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Old 09-22-2017, 09:13 AM   #1
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White smoke

Okay, so I got my car back from the dealership the other day. It's a 2012 mustang gt, I had white smoke coming out the exhaust. They said they fixed it, but I put my Steeda 101mm cai and SCT canned tune back on and it's smoking again. Could it just be the tune? I've heard that the SCT canned tunes aren't always the best. It doesn't smell like coolant, smells like gas. Doesn't overheat, just gets to operating temperature and smokes and smells.
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Old 09-22-2017, 10:10 AM   #2
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White smoke is either coolant or moisture. What did they say they did to it or what did they find if they actually "fixed" it? That would be some really helpful information to know.
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Old 09-22-2017, 10:14 AM   #3
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White smoke is either coolant or moisture. What did they say they did to it or what did they find if they actually "fixed" it? That would be some really helpful information to know.
Agreed
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Old 09-22-2017, 10:23 AM   #4
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Dealership told me it was a transmission line leaking into the exhaust system. Sounded fishy to me.
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Old 09-22-2017, 10:24 AM   #5
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Dealership told me it was a transmission line leaking into the exhaust system. Sounded fishy to me.
That is not possible. The trans has nothing to do with the exhaust.
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Old 09-22-2017, 10:25 AM   #6
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That is not possible. The trans has nothing to do with the exhaust.
They said it was a line to the cooler.
Still sounds like bull**** to me. Everyone I've talked to said it's bull****.
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Old 09-22-2017, 10:27 AM   #7
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They said it was a line to the cooler.
Still sounds like bull**** to me. Everyone I've talked to said it's bull****.
Yep, BS. The trans cooler is a closed system that has nothing to do with the exhaust.

That has to be the most creative lie I've heard today.
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Old 09-22-2017, 10:33 AM   #8
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Well, wait a minute...the transmission cooler lines DO run from the transmission to the front of the engine, so there is a possibility of a leaking line dripping on an exhaust pipe, depending on the routing of the line....and...transmission fluid burns white...Maybe it's residual fluid burning off or they didn't effectively repair the leak...
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Old 09-22-2017, 10:37 AM   #9
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Well, wait a minute...the transmission cooler lines DO run from the transmission to the front of the engine, so there is a possibility of a leaking line dripping on an exhaust pipe, depending on the routing of the line....and...transmission fluid burns white...Maybe it's residual fluid burning off or they didn't effectively repair the leak...
That's possible, but if it was leaking onto the pipes would it be coming out of them? That's where I get confused about it. Either way they said they fixed it and a cai and canned tune wouldn't do this.
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Old 09-22-2017, 10:40 AM   #10
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Oh, no, it wouldn't be coming OUT of the exhaust. So, smoke was coming out of your exhaust. You tool it to the dealer. Dealer repaired a leaking transmission cooler line and is still has white smoke coming out of the exhaust? You sure it's not just steam and you smell gas in it since you are tuned? If you remove the tune, it stops smoking altogether? We need to see a video of this....I mean, is it like seafoam like smoking?
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Old 09-22-2017, 10:44 AM   #11
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Oh, no, it wouldn't be coming OUT of the exhaust. So, smoke was coming out of your exhaust. You tool it to the dealer. Dealer repaired a leaking transmission cooler line and is still has white smoke coming out of the exhaust? You sure it's not just steam and you smell gas in it since you are tuned? If you remove the tune, it stops smoking altogether? We need to see a video of this....I mean, is it like seafoam like smoking?
Well the forum won't let me post the video.
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Old 09-22-2017, 10:46 AM   #12
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Originally Posted by Shadowfax_5.0 View Post
That's possible, but if it was leaking onto the pipes would it be coming out of them? That's where I get confused about it. Either way they said they fixed it and a cai and canned tune wouldn't do this.
You would see smoke coming from the front of the car, and under it. You would also smell burning trans fluid. It cannot blow out of the exhaust unless it enters a cylinder.
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Old 09-22-2017, 10:47 AM   #13
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To load a video you will need to first upload it to YouTube.
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Old 09-22-2017, 11:00 AM   #14
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Alright thanks
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Old 09-22-2017, 11:18 AM   #15
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Here's the YouTube link
https://youtu.be/HLrMHEGVymY
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Old 09-22-2017, 11:39 AM   #16
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That looks like condensation on a cold morning. You need to have a pressure test done to see if you have a problem with a head or head gasket.

Does the exhaust smell like coolant?

If you hold your hand, or a sheet of poster board behind the exhaust, does it get soaked?
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Old 09-22-2017, 11:45 AM   #17
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That looks like condensation on a cold morning. You need to have a pressure test done to see if you have a problem with a head or head gasket.

Does the exhaust smell like coolant?

If you hold your hand, or a sheet of poster board behind the exhaust, does it get soaked?
It's happening at operating temperature. And the dealership apparently did a pressure test, apparently nothing... But the smoke says otherwise. I'll test for moisture when I get the chance.
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Old 09-22-2017, 01:09 PM   #18
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But you said it smells like exhaust gas, not coolant.
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Old 09-22-2017, 01:15 PM   #19
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But you said it smells like exhaust gas, not coolant.
Yeah which is why I'm so confused
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Old 09-22-2017, 01:18 PM   #20
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Originally Posted by Shadowfax_5.0 View Post
Yeah which is why I'm so confused
It is possible that the tune has the car running rich. I would need to see the smoke on a different color background, and see the plugs.

White smoke is generally coolant. At this point you could have a head gasket leak that is extremely small causing the problem. Then again it could be the tune.

Return the car to the factory tune and evaluate the results.
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Old 09-22-2017, 01:20 PM   #21
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Return the car to the factory tune and evaluate the results.
This ^^
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Old 09-22-2017, 01:22 PM   #22
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This ^^
Alright I'll get on it
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Old 09-22-2017, 11:16 PM   #23
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What is the weather like where you live Shadowfax?
Is it sort of humid?
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Old 09-22-2017, 11:19 PM   #24
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What is the weather like where you live Shadowfax?
Is it sort of humid?
It's been quite humid out.
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Old 09-22-2017, 11:41 PM   #25
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The reason that I asked, is because we always start to get these white smoke questions around this time of year. The nights and mornings are cooler, the humidity starts to rise a bit, and you start to see more condensation from car exhaust. Even from engines running at operating temperature.

Here's a good test. In the heat of the day, go find a safe place to do a maximum effort pull. Clean her out real good, if you know what I mean. Then immediately pull over and observe the exhaust. If it is still smoking like in the video, you might have a problem. But if there doesn't seem to be much coming out, it is likely that you are just experiencing normal condensation, perhaps slightly compounded by a rich tune at idle.
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Old 09-23-2017, 05:53 AM   #26
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The reason that I asked, is because we always start to get these white smoke questions around this time of year. The nights and mornings are cooler, the humidity starts to rise a bit, and you start to see more condensation from car exhaust. Even from engines running at operating temperature.

Here's a good test. In the heat of the day, go find a safe place to do a maximum effort pull. Clean her out real good, if you know what I mean. Then immediately pull over and observe the exhaust. If it is still smoking like in the video, you might have a problem. But if there doesn't seem to be much coming out, it is likely that you are just experiencing normal condensation, perhaps slightly compounded by a rich tune at idle.
Very true.
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Old 09-23-2017, 02:43 PM   #27
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Looks like typical exhaust condensation vapor to me........a gallon of fuel produces at least a gallon of water vapor from the internal combustion process!!
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