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Old 01-23-2021, 07:01 PM
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Location: Walnut Creek, CA & 1,150 miles S of Key West
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Hyundai Diesel - White exhaust smoke

I used to post here a lot and got good advice when I needed it. I need some diesel help now.

I am in South America currently and own a 2007 Hyundai Santa Fe with a 2.4l CDI turbo motor.

It runs good, but its not a race car. The car has been sitting for 5 months. This morning when I flew in and fired it up it billowed white exhaust smoke. A 30'x30' cloud each time it was started. Also had a knock at idle which went away as RPM's were raised. Smoke increased impressively with more RPM.

Scanned it and it has code PO101 Mass Air Circuit range, PO336 Crank Position Sensor "A" circuit range and then PO101 again. Erased them and they came back.

White smoke would be un-burnt fue rightl? Would PO336 cause that? Would it even start with a bad Crank Sensor?

Any and all suggestions of what to look at would be appreciated.

Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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Old 01-23-2021, 07:56 PM
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White is usually water. Black is unburned fuel. Blue is usually oil.

May have water in fuel all the way to coolant intrusion. I would check the fuel filter for water for starters.
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Old 01-23-2021, 08:07 PM
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White can be water, but also unburnt fuel. On a cold start or with low compression, it isnt unusual to see white smoke. When I had a glow plug go out on my diesel (a 2.5L mitsu), it blew a cloud of white smoke until the block heated enough. Bad timing would certainly result in that situation...I assume being a newer model, the timing is electronic, or electromechanical (like VVT, etc) -- probably worth replacing thr crank sensor or at least inspecting the wiring leading to it. If it has been sitting, you might find that mice have found a nice meal of the wiring.

For clarification - black smoke is usually excess fuel, but while the engine is up to temp -- just dumping too much in beyond the combustion threshold/air can support. Lots of soot -- white smoke is practically vaporized diesel, totally unburnt.
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Old 01-24-2021, 02:58 AM
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Post White Exhaust

White smoke is oil or fuel .

White vapor clouds that disappate are coolant, .

I'd start it and run it a bit, it may simply be a cruddy injector spewing too much fuel or bad Diesel from sitting ~ keep an eye on the coolant temp .
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Old 01-28-2021, 11:28 AM
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From the po statement I would suspect no glow performance.
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Old 01-28-2021, 12:17 PM
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With all those codes specially the crank sensor range code, I would look at wiring damage first. Maybe rats or squirrels attacked it.

With a 0336 code the engine will be severely mistimed for injection and will billow unburnt fuel out the exhaust and sound like marbles when started. The MAF code can be bad wiring or even backwash into the inlet manifold from the breather setup.
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Old 02-28-2021, 03:42 PM
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Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
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It was a failed turbo. New one was installed and it is back to its old self.

Codes were due to low voltage from having sat for 6 months.

Thanks all for it input.

Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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