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2001 3.8 whitish smoke?
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billy101
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PostPosted: Tue Aug 02, 2011 4:21 pm    Post subject:  2001 3.8 whitish smoke? Reply with quote

Hi guys, yet another issue with my 3800. I don't think it's something horrible at the moment but I've been noticing that the entire day today there has been smoke coming out of the exhaust ONLY upon start up. I remote started my car after sitting overnight (14 hoursish?) It was hot outside so I remote started it while I was walking to the mailbox to grab today's mail...and I turned around when the car started and for some reason I saw a cloud of smoke in the air around the car. There was wind so it quickly left, but it looked slightly blue/white, more white than blue though. The car doesn't have any overheating issues, never has...haven't performed any mods lately..though I just replaced my PCV Valve about 500 miles ago, and I put Fuel Injector Cleaner in the last fill up (approx 200 miles ago). Could that have anything to do with it?

Thanks. I could get a video of the car starting tomorrow morning for y'all if that would help.
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chibiblacksheep
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PostPosted: Tue Aug 02, 2011 4:31 pm    Post subject:   Reply with quote

could be oil or antifreeze. which does it smell like?

The PCV Valve could not be fully seating and allowing some oil through.

Could be a valve seal.

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billy101
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PostPosted: Tue Aug 02, 2011 4:41 pm    Post subject:   Reply with quote

chibiblacksheep wrote:
could be oil or antifreeze. which does it smell like?

The PCV Valve could not be fully seating and allowing some oil through.

Could be a valve seal.


I've read a lot of places online that say it could be a valve seal. I just changed the oil 250 miles ago. I can't get a distinct smell from it. Are there any o-rings or seals that need to be put in place when changing the PCV Valve? I simply removed the old one and put the new one in.
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chibiblacksheep
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PostPosted: Tue Aug 02, 2011 4:42 pm    Post subject:   Reply with quote

The PCV valve DOES have an o-ring that you might have discarded if you didn't move it to the new one.

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billy101
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PostPosted: Tue Aug 02, 2011 4:53 pm    Post subject:   Reply with quote

chibiblacksheep wrote:
The PCV valve DOES have an o-ring that you might have discarded if you didn't move it to the new one.


Hm, when the motor cools off I'll pop off the MAP sensor, and get in there and check and possibly replace it if needed.
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Lingenfelter
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PostPosted: Tue Aug 02, 2011 9:18 pm    Post subject:   Reply with quote

Coolant will have a sweet smell to it when it's burning. Oil will be black or blue smoke.

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billy101
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PostPosted: Tue Aug 02, 2011 9:23 pm    Post subject:   Reply with quote

Lingenfelter wrote:
Coolant will have a sweet smell to it when it's burning. Oil will be black or blue smoke.


Turns out it's not white smoke. It's definitely black and I recorded a video of it. Video is uploading right now. I'll add it to this thread once it's done uploading.
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PostPosted: Tue Aug 02, 2011 9:27 pm    Post subject:   Reply with quote

Black typically means you are running rich... check your FPR

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billy101
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PostPosted: Tue Aug 02, 2011 9:34 pm    Post subject:   Reply with quote

bbengineer wrote:
Black typically means you are running rich... check your FPR

BBEngineer


Even when just first started? Would that explain why it's been having poor acceleration as well as why I only got 14.3MPG last tank, I got about 201 miles to my last tank.
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PostPosted: Tue Aug 02, 2011 9:37 pm    Post subject:   Reply with quote

If you are running rich, it will kill your gas mileage

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billy101
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PostPosted: Tue Aug 02, 2011 9:39 pm    Post subject:   Reply with quote

bbengineer wrote:
If you are running rich, it will kill your gas mileage

BBEngineer


Surprised it didn't throw a CEL. Here's a video for you all.

http://s1197.photobucket.com/a.....EO0010.mp4
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PostPosted: Tue Aug 02, 2011 10:28 pm    Post subject:   Reply with quote

If it was on first start only, after an overnight sit, I'd say it's oil seeping down around worn valve seals.

Since it did it on the second start too, I'm leaning towards a rich cold start. If the o2 sensor is old, it has probably drifted and is reporting leaner than actual, then fuel trims will start adding fuel.

A new o2 sensor may help the mileage, and the cold start puff.

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billy101
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PostPosted: Tue Aug 02, 2011 10:36 pm    Post subject:   Reply with quote

john_d wrote:
If it was on first start only, after an overnight sit, I'd say it's oil seeping down around worn valve seals.

Since it did it on the second start too, I'm leaning towards a rich cold start. If the o2 sensor is old, it has probably drifted and is reporting leaner than actual, then fuel trims will start adding fuel.

A new o2 sensor may help the mileage, and the cold start puff.


Yeah, that's what I was thinking when it started this morning after sitting overnight- just some blow-by. But since it's doing it on every start running rich sounds about right. I mean...I'm not going to throw money at it until it's fixed, should I simply wait until it throws a code and go from there?
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PostPosted: Tue Aug 02, 2011 10:46 pm    Post subject:   Reply with quote

If the o2 sensor has drifted, it could go a long time without throwing a code.

Some folks say they have "refreshed" a sensor by heating it with a propane torch, but that could just be an old wives tale. If the car has 100k and is still on the stock o2 sensor, it's probably time for a new one.

(assuming it's not some mechanical problem, this would be a good part to do anyway, without throwing parts at it)
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PostPosted: Tue Aug 02, 2011 10:53 pm    Post subject:   Reply with quote

john_d wrote:
If the o2 sensor has drifted, it could go a long time without throwing a code.

Some folks say they have "refreshed" a sensor by heating it with a propane torch, but that could just be an old wives tale. If the car has 100k and is still on the stock o2 sensor, it's probably time for a new one.

(assuming it's not some mechanical problem, this would be a good part to do anyway, without throwing parts at it)


It is possible that they are the original O2 sensors. The car has 117,287 miles on it. The cat was replaced because it went bad around 75k miles and was replaced under the recall; not sure if they would replace the sensors then or not.
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