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YOUR RESEARCHSmoke on start up - But only when previously stopped on cold engine & left overnight
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overcome
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Reported cause · Original poster
To overcome the issue when I move the car out of the garage to access the kids toys I tend to run it around the block and the issue is overcome.
Smoke on start up - But only when previously stopped on cold engine & left overnight
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Leading evidence: 'overcome' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'overcome' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check crankcase pressure' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
First thing to check is oil level and make sure it is not overfilled, next is check your crankcase pressure for possible AOS issue.
Smoke on start up - But only when previously stopped on cold engine & left overnight
Check oil level - always
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Suggestion
Definitely a good idea to check the oil level - always...
Smoke on start up - But only when previously stopped on cold engine & left overnight
Run when it was stopped, i have no issue
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Suggestion · Original poster
If the car is warm and has had a run when it was stopped, I have no issue.
Smoke on start up - But only when previously stopped on cold engine & left overnight
Test by pulling off the oil cap slightly
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Suggestion · Original poster
Is the Crankcase pressure tested by pulling off the Oil cap slightly to feel an suction?
Smoke on start up - But only when previously stopped on cold engine & left overnight
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I am getting smoke on the start up of my C4s 996 but under certain conditions. If the car is warm and has had a run when it was stopped, I have no issue. If the car is started for up a short time, like reversing it out of the garage, then left for around 12 hours (Overnight), I get smoke out of the exhaust for a couple of seconds. It is not out of both exhausts, but can appear out of a particular side. Sometimes the left and sometimes the right. No real pattern.
Smoke is light and rises pretty quickly.
To overcome the issue when I move the car out of the garage to access the kids toys I tend to run it around the block and the issue is overcome.
Can anyone shed some light on what this could be? Car runs great normally and had PPI which didn't pick up any issues. I only do 2-3k a year at weekends, so not often used.
Oil is level is at the mid point. I am not aware of the AOS every having been changed. Is the Crankcase pressure tested by pulling off the Oil cap slightly to feel an suction? IS there a more accurate way to tell if this is bad? I pulled the cap off slightly a couple of months ago and didn't feel any suction, but can recheck.
Definitely a good idea to check the oil level - always... AOS? Eh,... aos is usually a "cloud" of smoke on start up, and sometimes persists for way more than a few seconds. What the op describes sounds pretty typical - especially if it's a higher mileage (over 100k) car
Smoke for a few seconds at start up and only after brief usage and long rest? Don't worry about it and enjoy the car. If that's your only issue you are winning big time. Some brand new Porsches smoke at start up.
This a fairly common issue with the boxer engines. Picture the engine configuration and you'll see how the oil could settle in the cylinders on shutdown. Mine usually will occur if I start the car cold, re-position it for washing etc., and shut it down after about 30 seconds of running. Typically will get a puff of white smoke on the next start. Search and you'll see it's been reported for as long as there have been members in this forum. Nothing to worry about - just embarrassing if your neighbors are watching you pull out of the garage when it happens
