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Blue Smoke
MORE: Blue
smoke questions and answers
Car Blue Smoke Questions and Answers - This category contains featured
questions as examples. They relate to most vehicles.
Question: 1999 Oldsmobile Cutlass mileage: 120,000. I re-gasketed a previously
owned engine and put it in my car. I was traveling roughly at 65-70 mph when the
car lacked all power and gave the car behind me a blue smoke bath. I pulled over
at that time and checked the #4 spark plug and it was coated with oil. At that moment
I thought my valve seals were shot. I towed the car home, opened the subject up,
and found that along with valve seals the #1 exhaust valve had a pie slice hole
in it. In addition, the #4 piston had a hole in the top of it. I am not a certified
mechanic but I think though I may be wrong that the spark plugs that I was using
were at the wrong heat range. I was using AC Delco's rapid-fire. If you would tell
me why there was a hole in the piston and why there was a hole in the valve, I would
be very grateful to your service.
Answer: The problems with the exhaust valve and the failed piston are
probably due to that cylinder running lean. Check the fuel injector for that cylinder
and also look for vacuum leaks that would affect that cylinder. We do not think
the wrong heat range of spark plugs would cause the problem you describe.
Question: 1999 Probe GT V6-24V mileage: 188,000. Here's a weird one for you
guys, I've been noticing this for a long time and even asked local automotive repair
shops with no success. When I reach a stop sign (downhill) everything is fine but
when I start accelerating away the car smokes out the back...yet if I am at a level
stop sign and accelerate...it is fine.... I also noticed this when I take certain
turns too fast and accelerate...SMOKE.... I have no idea what this is.... HELP!
Answer: We have found similar problems with other cars approximately 140,000
or more miles. Replacing the valve stem seals reduces the oil use and smoke. They
are made out of rubber and over time become hard and brittle and no longer seal.
If that doesn't help you may have broken piston ring.
Question: 1999 Dodge Grand Caravan 125,586 miles. My Dodge Grand Caravan
is blowing blue smoke out of the tail pipe. I put new sparkplugs in it then I ran
it for a minute and checked one sparkplug for oil on it. There was oil on it. Please
tell me what is going on with it.Answer: Blue smoke is from oil burning.
Your engine has internal problems such as piston blow by, valve stem seal problems,
broken/worn piston rings, etc. It may be time for an engine overhaul.
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