Blue smoke when starting....:( (fixed) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-28-2011, 09:51 PM   #1
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Default Blue smoke when starting....:( (fixed)

Hey guys,

As most of you know, I replaced my LIM gaskets, valve cover gaskets, new UIM with gaskets, and throttle body gaskets two weeks ago. This last weekend, I did a complete coolant flush and refilled with green "mixes with any" antifreeze.

Today when I start my car, i notice a large cloud of blue smoke (burning oil at start) coming from the exhaust for about 5 seconds. It clears out and I don't notice it while driving. I'm sure the problem has been apparent the last two weeks since replacing the LIM gaskets but with my remote start, I am generally not around the car when it starts to notice this.

So my question, is what did I mess up? The car always used oil, but never had blue smoke when starting. The UIM came with 12 small rubber O-ring gaskets, in which I didn't use since I couldnt locate where they went. I initially thought around the UIM bolts, but the old ones didn't have any so didn't think they needed to be used? Where do these O-ring washers go? I thought they may have been for a supercharged motor but not certain...

So please let me know what I did wrong. The car doesnt leave any oil drips so its leaking and burning internally and is represented by the blue smoke. I REALLY hope its just within the UIM and not taking everything all apart again. Please post your replies as I want to get this fixed ASAP!

Thanks guys!
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Old 03-28-2011, 10:10 PM   #2
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Could just be some sludge knocked in on reassembly. Does it happen at every start up?
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Old 03-28-2011, 10:16 PM   #3
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It'* unlikely you messed up anything. The oil is a different system within your engine. Smoke at start up is a bad valve seal. With a few tools and a afternoon you can fix it yourself. New seals are under $20. You can reuse your valve cover gaskets seeing they are new.

Remove the spark plugs
Remove the valve covers.
You will need a compression tester, this allows you to hook up a air hose to pressurize the cylinder.
You will need a valve spring compressor.
VERY IMPORTANT, do no drop any of the keepers, if they fall in the engine your going to have a real problem. Magnets are your friend here.
Pull off old valve seal.
Push on new valve seals. The vitron seals from ZZP are a snap to push on.
Put valve spring back on
and move on.

Move slow, and watch what your doing.
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Old 03-28-2011, 10:22 PM   #4
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Im just convinced it has something to do with the repair...the car has never had blue smoke while starting before the repair....and I have just noticed it today while starting it each time.

I'm just beside myself as I was so careful while doing everything and I'm so anal about cleanliness and making sure everything fits properly....I took a video that im giong to post shortly of the car starting....
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Old 03-28-2011, 10:37 PM   #5
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Heres the video of the start up..

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Old 03-28-2011, 10:41 PM   #6
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Your sure you smell oil in the exhaust? Generally a leaking valve seal will do this on a cold start, but not a hot start.
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Old 03-28-2011, 10:48 PM   #7
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I cant smell anything while driving it, although its back in the twenties here and im not driving around with the windows down...and I haven't checked it on a warm start...I can try that tomorrow and see what the deal is..
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Old 03-28-2011, 10:49 PM   #8
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oil level too high could cause this.
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Old 03-28-2011, 11:03 PM   #9
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I oil level seems to read a little low, but my car is rarely ever on a flat surface, I will check the oil level tomorrow as well, would be very happy if that were the case!
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Old 03-29-2011, 08:49 AM   #10
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Check the PCV, while it shouldn't be doing that.. it'* the only other place oil can enter your intake tract.
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