SMOKE FROM EXHAUST

  • Tiny
  • cutter1041
  • 1995 Saturn SC2
  • 4 CYL
  • FWD
  • manual

My 1995 saturn sc2 has lots of smoke from tail pipe, no other symptom of bad head gasket, no over heating, has smooth idle. No oil in antifreeze no antifreeze in oil. No bubbling in antifreeze. Nothing leaking from car

Monday, November 22nd, 2010 AT 10:12 PM

7 Answers

  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

What color is the smoke? If it's white then it is antifreeze, if black, it's too much fuel(rich) if it's blue, the engine needs rings or pistons.

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Monday, November 22nd, 2010 AT 10:16 PM
  • Tiny
  • Ernest Clark
  • Expert
  • 1,759 posts

What color is the smoke. And do you have to add oil frequently (bluish/grey or dark smoke)? Also, if you have a blown head gasket (white or light colored smoke), you might not overheat right away, or get coolant in the oil.

But if it is a blown head gasket, you will eventually start overheating to the point you won't be able to drive over 50-60 without quickly overheating.

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Monday, November 22nd, 2010 AT 10:19 PM
  • Tiny
  • cutter1041
  • Member

Bluish white. And I drove the car forike 45 mins it dont overheat or idle rough I klnow these rmsymptoms of bad head gasket. But it only has the smoke problem. Car runs great besided that

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Monday, November 22nd, 2010 AT 10:36 PM
  • Tiny
  • Ernest Clark
  • Expert
  • 1,759 posts

There's only three possible sources of smoke coming from a tail pipe. The most common is oil burning. That usually shows up as a bluish or darker smoke. Coolant always is white with a sweet odor. The third and most rare, is transmission fluid. And that's always mixed in with coolant.

The reason it's rare: most cars have transmission cooler lines running to the radiator. Sometimes the radiator will develop an internal crack that allows tranny fluid to mix with the coolant. Then if there's also a blow head/intake gasket, both fluids will burn out the tail pipe.

Tranny fluid will always burn white as well, but much thicker.

As for your problem, when you drove your car, did you get on the highway with speeds in excess of 50-60? The reason I'm telling you the car may not necessarily overheat is this: I recently had an Olds Aurora with a 3.5 V6 and a blown head gasket. There's no question I knew what the problem was, but I couldn't fix it right away.

Knowing what I know, I stayed off the highway, kept my sustained speed under 50 and made sure the fluid was always topped off and bled of air.

I could drive around for hours without overheating.

So back to your issue. Pull the resevoir cap, and while someone revs your motor up and down past 1500 rpms, look at the coolant and any signs of large bubbles. If there's any, you have a blown head gasket.

Next dip your finger in the tail pipe and smell it. If it's sweet, blown head gasket. If it's oily, you're burning oil.

If you eliminate the coolant as a possible source, do a compression check on each cylinder. This'll tell you if it's oil and where it's coming from.

Keep in mind, after so many miles, all motors wear internally and begin to smoke from the tail pipe.

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Monday, November 22nd, 2010 AT 11:01 PM
  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

You could also do a block test its more accurate than a finger.

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Tuesday, November 23rd, 2010 AT 12:11 AM
  • Tiny
  • cutter1041
  • Member

The smoke smells like oil, so im not sure if its ahead gasket.

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Tuesday, November 23rd, 2010 AT 3:14 AM
  • Tiny
  • merlin2021
  • Expert
  • 17,583 posts

Check compression

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Tuesday, November 23rd, 2010 AT 8:10 AM

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