal for a diesel to emit a (sometimes very substantial) cloud of smoke under acceleration, as it's blowing through soot and other particles that were in the exhaust system.
Does it always do it or is it only the first time you put your foot down?
It's completely normal for a diesel to emit a (sometimes very substantial) cloud of smoke under acceleration, as it's blowing through soot and other particles that were in the exhaust system.
If you've got any bluetooth code reader things that can log the data, checking to see if the boost has been raised is one, but then again, I've seen plenty where people have missed a limiter to the boost never changes.
If you could find someone who does remapping near you, they should be able to check, or if there isn't going to be any warranty issues, you could get MB to update or reprogram the ECU so you know it is entirely standard.
It's pretty common for people not to mention a remap when selling as it a) makes the car stand out as being powerful and b)doesn't give the impression they've been racing about in it.
I've no idea what someone would charge to check and return to standard, they might even be after full remap prices, it'd really depend on how helpful the guy feels like.
If you could find someone who does remapping near you, they should be able to check, or if there isn't going to be any warranty issues, you could get MB to update or reprogram the ECU so you know it is entirely standard.
It's pretty common for people not to mention a remap when selling as it a) makes the car stand out as being powerful and b)doesn't give the impression they've been racing about in it.
I've no idea what someone would charge to check and return to standard, they might even be after full remap prices, it'd really depend on how helpful the guy feels like.
As a Chrysler master tech yes the injectors do go out of tolerance and cause excessive smoking but still work so no dtc/ obvious fault is present often the only way to check is to remove and send off for testing we used northants diesel electric for this, also the black death as one of the previous posters called it is an issue with the seals on the base of the injectors fail and cause combustants to leak past causing smoking and poor fuel efficency.
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