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Old 09-29-2011, 12:01 AM   #1
bleong3292
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white smoke from the end of the exhaust

Ok, so I'm blowing white smoke out the back of my exhaust. Not a lot, but enough to worry me.

101k miles, 2000 prelude base. Smoke before I did exhaust work.
MPG sucks. Coolant level not low, did a compression test and (cylinder right of the block to the left) I got 162, 163, 165, and 170 psi, took a scope and looked at the piston heads and see carbon but not oily.

Might be a partially clogged pcv valve causing more vacuum that might suck some oil into the intake manifold. But Idk.
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Any ideas? I work at a shop so tool are not a problem.

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Old 09-29-2011, 11:39 PM   #2
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white smoke is indication of burning coolant. Compression test will usually not give accurate results in headgasket diagnosis. Try a leakdown test instead. The headgasket can also act as a one way valve and allow coolant in and compression in. Do a coolant system pressure test. Only other substance that I know makes white smoke is seafoam
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Old 09-30-2011, 06:17 AM   #3
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Quote:
Originally Posted by gearshredder View Post
white smoke is indication of burning coolant. Compression test will usually not give accurate results in headgasket diagnosis. Try a leakdown test instead. The headgasket can also act as a one way valve and allow coolant in and compression in. Do a coolant system pressure test. Only other substance that I know makes white smoke is seafoam
Very good advice. I would say he's spot on there.
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Old 09-30-2011, 01:30 PM   #4
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Did you over fill your oil?
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Old 09-30-2011, 05:01 PM   #5
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I had the same problem, blown headgasket.
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Old 09-30-2011, 05:56 PM   #6
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Quote:
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Did you over fill your oil?
unless mistaken, that would blue smoke. fuel is black smoke
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Old 10-02-2011, 01:17 PM   #7
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ill go do a coolant pressure test tmw, but i know im burning oil as well, the tech followed me one time and said i was burning oil. no i didnt overfill the oil when i changed my oil.
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Old 10-03-2011, 05:11 AM   #8
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[QUOTE=bleong3292;2848665]ill go do a coolant pressure test tmw, but i know im burning oil as well, the tech followed me one time and said i was burning oil. no i didnt overfill the oil when i changed my oil.

Engine leak down test is the best thing to do...If you want to find out if your headgasket is going bad. (air bubbles will be coming out from the radiator)
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Old 10-08-2011, 07:51 PM   #9
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Quote:
Originally Posted by gearshredder View Post
unless mistaken, that would blue smoke. fuel is black smoke
yeah gearshredder is right white= coolant blue= oil black=fuel
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Old 10-09-2011, 09:09 AM   #10
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Quote:
Originally Posted by gearshredder View Post
white smoke is indication of burning coolant. Compression test will usually not give accurate results in headgasket diagnosis. Try a leakdown test instead. The headgasket can also act as a one way valve and allow coolant in and compression in. Do a coolant system pressure test. Only other substance that I know makes white smoke is seafoam
Exactly...
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Old 10-19-2011, 05:40 PM   #11
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good luck on that man. but yea white smoke would coolant. blue is oil.
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Old 10-20-2011, 04:31 AM   #12
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same thing was happening to me whith other symptoms aswell it was the head gsaket hope its not same for you, good advice above check to see if you bubbles coming out of coolant. something you can try is in the morning before you start up car open rad cap top off coolant and with cap off start car check to see if coolant spits/bubbles out, if it does you have gases in your system and its probly head gasket. I did that test on my car and it shot out pretty good. when the mechanic did pressure test and compression test on my car prior to finding out it was head gasket the numbers on those test were good also like yours.
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