Smoke upon starting
Thread Starter
2nd Gear
Joined: Jun 2018
Posts: 2
Likes: 0
From: Oklahoma
Smoke upon starting
I don't know if i am posting this to the correct area or not, any help would be apprecited.
I purchased a 1985 corvette for my son, his first car. Test drove car, did not smoke upon starting. Decided to purchase car yesterday. Car was low on fuel so filled it up after purchase. I did not ask the man I purchased it from which octane he was running in it, however had some family members tell me to use high octane, as it would be better for the car. Well, long story short after I filled it up with 93 octane I noticed it blows a puff of smoke upon starting of car. It doesn't smoke when driving, just when starting. My question is, is this due to running a higher octane that has been in it previously or something else? Just strange the I didn't see it during test drive or when I started it the day of purchase. Any knowledge of this would be greatly appreciated!!
I purchased a 1985 corvette for my son, his first car. Test drove car, did not smoke upon starting. Decided to purchase car yesterday. Car was low on fuel so filled it up after purchase. I did not ask the man I purchased it from which octane he was running in it, however had some family members tell me to use high octane, as it would be better for the car. Well, long story short after I filled it up with 93 octane I noticed it blows a puff of smoke upon starting of car. It doesn't smoke when driving, just when starting. My question is, is this due to running a higher octane that has been in it previously or something else? Just strange the I didn't see it during test drive or when I started it the day of purchase. Any knowledge of this would be greatly appreciated!!
Burning Brakes
Joined: Apr 2017
Posts: 1,052
Likes: 290
From: Farmington MO
I don't know if i am posting this to the correct area or not, any help would be apprecited.
I purchased a 1985 corvette for my son, his first car. Test drove car, did not smoke upon starting. Decided to purchase car yesterday. Car was low on fuel so filled it up after purchase. I did not ask the man I purchased it from which octane he was running in it, however had some family members tell me to use high octane, as it would be better for the car. Well, long story short after I filled it up with 93 octane I noticed it blows a puff of smoke upon starting of car. It doesn't smoke when driving, just when starting. My question is, is this due to running a higher octane that has been in it previously or something else? Just strange the I didn't see it during test drive or when I started it the day of purchase. Any knowledge of this would be greatly appreciated!!
I purchased a 1985 corvette for my son, his first car. Test drove car, did not smoke upon starting. Decided to purchase car yesterday. Car was low on fuel so filled it up after purchase. I did not ask the man I purchased it from which octane he was running in it, however had some family members tell me to use high octane, as it would be better for the car. Well, long story short after I filled it up with 93 octane I noticed it blows a puff of smoke upon starting of car. It doesn't smoke when driving, just when starting. My question is, is this due to running a higher octane that has been in it previously or something else? Just strange the I didn't see it during test drive or when I started it the day of purchase. Any knowledge of this would be greatly appreciated!!
Thread Starter
2nd Gear
Joined: Jun 2018
Posts: 2
Likes: 0
From: Oklahoma
Thank u for the response. Went out and started this morning, no smoke but smells like it's running rich. I am far from a car guru, so think I will let my mechanic look into it. Thanks again.
Burning Brakes
Joined: Apr 2017
Posts: 1,052
Likes: 290
From: Farmington MO
Team Owner
Joined: Jul 2004
Posts: 28,461
Likes: 3,288
From: Hartford WI
I don't think it has anything to do with octane. Maybe it has a gasket leaking coolant into the chambers or oil leaking through the valve stem seals. Without pressure testing, hard to say. As to running rich, I'd change the O2 sensor since it probably was never changed and scan what the ECM sees to figure out if it is really rich or imagination rich.
Le Mans Master
Joined: May 2006
Posts: 7,708
Likes: 266
From: indy indiana
a puff of blue smoke when starting , then nothing, is usually a sigh of valve seals being worn. Its starts when the car sits for a time. when it gets worse, it will do it every time when starting. parts are cheap if you do it yourself, There are only three kinds of color from a car. blue is oil, black is fuel and white is coolent. best of luck and if it isnt bad, I would let it worry me for a while
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