"Doc" <docsavage20 (AT) yahoo (DOT) com> wrote

If the engine was fully warmed up, with the temperature gauge in the middle,
then yes, it looks like steam in the exhaust. Check the motor oil for a
milky appearance, check the radiator for signs of oil, check the spark plugs
to see if they are unusually clean, check compression for one or more low
cylinders. If one or more of those symptoms appear, then there is a good
chance that the engine needs work.
--

Ray O
(correct punctuation to reply)

As a follow-up, here's additional video. It shows the exhaust at
startup where it's a bit rough, then smoothing out, then some accel
and idle in park, also idle in drive, if it yields any additional
insights. I've damped the exhaust movement with a wood block to get
rid of the noise of the pieces rattling so you hear only the engine/
exhaust sounds. Outside temp high 70's to 80 deg.

About 1min, 2.6 megs.

http://home.mpinet.net/~docsavage20/engine_issue.wmv

On May 18, 1:35 am, "Ray O" <rokigawaATtristarassociatesDOTcom> wrote:

I appreciate it. The oil and coolant intermixture doesn't seem to be
noticeable but obviously something isn't right. Will check the plugs
and compression asap.

Something I don't get though, is why would the guage indicate
overheating when all the components that move the coolant appear to be
healthy? I.e. pump seems to be okay and the radiator, hoses,
thermostat are all fresh. Temp sensor is brand new.

Doc wrote:

That is stuffed, I would bet my left nut that all of your water loss is
going into the cylinder that is misfiring. If your rebuild is still
under warranty then take it back and get them to fix it. If not rip the
head off and check the gasket and get the head fully checked out, both
for flatness and chemically tested for cracks.

And don't start it any more, you may be lucky and not have any bent rods
yet.

Doc wrote:
Are you revealing that your engine is overheating? Or was that just a
hypothetical question? If the cooling system components are healthy
(your may not be) one cause would be pockets of air in the cooling
passages of the head. The air could be introduced by a breach from the
cylinder to cooling system (blown head gasket or cracked head or block).
Do you have white smoke pouring out of the exhaust when you start it up?

-jim

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"Doc" <docsavage20 (AT) yahoo (DOT) com> wrote

There are only 5 reasons why the temperature gauge would indicate
overheating.
1) The coolant temperature is too high and the temperature gauge is
indicating correctly
2) The temp sender is incorrect or faulty
3) The wiring between the temp sender and gauge has a problem like being
grounded
4) There is a problem with the gauge
5) There is air mixed with the coolant.

I forget what kind of car you have, but it probably has a viscous coupling
for the cooling fan. When the engine is cold and shut off, the fan should
spin freely. When the engine is hot and the engine is shut off, the fan
should not spin freely - IOW, it should be connected to the engine so when
the engine turns, the fan also turns. If the fan spins freely when it is
hot, then the coupling is bad and needs replacement because it is not
sucking air through the radiator.

Other things that can cause overheating:
The radiator could have a problem like an internal clog or there is debris
blocking air flow through the radiator.
Bad radiator cap
Improper coolant mixture - too much or too little antifreeze can cause
overheating.
Bad or improperly installed thermostat - if it is not oriented correctly or
it shifted before the housing was bolted down
Ignition timing is too advanced
Head or block problem
Blockage in the exhaust
Fuel mixture too lean
--

Ray O
(correct punctuation to reply)

Vash The Stampede wrote:

NORMAL?!? for an ambient teperature IN THE MID/HIGH 80s????

If it were 60 degrees or lower and the engine just started, I'd agree.
But I've NEVER seen a "normal" engine blow vapor like that at 85 degrees
ambient, even when just started.

I'd say it looks like that's where the coolant is going, especially if
exhaust vapor has a sort of sticky sweet smeel (presuming you're using a
glycol antifreeze).

"Hachiroku ????" <Trueno (AT) AE86 (DOT) gts> wrote

Hachiroku there are several of those small coolant hoses on your Supra. One
of them that you should keep an eye on is just a pipe end cap. It should be on
the exhaust side of the engine near the firewall.