Smoke from engine area when driving in 4wd!? - Page 2 - Kia Forum

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post #11 of 17 (permalink) Old 04-18-2019, 12:02 AM Thread Starter
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What kind of mileage did you get on short trips with lots of stop-start driving?

I'm yet to take it on a long trip of highway driving, so I couldn't say yet what kind of efficiency I'm getting on the highway. But on city streets it is pretty damn bad..

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post #12 of 17 (permalink) Old 04-18-2019, 02:03 AM
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Originally Posted by ZacMonkeys View Post
So this dog clutch in the transfer case, If it hasn't been activated in a long while could it be seized (or very tight) and hence overheat when engaged, especially if the transfer case is low on oil? I suspect the previous owner of this vehicle has not used 4wd in a very long while, and I also suspect that nothing but the engine oil has been checked or changed in a long time, possibly ever..

I wish I had time today to look into this further, but I'm off for the Easter long weekend (not driving this car, thankfully).

I haven't heard of anyone getting 10l/100km on the 3.5l V6 petrol Sorento, but I have read reports of being able to get around 15l/100km if everything is working correctly with somewhat conservative driving.
Dog Clutch is not a friction clutch: https://en.wikipedia.org/wiki/Dog_clutch

Fuel Consumption: Sorry, given your location I presumed diesel. My V6 returned 22 mpg (Imperial) over 50k miles.


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post #13 of 17 (permalink) Old 04-18-2019, 05:45 AM
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Originally Posted by ZacMonkeys View Post
By gear oil, do you mean transfer case oil?

I thought it could be the brakes as well, so I have serviced the brakes recently. The rear calipers were a bit tight initially and hard to press out, but I think they are OK now. Maybe I'll take another look at them. The rear pads are due to be replaced soon anyway.
Yeah, the gear oil is in the transfer case and the rear differential. I would change both if they've never been changed. Then see where you're at.

If the calipers were hard to press, that means they're rusting out and they're going to get worse. It might not be your efficiency issue, but if they're hard to move like that, I would replace them soon.
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post #14 of 17 (permalink) Old 04-18-2019, 09:32 AM
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Originally Posted by ZacMonkeys View Post
What kind of mileage did you get on short trips with lots of stop-start driving?

I'm yet to take it on a long trip of highway driving, so I couldn't say yet what kind of efficiency I'm getting on the highway. But on city streets it is pretty damn bad..
I will presume you are talking to me. Around town I would get 15-18 MPG. The 3.5 had plenty of get up and go and I would use it sometimes.
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post #15 of 17 (permalink) Old 04-24-2019, 02:05 AM Thread Starter
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I will presume you are talking to me. Around town I would get 15-18 MPG. The 3.5 had plenty of get up and go and I would use it sometimes.
Well I'm definitely not getting close to that. I'm only getting around 12-13 MPG (18-10L /100km) at the moment.

I'm going to replace the rear brake calipers as I suspect it is actually those that are causing the issue. Since suggested in this thread I have noticed that I think I can feel something 'holding the vehicle back' slightly at times. Eg. it will decelerate more quickly than I feel it should a lot of the time, and conversely sometimes when rolling down a hill it will feel like it 'lets go' and the vehicle will start to roll at a higher speed.. Or it's all in my head, who knows.

I'm also going to replace the transfer case fluid and the fluid in both difs. On that note, can anyone link me where to find the torque specs on the drain plugs for these?
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post #16 of 17 (permalink) Old 04-25-2019, 01:46 AM Thread Starter
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Alrighty, so I replaced the rear calipers. The old ones were definitely a lot tighter than I originally thought.

Driving straight after replacing them and the car feels better in general, it doesn't seem to want to 'grab' on take-off.

I also found the source of the smoke when driving in 4wd. I had recently greased the front prop shaft and had left a bit too much external grease in the U joints. When engaging 4wd it must've spun some grease onto the exhaust, causing it to smoke. I've cleaned it off now, so I would assume that is going to fix the issue one the residual grease burns off the exhaust.

I also change the transfer case oil. Although the oil that came out was pretty dark, I put a magnet in the removed oil and found no metal shavings in there, so fingers crossed that means the transfer case is OK!

Now I just need to change the diff oils and the transmission oils. But that is a job for another day..
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post #17 of 17 (permalink) Old 04-25-2019, 01:16 PM
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Cool.. if there were no metal shavings or water in the drained oil, I'm sure you're fine there.
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