**98 camry blue smoke**

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Old 29 Jan 2006, 03:40 am   #1 (permalink)
mcknight
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Default **98 camry blue smoke**

my 1998 camry blows blue colured smoke from the exaust after being park for
12 hours or so what could vbe causing that?


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Old 29 Jan 2006, 08:18 am   #2 (permalink)
Daniel
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Default Re: **98 camry blue smoke**

valve guides.
===========
answering your question was easy.
what to do about it is less simple.
Most mechanics will tell you to replace the valve guide seals.
Some people will tell you that blue smoke means you have engine sludge
which is a larger problem, but if the symptom is only on cold start, I
call it valve guide seals.
To my mind, the Toyota design for dual overhead cams is actually quite
brilliant.
There are four valves per cylinder. In the early days, adding those
extra valves were roughly the equivalent of turbo charging the engine
in terms of power increase over two valves.
Plus the valves are smaller and lighter so they can rev higher, and the
lower reciprocating mass means less wear on the valve train.
Because the camshaft is operating directly over the valves, no rocker
arms are required, and the force is directly vertical, so valve guide
wear is minimal since there is no "rocking" motion.
However, there is a puddle of oil on top of the heads directly over the
valves, so when they sit over night, a small amount can seep past the
valve guide seals, hence you see the blue cloud of smoke on cold start.
Some people say just ignore it since you're not burning any significant
amount of oil and the repair can be expensive. The best way to do the
repair is to force compressed air into the cylinders to hold the valves
closed so the seals can be replaced without removing the head.
The down side to the puff of smoke on cold start is that it tends to
foul the O2 sensor and catalytic converter with oil fumes. Although the
effect is small it can be cumulative.
Generally speaking, regarding all oil seals, they last longer when the
oil is kept clean, although the valve guide seals are a commonly known
weak point.
Your Camry runs slightly hotter than my '94, but at 140,000 miles I
have zero oil smoke on cold start, whereas when I bought the car with
85,000 miles I used to get quite a cloud of it in the mornings.
Here's what I did.
First, not trusting the prior owner's oil change schedule (although
they had copious records from day one) I changed the oil more
frequently. Sometimes after 500 miles, or even one week. I was
experimenting with different oils like Valvoline and Toyota brand. Then
reading about the benefits of fully synthetic oil, switched to Mobil 1,
10W30.
Then I read about auto-rx at auto-rx.com, so switched back to
conventional oil, added the auto-rx, drove 500 miles mostly on the
freeway, drained it out, and put the synthetic back in, also adding 20
per cent, Lucas heavy duty oil stabilizer.
Recently I've switched to Mobil 1 5W30. The car uses negligible amounts
of oil and I haven't seen that blue cloud of smoke on cold start for
years.
Read once someone had the valve guide seals changed, and apx. year and
a half later the symptoms returned.

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Old 29 Jan 2006, 08:25 am   #3 (permalink)
qslim
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Default Re: **98 camry blue smoke**

Worn valve stem seals.

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Old 29 Jan 2006, 08:10 pm   #4 (permalink)
Ice
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Default Re: **98 camry blue smoke**

I'd imagine it could be bad piston rings too. With the logic being
they are allowing oil to blow by until the expand from the heat. But
I'd probably suspect the valves first too.

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Old 29 Jan 2006, 11:12 pm   #5 (permalink)
Merritt Mullen
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Default Re: **98 camry blue smoke**

In article <1138587037.087134.67270@g14g2000cwa.googlegroups. com>,
"Ice" <joseph@vndinc.com> wrote:

> I'd imagine it could be bad piston rings too. With the logic being
> they are allowing oil to blow by until the expand from the heat. But
> I'd probably suspect the valves first too.


If we are talking about the V6, don't overlook the problem of clogged
baffles in the Valve covers. That forces oil into the intake manifold
causing the blue smoke.

Toyota recognizes this problem and has redesigned valve covers to replace
the originals. Replacing the valve covers is cheaper and easier than
trying to clean the baffles.

Merritt
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Old 30 Jan 2006, 12:27 am   #6 (permalink)
johngdole@hotmail.com
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Default Re: **98 camry blue smoke**

Blue smoke after parking for a while usually means leaking valve stem
seals. But don't ignore the more serious engine sludge problem, now
that you are at the end of the 8-year extended warranty.

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Old 06 Feb 2006, 09:58 pm   #7 (permalink)
Rob
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Default Re: **98 camry blue smoke**

switch to a high mileage oil and that will swell the valve seals and
stop the smoke.
may take a couple of oil changes but cheapest solution.

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