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Haven't thought about running on vacuum for ages. The engine break-in procedure for my Triumph TR6 motorcycle (decades ago) prescribed high speed throttle cut off frequently for the first X-number of miles to lubricate the piston rings as they wore in. I recall doing this all the same weekend (or week).
I'm also having a similar issue after putting on a test pipe.
Most of the time it would happen right after stopping at a red light/stop sign and then getting the car moving. The car would blow a small/medium size smoke(grayish blue).
Changing the engine oil from Mobil 1 to Castrol made some difference. Another thing that made a difference is when I get off the gas pedal in mid-high rpm's, I don't let the engine run on vacuum, I put the car into neutral and let the car coast. I also swapped the valve cover/pcv to a 2004-05 system and that made no difference.
A good portion of it is fuel, that's why you don't see it with the oem cat in place as the hydrocarbons get converted to water , with test pipe you see it much easier. On my S2000 I would get a puff of smoke just as I lifted throttle and rpms dropped with the clutch disengaged, and just before the puff of smoke showed up my air-fuel gauge registered full rich for a brief second. It did that very consistently.
I continue to do testing on the street with my "other" high rpm Honda that was smoking a moderate amount from the tailpipe.
Since some simple recent changes the reduction in exhaust smoke has been dramatic. So far I added one bottle of Motor Oil Saver from Liqui Moly to oil sump, I also changed to Pennzoil Platinum 5w-40 Euro oil , and I added 150 ml of Lucas Upper Cylinder lubricant in the fuel tank. If it continues to work it will be a cheap way to address the issue, so far it seems pretty effective for relatively low effort and cost, with no negatives to report.
"Break-in" as in what did you do the first 1000 miles of that rebuilt engine? What kind of oil did you use, at first? How often did you change the oil?
"Breaking-in" new rings is critical for a long term oil consumption-free engine.
Oh i got it !
Sorry, well right now i had run about 120 miles only since the car when out of the shop, the car is using Mineral oil 10w 30.
Sorry, well right now i had run about 120 miles only since the car when out of the shop, the car is using Mineral oil 10w 30.
My experience with newly rebuilt motors. They may burn oil for first 500-1000 miles. Mineral oil is good as break-in oil. Filter and oil change at 500 and 1000 miles. Go to good synthetic after second mineral oil change. I like 0W-30 or 5W-30 synthetic. You should not have much oil consumption after 2000 miles on new engine.
I must admit, most of my experiences have been with German motors. BMW and Porsche. A few Honda engines, but no S2000s.
My experience with newly rebuilt motors. They may burn oil for first 500-1000 miles. Mineral oil is good as break-in oil. Filter and oil change at 500 and 1000 miles. Go to good synthetic after second mineral oil change. I like 0W-30 or 5W-30 synthetic. You should not have much oil consumption after 2000 miles on new engine.
I must admit, most of my experiences have been with German motors. BMW and Porsche. A few Honda engines, but no S2000s.
oh i see im glad to hear that. I guess i will need to keep testing and how it goes.
But if the car still has smoking problems what are your thoughts ?
UPDATE
