Smoke puff on start up - Chrysler 300C Forum: 300C & SRT8 Forums
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post #1 of 18 (permalink) Old 11-27-2012, 06:53 PM Thread Starter
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Smoke puff on start up

I was going about 60 mph when two trucks started playing around of course they were racing from an intersection ahead. I decided to show them what a 300 can do from about a 1/8th mile behind them and after they were well behind me I decided to briefly top it out and back right out of it and all was well.
After setting the car in the garage for about an hour on restart I noticed light color grey smoke cloud puff from the tail pipes ..not steam.. but smoke just as it started. This smells like unburned fuel/ mis adjusted timing... not oil. It only did it once so far, is this a common problem with 5.7 Hemi's?
I ran it full throttle for about 40 seconds and right back down to 60 mph I have restarted it several times no smoke at all now
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post #2 of 18 (permalink) Old 11-27-2012, 07:17 PM
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Was it almost like a "shot" or was it consistent for a period of time? Might be you need a catch can.


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post #3 of 18 (permalink) Old 11-27-2012, 07:29 PM Thread Starter
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Originally Posted by black300csrt8 View Post
Was it almost like a "shot" or was it consistent for a period of time? Might be you need a catch can.


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It was like a burst I just restarted it again and it smells funky but no real smoke now..what does a catch can do for me? I have heard the term in here a lot but not sure what its function is totally.

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post #4 of 18 (permalink) Old 11-27-2012, 07:35 PM
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It was like a burst I just restarted it again and it smells funky but no real smoke now..what does a catch can do for me? I have heard the term in here a lot but not sure what its function is totally.
My SRT8 used to do that too after pushing it hard and restarting it after sitting for a while. The catch can fixed that. My understanding is that the catch can "catches" the blow by gasses that are funneled into the intake again from the PVC. If you really have a problem take a look at both sides of your throttle body for oily residue and shine a flashlight in the intake and look for oil pooling.


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post #5 of 18 (permalink) Old 11-27-2012, 07:48 PM Thread Starter
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Originally Posted by black300csrt8 View Post
My SRT8 used to do that too after pushing it hard and restarting it after sitting for a while. The catch can fixed that. My understanding is that the catch can "catches" the blow by gasses that are funneled into the intake again from the PVC. If you really have a problem take a look at both sides of your throttle body for oily residue and shine a flashlight in the intake and look for oil pooling.


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Would it show build up already at 2,130 miles? I have only done this one time and it was the first time I got on it on the roll. I have done fairly rapid to 0- 60 MPH maybe 2-3 times and let off since it was at 1500 miles
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post #6 of 18 (permalink) Old 11-27-2012, 09:17 PM
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It has been blowing oil into your intake for 2,130 miles. Yeah, it does it all the time, a bit more goes into the intake when the engine is pushed, such as a WOT pass.

The catch can installs in the PCV circuit and "catches" or traps the droplets of oil in that circuit, keeping most of them from going to the intake.

Some one once asked me how many HP having a catch can could get them. I told them they get to keep the HP they have for a longer period of time.

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post #7 of 18 (permalink) Old 11-27-2012, 09:43 PM Thread Starter
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I have a 3.3L V6 with 298,000 miles on it and it never smokes like this had earlier today

..if it is just pcv gasses then I am already relieved it wasn't something more serious and hopefully that is my actual issue. I was thinking I stressed something more serious. You know catch can it makes sense now ..I think I remember something on a Quad 4 Gm engine in the 80's called an oil separator it was a long black box along side the fuel rail and after about 5 years they always leaked oil out of it well at least if the junker engine ran long enough to leak it out. They didnt have an actual PVC valve system.
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post #8 of 18 (permalink) Old 11-28-2012, 03:44 PM
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I too have a 3.3 V6 from Chrysler...it doesn't release smoke on start up however if you pull the air cleaner assembly and look at the throttle body you'll see a nice film of oil. Every engine produces blow by gasses some more than others. I recall BMWs have a problem with consuming oil because of the high Compression Ratios they use which produces more blow by gases.


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post #9 of 18 (permalink) Old 11-28-2012, 04:20 PM Thread Starter
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Originally Posted by black300csrt8 View Post
I too have a 3.3 V6 from Chrysler...it doesn't release smoke on start up however if you pull the air cleaner assembly and look at the throttle body you'll see a nice film of oil. Every engine produces blow by gasses some more than others. I recall BMWs have a problem with consuming oil because of the high Compression Ratios they use which produces more blow by gases.


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I just had the intake high pressure cleaned on my 3.3 and the throttle plate coating was like tar before it was cleaned. I wonder why Chrysler has not addressed this issue with their flagship car that looks like a Ford Pinto when it starts..pretty bad when you cruise up next a a 75 Chevy C-10 in a parking lot and smoke comes out of your car and theirs starts smoke free..we wont mention their rust.but still they should put a catch can or equivalent on it from the factory, if street rodders are knowing what the issue is why dont Chrysler?.
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post #10 of 18 (permalink) Old 11-28-2012, 07:12 PM
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3.3 was a totally different engine with respects to the heads, PCV system and emissions controls. Not really a good comparison to the current engine.
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