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Repair Topics / Blue Smoke

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.

New "How to Repair Guides"  -  Fuel Filter - Oil Filter - Air Filter - Radiator - Tune-Up

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.

Repair Topics / Blue Smoke

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