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Smoke out tail pipe after car sits over 5 hours

Tiny
ANONYMOUS
  • MEMBER
  • 1996 LEXUS ES 300
  • 209,000 MILES
Smoke out tail pipe after car sits over 5 hours . If I run the car 55 mph it never smokes when I start it. But if I run it 70 mph and then let it sit for 5 hours when I start it, it smokes, smells kinda like hot catalytic converter. Now it develop a miss in the engine. Could a coil be going bad
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Friday, November 9th, 2012 AT 9:59 PM

10 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
As far as the smoke goes sounds like worn valve stems letting oil drain down into valve into the combustion chambers causing the smoke. Tell more about the miss is it only at idle while under hard acceleration etc?
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Friday, November 9th, 2012 AT 10:53 PM
Tiny
GUNSHUFFLER0378
  • MEMBER
  • 10 POSTS
Miss is at idle. I can drive the car all week under 55 and no smoke, as soon as I run it hard and let it sit, it smokes thats why I didnt consider the valve seats
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Saturday, November 10th, 2012 AT 12:44 AM
Tiny
SATURNTECH9
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What color is the smoke after it sits on you start it?
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Saturday, November 10th, 2012 AT 4:49 PM
Tiny
GUNSHUFFLER0378
  • MEMBER
  • 10 POSTS
White remember when modulater valves would go bad on transmissions and it would suck the fluid out and burn it in the carb the thing would smoke and smell all the time. It smellls kinda like that
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Saturday, November 10th, 2012 AT 8:38 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
White thats odd not sure if you have a vaccum modulator valve on the transmission I will look and see.
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Sunday, November 11th, 2012 AT 2:19 AM
Tiny
GUNSHUFFLER0378
  • MEMBER
  • 10 POSTS
Great I drove the car 102 miles yesterday and the missing stopped ! It still smokes when you start it after it has been run hard
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Monday, November 12th, 2012 AT 11:31 PM
Tiny
IMPALASS
  • MECHANIC
  • 3,112 POSTS
WIth it being white smoke, are you sure it isn't a bad head gasket? How is the oil and antifreeze
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Wednesday, November 14th, 2012 AT 2:49 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Great point just didnt think of head gasket because it only does it on start up. Can also do a chemical block test.
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Wednesday, November 14th, 2012 AT 3:38 AM
Tiny
GUNSHUFFLER0378
  • MEMBER
  • 10 POSTS
Oil looks good
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Wednesday, November 14th, 2012 AT 10:45 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
You could do a chemical block test to try to see if there is coolant getting burned at start up. Because white smoke on start up is coolant or condensation in the exhaust.
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Wednesday, November 14th, 2012 AT 10:59 PM

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