Smoke @ Exhaust
06-04-2002, 03:55 PM
#1
Instructor
Thread Starter
Smoke @ Exhaust
Saw an SC the other day. Decent body with original paint (but dings in 1 fender & door) and so-so interior (needs headliner, dash & sports seats have to be recovered).
My main concern, however, was smoke at the exhaust. The car smoked alot when started (for 2-3 mins). HOWEVER... it hadn't been started in 6 weeks- the battery was discharged & took several cranks over a period of time before starting (so it was fairly flooded by that stage). The motor seemed to run out fairly well: maybe a little rough but it really didn't get up to operating temp.
Anyway, it obviously wasn't the best situation to view the car. My question is, would it be expected that after this period of inactivity & starting procedure the car would blow out alot more smoke than normal, without necessarily indicating that the valve guides are going & a top-end job could be looming?
thanks for any input
My main concern, however, was smoke at the exhaust. The car smoked alot when started (for 2-3 mins). HOWEVER... it hadn't been started in 6 weeks- the battery was discharged & took several cranks over a period of time before starting (so it was fairly flooded by that stage). The motor seemed to run out fairly well: maybe a little rough but it really didn't get up to operating temp.
Anyway, it obviously wasn't the best situation to view the car. My question is, would it be expected that after this period of inactivity & starting procedure the car would blow out alot more smoke than normal, without necessarily indicating that the valve guides are going & a top-end job could be looming?
thanks for any input
06-04-2002, 06:52 PM
#2
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Join Date: Mar 2002
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I have been wondering about this myself - dreading the top end rebuild on my 85,xxx mile 87.
Lately, when it sits for a month - it sends out a big puff of smoke when started - just a puff and immediately goes away. Smoke is white so moisture was my original diagnoses - but its hard to tell white from light grey/blue. I have set up a dehumidifier in my garage and still get the white puff. Never smokes after initial startup or subsequent startups over the next few days/drives - only when it sits for too long.
So- If the car is smoking for 2-3 minutes after startup, sure sounds like quite a few drops of oil are sitting in the combustion chamber.
Rule #1 when selling any vehicle - charge the battery and make sure car is warmed up before buyer shows up.
Lately, when it sits for a month - it sends out a big puff of smoke when started - just a puff and immediately goes away. Smoke is white so moisture was my original diagnoses - but its hard to tell white from light grey/blue. I have set up a dehumidifier in my garage and still get the white puff. Never smokes after initial startup or subsequent startups over the next few days/drives - only when it sits for too long.
So- If the car is smoking for 2-3 minutes after startup, sure sounds like quite a few drops of oil are sitting in the combustion chamber.
Rule #1 when selling any vehicle - charge the battery and make sure car is warmed up before buyer shows up.
06-04-2002, 07:40 PM
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Join Date: May 2002
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Hi guys<
It wouldn't hurt to have your car checked out by a good mechanic... disclaimer, disclaimer, disclaimer, BUT, that said, all 911's will smoke upon start up. Some more often than others. I don't think I've ever heard/read a good explaination why. I don't think even Bruce Anderson knows the exact cause, although he will also tell you that it's "normal" for a 911. Mine has done it as long as I've owned it. Sometimes it'll go days without smoking, sometimes it'll smoke on almost every start-up. Unless your car is constantly smoking, you're probably OK. <img src="graemlins/bigok.gif" border="0" alt="[thumbsup]" />
It wouldn't hurt to have your car checked out by a good mechanic... disclaimer, disclaimer, disclaimer, BUT, that said, all 911's will smoke upon start up. Some more often than others. I don't think I've ever heard/read a good explaination why. I don't think even Bruce Anderson knows the exact cause, although he will also tell you that it's "normal" for a 911. Mine has done it as long as I've owned it. Sometimes it'll go days without smoking, sometimes it'll smoke on almost every start-up. Unless your car is constantly smoking, you're probably OK. <img src="graemlins/bigok.gif" border="0" alt="[thumbsup]" />
06-04-2002, 09:40 PM
#4
If I had to hazard a guess as to why 911's smoke when they start it would be because the ending is horizontal oil seeps past the rings causing the smoke, if I park mine sideways on an incline it smokes more than normal sort of reinforcing my theory. As for large amount of smoke on a car that has sat a long time this is normal, over time the rings lose their seal, after running for a day or two they should be back to normal. When I bought my car from my brother it had sat without running for two years and smoked badly the first two days, now just a puff on start up. I did a leakdown anyway and although I have since forgotten the numbers, they were well within spec.
