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#1 (permalink) Old 08-30-2005, 12:58 PM
red_rider_elsinore
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Smoking at startup

I've been reading the forums and I haven't found someone else with the same problem so I decided to start a thread.

When I turn on the car it shoots out a cloud of smoke out the exhaust. The "check engine" light is on and I had it diagnosed at Pepboys and they said I needed two new oxy sensors. I haven't changed them because I don't think that's the problem. I am confused with what could be the problem. I am thinking that the problem could be a leaking injector because the engine doesn't smoke once its running.
 
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#2 (permalink) Old 08-30-2005, 07:40 PM
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What colour is the puff of smoke? Blue, white or black/brown?
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#3 (permalink) Old 08-31-2005, 01:09 AM
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The color is blue.
 
#4 (permalink) Old 08-31-2005, 05:14 PM
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Valve Seals?
 
#5 (permalink) Old 08-31-2005, 06:13 PM
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if the smoke is blue I think there might be something wrong with engine oil.

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#6 (permalink) Old 08-31-2005, 07:59 PM
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From my experience in 2 other cars (Fords... I know, never again) it sounds like valve seals. If you don't know what that is, here's a simplistic explanation. The stem of each valve has a rubber (or something like it) seal around it. As the valve goes up and down it passes through these seals. If the hole in the seal is enlarged, more oil can pass thru. When the car sits for a while (like several hours) the oil collects around the seal and leaks into the combustion chamber. When you start the engine, PUFF, that excess gets burned off and you see it behind you.
Since I'm not a mechanic, I can't tell you why the oil doesn't get forced thru that seal constantly, under pressure. But the "disease" produces the symptoms you stated.
The good side is that you can still pass Inspection 'cause it only happens at startup and you're not really burning oil constantly.
Jim.

2005 RAV4 2wd
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#7 (permalink) Old 08-31-2005, 11:56 PM
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I had the same problem with my 96 RAV4.

VALVE SEALS
 
#8 (permalink) Old 09-01-2005, 12:13 AM
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Yup, blue smoke means oil is involved and almost always is valve seal problem. My 96 RAV4 has this problem too...occasional blue puff of smoke on start up. I keep an eye on oil level and usually have to add some between services (every 10,000 km). But i havent heard of this problem occuring on a 4.2 till now.
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#9 (permalink) Old 09-01-2005, 01:55 AM
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Garage
Quote:
Originally Posted by Mohit
Yup, blue smoke means oil is involved and almost always is valve seal problem.
My '96 has had this same puff of blue smoke on a COLD start for the past 50,000+ miles. I do keep an eye on my oil level. I've never had to add any oil... between my usual 5000 mile oil changes

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#10 (permalink) Old 09-01-2005, 01:57 AM
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Thanks for the info. I will see where I can get it fixed. Can larger valves be installed for more power or will it interfere with the variable-valve-timing.
 
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