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Exhaust Smoke / Transmission Leak
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maxihXCVI
New User
Aug 3, 2018, 10:21 PM
Post #1 of 5
(1400 views)
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Exhaust Smoke / Transmission Leak
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I recently encountered some issues with my 2006 BMW 750Li. It currently has 94k miles on its 4.8l V8 Engine that ran very smooth so far.
I was driving on country roads braking for stop signs and accelerating a bit harder than usual when all of a sudden the transmission malfunction message comes on. After parking the car and putting it into park and restarting, the error was gone but when I pulled out I noticed some transmissions fluid on the ground. After two accelerations it started slipping again and the error came back on again. I had to get back home somehow, I had to drive slowly on the highway since the transmission wouldn't upshift into higher gears anymore. Limp mode?
After two days of letting the car sit and starting it up, it idles a bit rough and it feels like something is slightly shaking the car. After about 5 mins of idle when I hit the gas to rev the engine up to about 3k rpm there is smoke coming out of the exhaust. It smells pretty bad as well.
Could the transmission problems and the smoke be connected? Because they seemed to surface at the same time.
Here is a video of the smoke.
https://youtu.be/19b5qyrGhTM
There is no smoke at startup. Only after reving up for the first time.
(This post was edited by maxihXCVI on Aug 3, 2018, 10:22 PM)
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maxihXCVI
New User
Aug 4, 2018, 7:26 AM
Post #3 of 5
(1366 views)
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Re: Exhaust Smoke / Transmission Leak
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I know that can end in an even worse situation.
Since I got back, the car is parked and did not move at all just idled it once to check the warning light and code and then I noticed the smoke out of the exhaust.
I was just wondering if all these symptoms could be coming from the transmission. I know its impossible to know for certain until i get it properly evaluated but just to know if there is the possibility.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 4, 2018, 7:32 AM
Post #4 of 5
(1360 views)
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Re: Exhaust Smoke / Transmission Leak
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Anybody would need to know a lot more about the situation before coming to any conclusion.
For instance,
Are any fluids low?
Are any fluids contaminated?
What sort of smoke is it ie: oil, coolant or ATF
You really need an expert to make some observations and identify a few things.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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maxihXCVI
New User
Aug 4, 2018, 12:57 PM
Post #5 of 5
(1348 views)
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Re: Exhaust Smoke / Transmission Leak
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No engine oil or any other fluids are low.
The atf can’t get checked unless you have a lift.
The last thing is I can’t identify the smoke. I have uploaded a video of the smoke under this link: https://youtu.be/19b5qyrGhTM
Like I said it does not occur at startup or idle, only when I rev the engine up and then it stays for a while.
Like I said the system does not show anything abnormal. No check lights, no fluids low etc.
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